NEIC; the National Earthquake Information Center
R.P. Masse, R.E. Needham
1989, Earthquakes & Volcanoes (USGS) (21) 4-45
Mexico was hit by one of the most devastating earthquakes in its history on September 19, 1985 at 7:18 a.m. MDT time. this earthquake, which was centered about 380 kilometers west-southwest of Mexico City, had a surface-wave magnitude of 8.1. In less than a minute, seismic waves from this earthquake...
Mount St. Helens and Kilauea volcanoes
J. Barrat
1989, Earthquakes & Volcanoes (USGS) (21) 101-107
From the south, snow-covered Mount St. Helens looms proudly under a fleecy halo of clouds, rivaling the majestic beauty of neighboring Mount Rainer, Mount Hood, and Mount Adams. Salmon fishermen dot the shores of lakes and streams in the mountain's shadow, trucks loaded with fresh-cut timber barrel down backroads, and...
Earthquakes; May-June, July-August, September-October 1989
W. J. Person
1989, Earthquakes & Volcanoes (USGS) (21) 155-165
The first great earthquake (8.0 or above) to occur since 1986 struck in this period in the Macquarie Island region, a very sparsely populated area. In the United States a strong earthquake hit Hawaii on June 26 injuring five people and causing considerable damage....
Earthquakes, March-April 1989
W. J. Person
1989, Earthquakes & Volcanoes (USGS) (21) 128-131
The first major earthquake (7.0-7.9) of the year hit Mexico on April 25, killing three people and causing some damage. Earthquake-related deaths were also reported from Malawi, China, and New Britain. In the United States minor damage was reported from both central and southern California and from Puerto Rico. ...
Origin of the name for the San Andreas Fault
E. H. Pampeyan
1989, Earthquakes & Volcanoes (USGS) (21) 123-124
Triumph of the Voyager mission
R. A. Kerr
1989, Earthquakes & Volcanoes (USGS) (21) 147-149
It had been a long, productive trip. Launched in 1977, the two Voyager spacecraft had visited three giant planets, a dozen major Moons, three ring systems with thousands of rings composed of a myriad of tiny Moonlets. The spacecraft had returned 5 trillion bits of data and over 100,000 photographs....
Earthquakes, January-February 1989
W. J. Person
1989, Earthquakes & Volcanoes (USGS) (21) 125-127
there were no major earthquakes (7.0-7.9) during the first 2 months of the year. the USSR was the only country reporting earthquake-related deaths during this period. In the United States a magnitude 5.0 earthquake in southern California on Januray 19 caused several injuries and minor damage. ...
California’s potential volcanic hazards
P. Jorgenson
1989, Earthquakes & Volcanoes (USGS) (21) 96-100
Although volcanic eruptions have occurred infrequently in California during the last few thousand years, the potential danger to life and property from volcanoes in the state is great enough to be of concern, according to a recent U.S Geological Survey (USGS) publication. the 17-page bulletin, "Potential Hazards from Future Volcanic...
New fault picture points toward San Francisco Bay area earthquakes
R. A. Kerr
1989, Earthquakes & Volcanoes (USGS) (21) 116-120
Recent earthquakes and a new way of looking at faults suggest that damaging earthquakes are closing in on the San Francisco area. Earthquakes Awareness Week 1989 in northern California started off with a bang on Monday, 3 April, when a magnitude 4.8 earthquake struck 15 kilometers northeast of San Jose....
Earthquakes, September-October 1988
W. J. Person
1989, Earthquakes & Volcanoes (USGS) (21) 85-88
There were no major earthquakes (7.0-7.9) during this reporting period. Earthquake-related deaths were reported from Czechoslovakia and injuries were reported from Algeria and Greece. In the United States a sharp earthquake occurred in eastern Kentucky, causing some minro damage. ...
The Moon; twenty years later
R. A. Kerr
1989, Earthquakes & Volcanoes (USGS) (21) 145-146
The 20th anniversary of the first landing on the Moon occurred on July 21, 1989. The vast majority of the Moon rocks collected by the Apollo mission astronauts await further study in the continuing effort to unravel the origin and evolution of Earth's nearest neighbor. Not that the 382-kilogram treasure...
Answers from deep inside the Earth; Continental Scientific Drilling at Cajon Pass, California
D. P. Russ
1989, Earthquakes & Volcanoes (USGS) (21) 79-84
Drilling of a 12,000-foot-deep scientific well has been completed at Cajon Pass in southern California to measure crustal properties, to determine crustal structure, and to better understanding the generation of earthquakes along the San Andreas fault. A joint effort of the National Science Foundation (NFS) and the U.S Geological Survey...
The Southern California Earthquake Survival Program
J.M. Harris
1989, Earthquakes & Volcanoes (USGS) (21) 121-122
In July 1988, the Los Angeles County Board of Supervisors directed the Chief Administrative Office to develop an educational program aimed at improving earthquake preparedness among Los Angeles County residents. the board recognized that current earthquake education efforts were not only insufficient, but also often confusing and costly. The board...
Evaluating the intensity of United States earthquakes
C. W. Stover
1989, Earthquakes & Volcanoes (USGS) (21) 45-53
Measuring the size of an earthquake
W. Spence, S.A. Sipkin, G. L. Choy
1989, Earthquakes & Volcanoes (USGS) (21) 58-63
Earthquakes range broadly in size. A rock-burst in an Idaho silver mine may involve the fracture of 1 meter of rock; the 1965 Rat Island earthquake in the Aleutian arc involved a 650-kilometer length of the Earth's crust. Earthquakes can be even smaller and even larger. If an earthquake is...
Taking the pulse of the San Andreas Fault
R. A. Kerr
1989, Earthquakes & Volcanoes (USGS) (21) 112-115
The ninth of January, 1989, was the 32nd anniversary of the great southern California earthquake of 1857. the latest research shows that, on average, at least part of the section of the San Andreas fault that broke then should break again this year. But the same research suggests that the fault's...
Notes about the Armenia earthquake, 7 December 1988
R. A. Kerr
1989, Earthquakes & Volcanoes (USGS) (21) 68-78
The Earth's crust is a jigsaw of rigid plates like huge paving stones. According to the theory of plate tectonics, these lithosphere plates are constantly in motion, slowly realigning themselves with the passage of time. Ninety to niety-five percent of all earthquakes occur where the plates collide with each other. In...
Smithsonian traveling exhibition highlights two active volcanoes
L. Hill, T. Harney
1989, Earthquakes & Volcanoes (USGS) (21) 108-111
Over time, active volcanoes have captured human fascination, not only because of their strange and dramatic beauty, but also because of their power to destroy. Two active U.S volcanoes-one on the Big Island of Hawaii, the other part of the Cascade Range in the Pacific Northwest-will be the focus of...
Paleomagnetism and tectonic rotation of the lower Miocene Peach Springs Tuff: Colorado Plateau, Arizona, to Barstow, California
Ray E. Wells, John W. Hillhouse
1989, GSA Bulletin (101) 846-863
We have determined remanent magnetization directions of the lower Miocene Peach Springs Tuff at 41 localities in western Arizona and southeastern California. An unusual northeast and shallow magnetization direction confirms the proposed geologic correlation of isolated outcrops of the tuff from the Colorado Plateau to Barstow, California, a distance of...
Paleomagnetic study of the Eastern Klamath terrane, California, and implications for the tectonic history of the Klamath Mountains Province
Edward A. Mankinen, William P. Irwin, C. Sherman Gromme
1989, Journal of Geophysical Research B: Solid Earth (94) 10444-10472
Paleomagnetic study of Permian through Jurassic volcanic and sedimentary strata of the Eastern Klamath terrane has shown the remanent magnetization of many of these rocks to be prefolding and most likely primary. Similarities in magnetic declinations recorded by coeval strata over a broad area are consistent with the hypothesis that...
Mechanisms of Cenozoic tectonic rotation, Pacific Northwest Convergent Margin, U.S.A.
Ray E. Wells
1989, Book chapter, Paleomagnetic rotations and continental deformation. NATO ASI Series (C: Mathematical and Physical Sciences)
Large clockwise rotations (15–80°) are characteristic of Cenozoic volcanic and sedimentary rocks along the convergent margin of the northwestern United States. Abundant paleomagnetic data from 62–12 m.y. old rocks in forearc, arc, and backarc regions show that rotation increases with age and with proximity to the coast. Paleomagnetic and structural...
Correlation of Miocene flows of the Columbia River Basalt Group from the central Columbia River Plateau to the coast of Oregon and Washington
Ray E. Wells, R.W. Simpson, R. D. Bentley, Melvin H. Beeson, Margaret T. Mangan, Thomas L. Wright
1989, Book chapter, Volcanism and Tectonism in the Columbia River Flood-Basalt Province, Geological Society of America Special Paper 239
Nearly twenty flows of the Columbia River Basalt Group (CRBG) can be paleomagnetically and chemically correlated westward as far as 500 km from the Columbia Plateau in Washington, through the Columbia Gorge, to the Coast Range of Oregon and Washington. In the Coast Range near Cathlamet, Washington, the CRBG flow...
Nest habitat use of Rio Grande wild turkeys
Joel A. Schmutz, Clait E. Braun, William F. Andelt
1989, The Wilson Bulletin (101) 591-598
Nest habitat use of Rio Grande Wild Turkeys (Meleagris gallopavo intermedia) was studied along the South Platte River in northeast Colorado in 1986-87. Thirty-three of 35 nests were in riparian habitats. Nests were either in western snowberry (Symphoricarpos occidentalis) (67%) or mixed forbs and grasses (33%). Early season nests were...
Oligocene and Miocene paleogeography of central California and displacement along the San Andreas fault
S.A. Graham, Richard G. Stanley, J. V. Bent, J. B. Carter
1989, GSA Bulletin (101) 711-730
Recently completed sedimentologic and petrologic studies of Oligocene and Miocene strata in the Temblor Range (San Joaquin basin) and Santa Cruz Mountains (La Honda basin) permit detailed reconstructions of paleogeography, as well as new estimates of displacement along the San Andreas fault. During the Oligocene and Miocene, the San Joaquin...
Depositional aspects and a guide to Paleocene coal-bearing sequences, Powder River Basin
Romeo M. Flores, Peter D. Warwick, Timothy A. Moore
Romeo M. Flores, Peter D. Warwick, Timothy A. Moore, Gary Glass, Archie Smith, Douglas J. Nichols, Jack A. Wolfe, Ronald W. Stanton, Jean Weaver, editor(s)
1989, Conference Paper, Tertiary and Cretaceous coals in the Rocky Mountains region: Casper, Wyoming to Salt Lake City, Utah June 29-July 8, 1989
The Paleocene coal-bearing sequences in the northern Powder River Basin are contained in the Tongue River Member of the Fort Union Formation and include anomalously thick (54 m) subbituminous coals. These thick coals have been the target of exploration and development for the past few decades. For the past decade,...
