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USGS Tsunami Source Working Group (TSWG)

Program and Abstracts of the Second Tsunami Source Workshop: July 19–20, 2010

Compiled by W.H.K. Lee, S.H. Kirby, and M.F. Diggles

Introduction In response to a request by the National Oceanic and Atmospheric Administration (NOAA) for computing tsunami propagations in the western Pacific, Eric Geist asked Willie Lee for assistance in providing parameters of earthquakes which may be future tsunami sources. The U.S. Geological Survey (USGS) Tsunami Source Working Group (TSWG) was initiated in August 2005. An ad hoc group of diverse expertise was formed, with Steve Kirby as the leader. The founding members are: Rick Blakely, Eric Geist, Steve Kirby, Willie Lee, George Plafker, Dave Scholl, Roland von Huene, and Ray Wells. Half of the founding members are USGS emeritus scientists. A report was quickly completed because of NOAA’s urgent need to precalculate tsunami propagation paths for early warning purposes. It was clear to the group that much more work needed to be done to improve our knowledge about tsunami sources worldwide. The group therefore started an informal research program on tsunami sources and meets irregularly to share ideas, data, and results. Because our group activities are open to anyone, we have more participants now, including, for example, Harley Benz and George Choy (USGS, Golden, Colo.), Holly Ryan and Stephanie Ross (USGS, Menlo Park, Calif.), Hiroo Kanamori (Caltech), Emile Okal (Northwestern University), and Gerard Fryer and Barry Hirshorn (Pacific Tsunami Warning Center, Hawaii). To celebrate the fifth anniversary of the TSWG, a workshop is being held in the Auditorium of Building 3, USGS, Menlo Park, on July 19–20, 2010 (Willie Lee and Steve Kirby, Conveners). All talks (except one) will be video broadcast. The first tsunami source workshop was held in April 2006 with about 100 participants from many institutions. This second workshop (on a much smaller scale) will be devoted primarily to recent work by the USGS members. In addition, Hiroo Kanamori (Caltech) will present his recent work on the 1960 and 2010 Chile earthquakes, Barry Hirshorn and Stuart Weinstein (Pacific Tsunami Warning Center) will present their work on tsunami warning, and Rick Wilson (California Geological Survey) will display three posters on tsunami studies by him and his colleagues.

Last modified August 20, 2010 First posted July 15, 2010 Report PDF (1.5 MB) Presentations folder. This folder contains the presentations that were given at the Workshop as described in the Report linked above (26 files; 280 MB total). This report is available only on the Web. For additional information: Contact Information, Earthquake Science Center, Menlo Park Science Center U.S. Geological Survey 345 Middlefield Road, MS 977 Menlo Park, California 94025 http://earthquake.usgs.gov/ This report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.

Suggested citation:

Lee, W.H.K., Kirby, S.H., and Diggles, M.F., compilers, 2010, Program and abstracts of the Second Tsunami Source Workshop; July 19-20, 2010: U.S. Geological Survey Open-File Report 2010-1152, 33 p.

Contents

Introduction, by W.H.K. Lee, S.H. Kirby, and M.F. Diggles

Scientific Program for the Second Tsunami Source Workshop

List of Participants in the 2nd Tsunami Source Workshop, July 19-20, 2010

Abstracts for The Second Tsunami Source Workshop

1. Comparing the Contrasting Rock Frameworks of the Sumatra and South-Central Chile Convergent Margins—Insights Gained About the Sediment Subduction Setting of Great and Giant Megathrust Ruptures, by David W. Scholl

2. The 2010 Great Chilean Earthquake and Modern Geophysical Data, by Roland von Huene

3. Revisiting the 1960 Chilean Earthquake, by Hiroo Kanamori

4. Selecting a Scientifically Defensible Aleutian Megathrust Rupture for the Multi-Hazards Demonstration Project Tsunami Scenario, by Holly Ryan and the Tsunami Source Working Group

5. Forearc Geology from Free-Air Gravity—Implications for Coseismic Slip During the 2010, 1985, and 1960 Chile Earthquakes, by Richard Blakely, Ray Wells, and Katie Keranen

6. Tsunami Edge Waves in Relation to the 2010 Chile Earthquake, by Eric Geist

7. Earthquake Source Characterization for Tsunami Warning, by Barry F Hirshorn and Stuart Weinstein

8. Tsunami Probability in the Caribbean Region, by Tom Parsons and Eric L. Geist

9. Large Off-trench Earthquakes and Their Tsunami Potentials, by Stephen Kirby, Jakob Wartman, and George Choy

10. Reliable Earthquake Location Using Grid-Search and Simplex Algorithm, by W.H.K. Lee

11. Anomalous E_s/M_o Earthquakes: Trends and Exceptions to the Trends, by George L. Choy and Stephen H. Kirby

12. The USGS Seismic Data Library in Menlo Park, by Willie Lee and Steve Walter

13. Comparisons of Near-Field Tsunami Characteristics of Giant (M>9) Earthquakes in Chile (1960), Alaska (1964), and Sumatra (2004), by George Plafker and J.C. Savage

14. Development Of New Databases For Tsunami Hazard Analysis In California, by Rick I. Wilson, Aggeliki Barberopoulou, Jose C. Borrero, William A. Bryant, Lori A. Dengler, James D. Goltz, Mark R. Legg, Terilee McGuire, Kevin M. Miller, Charles R. Real, Costas E. Synolakis, and Burak Uslu

15. New Maximum Tsunami Inundation Maps for Use by Local Emergency Planners in the State of California, USA, by Rick I. Wilson, Aggeliki Barberopoulou, Kevin M. Miller, Jim D. Goltz, and Costas E. Synolakis

16. The 2010 Chilean Tsunami on the California Coastline, by Rick I. Wilson, Lori A. Dengler, Mark R. Legg, Kate Long, and Kevin M. Miller

Posters

Willie Lee and Steve Walter (USGS): The USGS Seismic Data Library in Menlo Park

George Plafker and J. C. Savage (USGS): Comparisons of Near-Field Tsunami Characteristics of Giant (M>9) Earthquakes in Chile (1960), Alaska (1964), and Sumatra (2004)

Rick Wilson (CGS) and others: Development of new databases for tsunami hazard analysis in California

Rick Wilson (CGS) and others: New maximum tsunami inundation maps for use by local emergency planners in the State of California, USA

Rick Wilson (CGS) and others: The 2010 Chilean tsunami on the California coastline

Aurélie Guilhem and Doug Dreger (U.C. Berkeley): Towards a realtime earthquake source determination and tsunami early warning in Northern California

Ray Wells, Rick Blakely, and Dave Scholl, (USGS): Subduction zone structure revealed by free-air gravity and its relation to slip in great earthquakes - evidence from recent events

Seismicity of the Earth 1900-2007, U.S. Geological Survey Scientific Investigations Map 3064, 2010 (link)