Pulley Ridge is a chain of drowned barrier islands that extends almost 200 km in 60-90 m water depths (Fig. 1). This drowned ridge is located on the Florida Platform in the southeastern Gulf of Mexico about 250 km west of Cape Sable, Florida (Jarrett and others, 2005). These islands formed during the early Holocene marine transgression approximately 12,000 - 14,000 years before present, and were then submerged by sea level rise and preserved near the outer edge of the Florida Platform. The southern portion of Pulley Ridge is the focus of this study. This area hosts zooxanthellate scleractinian corals, green, red and brown macro algae, and a mix of deep and typically shallow-water tropical fishes. This largely photosynthetic community is unique in that it thrives with less than 5% of the light typically associated with shallow-water reefs with similar fauna.
Several factors help to account for the existence of this unique deep-water community. First, the underlying drowned barrier islands provide both elevated topography and lithified substrate for the establishment of the hardbottom community. Second, the region is commonly bathed by the Loop Current, which brings relatively clear and warm water to this area. Third, the ridge's position on the continental shelf places it within the thermocline which provides nutrients to the reef during upwelling (Halley and others, 2003).
The USGS has made two proposals to resource managers for the designation of marine protected areas based on the geophysical and photographic data in this report. The proposals describe areas that may require some regulatory protection of marine life utilizing the sea floor (Fig. 1).
The first proposal is that the area of greatest hermatypic coral cover (Fig. 1) is considered for future management actions and designated a Habitat Area of Particular Concern (HAPC) by the Gulf of Mexico Fishery Management Council. HAPCs are identified on the basis of habitat level considerations:
The second proposed area is for Coral Essential Fish Habitat (CEFH, Fig. 1). CEFHs are defined as \"those waters and substrate necessary to corals for spawning, breeding, feeding, or growth to maturity.\" The following definitions are provided for clarification:
This report presents the geophysical and photographic data that were collected to describe the surficial and shallow subsurface geologic framework of the area where these deep-water corals are known to occur. The data types include multibeam bathymetry, sidescan-sonar imagery, images of high-resolution seismic-reflection profiles, and bottom photographs. In addition, the tracklines for the seismic data, locations of bottom photographs and camera drifts, and tracklines along which submersible and remotely operated vehicle (ROV) observations were made are contained in the GIS files accompanying this report. Unfortunately, video footage from the camera drifts, submersible, and ROV cruises is not available on this DVD due to the quantity of data. The bottom photograph data set has been previously published (Cross and others, 2004), however it is included in this publication in an effort to integrate the varying data sets in one location. This integration is accomplished through the GIS data included on this DVD.
No abstract available.
","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Earthquake Hazards of the Pacific Northwest Coastal and Marine Regions","largerWorkSubtype":{"id":5,"text":"USGS Numbered Series"},"language":"English","doi":"10.3133/pp1661C","collaboration":"This report is Chapter C of Earthquake Hazards of the Pacific Northwest Coastal and Marine Regions, USGS Professional Paper 1661, edited by Robert Kayen.","usgsCitation":"Fisher, M.A., Hyndman, R.D., Johnson, S.Y., Brocher, T.M., Crosson, R.S., Wells, R., Calvert, A., and ten Brink, U., 2005, Crustal structure and earthquake hazards of the subduction zone in southwestern British Columbia and western Washington (Version 1.0): U.S. Geological Survey Professional Paper 1661, 33 p.; plate 1, 25 x 35 in.; plate 2, 25 x 17 in.; plate 3, 36 x 43 in., https://doi.org/10.3133/pp1661C.","productDescription":"33 p.; plate 1, 25 x 35 in.; plate 2, 25 x 17 in.; plate 3, 36 x 43 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D.","contributorId":26031,"corporation":false,"usgs":true,"family":"Hyndman","given":"Roy","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":287299,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Johnson, Samuel Y. 0000-0001-7972-9977 sjohnson@usgs.gov","orcid":"https://orcid.org/0000-0001-7972-9977","contributorId":2607,"corporation":false,"usgs":true,"family":"Johnson","given":"Samuel","email":"sjohnson@usgs.gov","middleInitial":"Y.","affiliations":[{"id":520,"text":"Pacific Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":true,"id":287297,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Brocher, Thomas M. 0000-0002-9740-839X brocher@usgs.gov","orcid":"https://orcid.org/0000-0002-9740-839X","contributorId":262,"corporation":false,"usgs":true,"family":"Brocher","given":"Thomas","email":"brocher@usgs.gov","middleInitial":"M.","affiliations":[{"id":237,"text":"Earthquake Science Center","active":true,"usgs":true}],"preferred":true,"id":287295,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Crosson, Robert S.","contributorId":29816,"corporation":false,"usgs":true,"family":"Crosson","given":"Robert","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":287300,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Wells, Ray E. 0000-0002-7796-0160 rwells@usgs.gov","orcid":"https://orcid.org/0000-0002-7796-0160","contributorId":2692,"corporation":false,"usgs":true,"family":"Wells","given":"Ray E.","email":"rwells@usgs.gov","affiliations":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"preferred":false,"id":287298,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Calvert, Andrew J.","contributorId":79178,"corporation":false,"usgs":true,"family":"Calvert","given":"Andrew J.","affiliations":[],"preferred":false,"id":287301,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"ten Brink, Uri S. 0000-0001-6858-3001 utenbrink@usgs.gov","orcid":"https://orcid.org/0000-0001-6858-3001","contributorId":127560,"corporation":false,"usgs":true,"family":"ten Brink","given":"Uri S.","email":"utenbrink@usgs.gov","affiliations":[{"id":186,"text":"Coastal and Marine Geology Program","active":true,"usgs":true},{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":false,"id":287302,"contributorType":{"id":1,"text":"Authors"},"rank":8}]}} ,{"id":76519,"text":"wdrOR051 - 2005 - Water resources data for Oregon, water year 2005","interactions":[],"lastModifiedDate":"2012-02-02T00:14:17","indexId":"wdrOR051","displayToPublicDate":"2006-04-08T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":340,"text":"Water Data Report","code":"WDR","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"OR-05-1","title":"Water resources data for Oregon, water year 2005","language":"ENGLISH","doi":"10.3133/wdrOR051","usgsCitation":"Herrett, T.A., Hess, G.W., Stewart, M.A., Ruppert, G.P., and Courts, M., 2005, Water resources data for Oregon, water year 2005 (Online only): U.S. Geological Survey Water Data Report OR-05-1, 971 p.; 1 CD-ROM, https://doi.org/10.3133/wdrOR051.","productDescription":"971 p.; 1 CD-ROM","numberOfPages":"971","onlineOnly":"Y","costCenters":[],"links":[{"id":194626,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"},{"id":7241,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/wdr/2005/wdr-or-05/","linkFileType":{"id":5,"text":"html"}}],"edition":"Online only","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e49f7e4b07f02db5f1fae","contributors":{"authors":[{"text":"Herrett, Thomas A. herrett@usgs.gov","contributorId":3505,"corporation":false,"usgs":true,"family":"Herrett","given":"Thomas","email":"herrett@usgs.gov","middleInitial":"A.","affiliations":[],"preferred":true,"id":287240,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hess, Glen W.","contributorId":19136,"corporation":false,"usgs":true,"family":"Hess","given":"Glen","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":287241,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Stewart, Marc A. 0000-0003-1140-6316 mastewar@usgs.gov","orcid":"https://orcid.org/0000-0003-1140-6316","contributorId":2277,"corporation":false,"usgs":true,"family":"Stewart","given":"Marc","email":"mastewar@usgs.gov","middleInitial":"A.","affiliations":[{"id":518,"text":"Oregon Water Science Center","active":true,"usgs":true}],"preferred":true,"id":287239,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Ruppert, Gregory P.","contributorId":46616,"corporation":false,"usgs":true,"family":"Ruppert","given":"Gregory","email":"","middleInitial":"P.","affiliations":[],"preferred":false,"id":287242,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Courts, Mary-Lorraine","contributorId":104151,"corporation":false,"usgs":true,"family":"Courts","given":"Mary-Lorraine","email":"","affiliations":[],"preferred":false,"id":287243,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":76516,"text":"fs20053103 - 2005 - Host Fish Identification and Early Life Thermal Requirements for the Federal Endangered Winged Mapleleaf Mussel","interactions":[],"lastModifiedDate":"2012-02-02T00:14:15","indexId":"fs20053103","displayToPublicDate":"2006-04-07T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":313,"text":"Fact Sheet","code":"FS","onlineIssn":"2327-6932","printIssn":"2327-6916","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2005-3103","title":"Host Fish Identification and Early Life Thermal Requirements for the Federal Endangered Winged Mapleleaf Mussel","docAbstract":"The winged mapleleaf mussel (Quadrula fragosa, WML) is a Federal endangered species historically inhabiting at least 34 river systems in 12 Midwestern states. Only four populations are currently known to exist, including one confirmed reproducing population in the St. Croix National Scenic Riverway (NSR) bordering Minnesota and Wisconsin. Recovery efforts are limited by a lack of life history information, particularly which species of fish serve as host to the mussel's parasitic larvae (glochidia).\r\n\r\nSince 1997, biologists at the University of Minnesota have tried to identify host fish for the WML. Department of the Interior colleagues working in western Wisconsin at the U.S. Fish and Wildlife Service's La Crosse Fishery Resources Office and Genoa National Fish Hatchery, the National Park Service's St. Croix NSR, and the U.S. Geological Survey's Upper Midwest Environmental Sciences Center (UMESC) in La Crosse joined the team in 2001 to expand and accelerate the laboratory host fish identification program by making use of the well-equipped aquatic research facilities at UMESC. We report on several WML early life history investigations conducted at UMESC since autumn 2003 to identify suitable host fish species and evaluate thermal requisites for the development of glochidia into free-living juvenile mussels.","language":"ENGLISH","publisher":"U.S. Geological Survey","doi":"10.3133/fs20053103","usgsCitation":"Steingraeber, M., and Newton, T.J., 2005, Host Fish Identification and Early Life Thermal Requirements for the Federal Endangered Winged Mapleleaf Mussel: U.S. Geological Survey Fact Sheet 2005-3103, 2 p., https://doi.org/10.3133/fs20053103.","productDescription":"2 p.","numberOfPages":"2","costCenters":[{"id":595,"text":"U.S. Geological Survey","active":false,"usgs":true}],"links":[{"id":121241,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/fs_2005_3103.jpg"},{"id":13243,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://www.umesc.usgs.gov/documents/fact_sheets/winged_mapleleaf_lo_res.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ae0e4b07f02db688118","contributors":{"authors":[{"text":"Steingraeber, Mark","contributorId":64734,"corporation":false,"usgs":true,"family":"Steingraeber","given":"Mark","affiliations":[],"preferred":false,"id":287230,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Newton, Teresa J. 0000-0001-9351-5852 tnewton@usgs.gov","orcid":"https://orcid.org/0000-0001-9351-5852","contributorId":2470,"corporation":false,"usgs":true,"family":"Newton","given":"Teresa","email":"tnewton@usgs.gov","middleInitial":"J.","affiliations":[{"id":606,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":true}],"preferred":false,"id":287229,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":76517,"text":"sim2914 - 2005 - Geohydrology of the Valley-Fill Aquifers between the Village of Greene, Chenango County and Chenango Valley State Park, Broome County, New York","interactions":[],"lastModifiedDate":"2017-04-04T13:49:39","indexId":"sim2914","displayToPublicDate":"2006-04-07T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":333,"text":"Scientific Investigations Map","code":"SIM","onlineIssn":"2329-132X","printIssn":"2329-1311","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2914","title":"Geohydrology of the Valley-Fill Aquifers between the Village of Greene, Chenango County and Chenango Valley State Park, Broome County, New York","docAbstract":"This set of maps and geohydrologic sections depict the geology and hydrology of valley-fill aquifers in the 14-mile reach of the Chenango River valley between the Village of Greene and the area south of Chenango Valley State Park, N.Y. This map report depicts the aquifers; locations of domestic, production, and test wells; surficial geology; water-table altitude; potentiometric-surface altitude; generalized saturated thickness of the unconfined (water-table) aquifer; generalized thickness of the confined aquifer; and includes three geohydrologic sections.
\nThe valley fill in the Chenango River valley consists primarily of (1) glaciofluvial deposits comprised of stratified coarse-grained sediment (sand and gravel) that were deposited by meltwater streams flowing on, below, and in front of the glacier; (2) lacustrine sediments consisting of stratified fine-grained sediment (very fine sand, silt, and clay) that were deposited in proglacial lakes that formed at the front of a glacier; and (3) recent alluvium consisting of alluvial fan deposits (sand, silt, and gravel), floodplain sediments (fine-to-medium sand and silt), and channel deposits (sand and gravel).
\nThe Chenango River valley contains an unconfined valley-fill aquifer throughout much of the study area, and a confined valley-fill aquifer in the area between the northern edge of the Chenango Valley State Park and the Village of Greene. The unconfined aquifer consists predominantly of alluvial and outwash sand and gravel. The water table was mapped using water-level measurements obtained from wells completed in the unconfined aquifer, and from altitudes of lakes, ponds, and streams as indicated on U.S. Geological Survey 1:24,000-scale topographic maps. The depth to the water table typically ranges from 5 to 15 feet below land surface, but can locally be as much as 100 feet, such as in the ice-contact deposits in the Chenango Valley State Park.
\nThe confined aquifer is widely used by people living and working in the Chenango River valley. The confined aquifer consists of ice-contact sand and gravel, typically overlies bedrock, and underlies a confining unit consisting of lacustrine fine sand, silt, and clay. The confining unit is typically more than 100 feet thick in the central parts of the valley between Greene Landing Field and along the northern edge of the Chenango Valley State Park. The thickness of the confined aquifer is more than 40 feet near the Greene Landing Field.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/sim2914","usgsCitation":"Hetcher-Aguila, K.K., and Miller, T.S., 2005, Geohydrology of the Valley-Fill Aquifers between the Village of Greene, Chenango County and Chenango Valley State Park, Broome County, New York: U.S. Geological Survey Scientific Investigations Map 2914, 8 Plates, https://doi.org/10.3133/sim2914.","productDescription":"8 Plates","onlineOnly":"Y","additionalOnlineFiles":"N","costCenters":[{"id":474,"text":"New York Water Science Center","active":true,"usgs":true}],"links":[{"id":323534,"rank":2,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/sim/2914/sim2914_plate1.pdf","text":"Plate 1 - Introduction and location of study area, orig. size 20\"x30\"","size":"736 KB","linkFileType":{"id":1,"text":"pdf"},"description":"SIM 2914"},{"id":323535,"rank":3,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/sim/2914/sim2914_plate2.pdf","text":"Plate 2 - Location of selected wells and test holes, orig. size 36\"x30\"","size":"8.5 KB","linkFileType":{"id":1,"text":"pdf"},"description":"SIM 2914"},{"id":323536,"rank":4,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/sim/2914/sim2914_plate3.pdf","text":"Plate 3 - Surficial geology, orig. size 20\"x30\"","size":"8.2 MB","linkFileType":{"id":1,"text":"pdf"},"description":"SIM 2914"},{"id":323537,"rank":5,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/sim/2914/sim2914_plate4.pdf","text":"Plate 4 - Generalized water-table altitude, orig. size 20\"x30\"","size":"7.9 MB","linkFileType":{"id":1,"text":"pdf"}},{"id":323538,"rank":6,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/sim/2914/sim2914_plate5.pdf","text":"Plate 5 - Generalized potentiometric-surface altitude in the confined aquifer, orig. size 20\"x30\"","size":"7.9 MB","linkFileType":{"id":1,"text":"pdf"},"description":"SIM 2914"},{"id":323539,"rank":7,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/sim/2914/sim2914_plate6.pdf","text":"Plate 6 - Generalized saturated thickness of the unconfined aquifer, orig. size 20\"x30\"","size":"7.9 MB","linkFileType":{"id":1,"text":"pdf"},"description":"SIM 2914"},{"id":323540,"rank":8,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/sim/2914/sim2914_plate7.pdf","text":"Plate 7 - Generalized thickness of the confined aquifer, orig. size 20\"x30\"","size":"7.8 MB","linkFileType":{"id":1,"text":"pdf"},"description":"SIM 2914"},{"id":323541,"rank":9,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/sim/2914/sim2914_plate8.pdf","text":"Plate 8 - Generalized geohydrologic sections, orig. size 30\"x20\"","size":"1.4 MB","linkFileType":{"id":1,"text":"pdf"},"description":"SIM 2914"},{"id":190591,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/sim/2914/coverthb.jpg"},{"id":326258,"rank":10,"type":{"id":20,"text":"Read Me"},"url":"https://pubs.usgs.gov/sim/2914/readme.txt","text":"README.TXT - Important CD-ROM end-user information","size":"3.60 MB","linkFileType":{"id":2,"text":"txt"},"description":"SIM 2914"}],"scale":"24000","contact":"Director, New York Water Science Center
U.S. Geological Survey
425 Jordan Rd
Troy, NY 12180
(518) 285-5695
http://ny.water.usgs.gov/
Landsat represents the world’s longest continuously acquired collection of space-based land remote sensing data. The Landsat Project is a joint initiative of the U.S. Geological Survey (USGS) and the National Aeronautics and Space Administration (NASA) designed to gather Earth resource data from space. NASA developed and launched the spacecrafts, while the USGS handles the operations, maintenance, and management of all ground data reception, processing, archiving, product generation, and distribution.
Landsat satellites have been collecting images of the Earth’s surface for more than thirty years. Landsat’s Global Survey Mission is to repeatedly capture images of the Earth’s land mass, coastal boundaries, and coral reefs, and to ensure that sufficient data are acquired to support the observation of changes on the Earth’s land surface and surrounding environment. NASA launched the first Landsat satellite in 1972, and the most recent one, Landsat 7, in 1999. Landsats 5 and 7 continue to capture hundreds of additional images of the Earth’s surface each day. These images provide a valuable resource for people who work
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/fs20053130","usgsCitation":"Water Resources Division, U.S. Geological Survey, 2005, Landsat: A global land-observing program (Supersedes FS 023-03): U.S. Geological Survey Fact Sheet 2005-3130, 4 p., https://doi.org/10.3133/fs20053130.","productDescription":"4 p.","numberOfPages":"4","costCenters":[{"id":222,"text":"Earth Resources Observation and Science (EROS) Center","active":true,"usgs":true},{"id":595,"text":"U.S. Geological Survey","active":false,"usgs":true}],"links":[{"id":7090,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/fs/2005/3130/FS-2005-3130.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":121345,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/fs_2005_3130.jpg"},{"id":115897,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/fs/2005/3130/","linkFileType":{"id":5,"text":"html"}}],"edition":"Supersedes FS 023-03","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b20e4b07f02db6abb33","contributors":{"authors":[{"text":"Water Resources Division, U.S. Geological Survey","contributorId":128075,"corporation":true,"usgs":false,"organization":"Water Resources Division, U.S. Geological Survey","id":534773,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":76153,"text":"ofr20051312 - 2005 - Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2004","interactions":[],"lastModifiedDate":"2022-12-08T23:12:54.554904","indexId":"ofr20051312","displayToPublicDate":"2006-03-30T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2005-1312","title":"Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2004","docAbstract":"The Alaska Volcano Observatory (AVO), a cooperative program of the U.S. Geological Survey, the Geophysical Institute of the University of Alaska Fairbanks, and the Alaska Division of Geological and Geophysical Surveys, has maintained seismic monitoring networks at historically active volcanoes in Alaska since 1988. The primary objectives of the seismic program are the real-time seismic monitoring of active, potentially hazardous, Alaskan volcanoes and the investigation of seismic processes associated with active volcanism. This catalog presents the calculated earthquake hypocenter and phase arrival data, and changes in the seismic monitoring program for the period January 1 through December 31, 2004.
These include Mount Wrangell, Mount Spurr, Redoubt Volcano, Iliamna Volcano, Augustine Volcano, Katmai volcanic cluster (Snowy Mountain, Mount Griggs, Mount Katmai, Novarupta, Trident Volcano, Mount Mageik, Mount Martin), Mount Peulik, Aniakchak Crater, Mount Veniaminof, Pavlof Volcano, Mount Dutton, Isanotski Peaks, Shishaldin Volcano, Fisher Caldera, Westdahl Peak, Akutan Peak, Makushin Volcano, Okmok Caldera, Great Sitkin Volcano, Kanaga Volcano, Tanaga Volcano, and Mount Gareloi. Over the past year, formal monitoring of Okmok, Tanaga and Gareloi were announced following an extended period of monitoring to determine the background seismicity at each volcanic center. The seismicity at Mount Peulik was still being studied at the end of 2004 and has yet to be added to the list of monitored volcanoes in the AVO weekly update. AVO located 6928 earthquakes in 2004.
Monitoring highlights in 2004 include: (1) an earthquake swarm at Westdahl Peak in January; (2) an increase in seismicity at Mount Spurr starting in February continuing through the end of the year into 2005; (4) low-level tremor, and low-frequency events related to intermittent ash and steam emissions at Mount Veniaminof between April and October; (4) low-level tremor at Shishaldin Volcano between April and October; (5) an earthquake swarm at Akutan in July; and (6) low-level tremor at Okmok Caldera throughout the year (Table 2). Instrumentation and data acquisition highlights in 2004 were the installation of subnetworks on Mount Peulik and Korovin Volcano and the installation of broadband stations to augment the Katmai and Spurr subnetworks.
This catalog includes: (1) a description of instruments deployed in the field and their locations; (2) a description of earthquake detection, recording, analysis, and data archival systems; (3) a description of velocity models used for earthquake locations; (4) a summary of earthquakes located in 2004; and (5) an accompanying UNIX tar-file with a summary of earthquake origin times, hypocenters, magnitudes, phase arrival times, and location quality statistics; daily station usage statistics; and all HYPOELLIPSE files used to determine the earthquake locations in 2004.
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