| Abstract: | A three-dimensional finite-difference simulation of a moderate-sized (M 6.5) thrust-faulting earthquake on the Seattle fault demonstrates the effects of the Seattle Basin on strong ground motion in the Puget lowland. The model area includes the cities of Seattle, Bremerton and Bellevue. We use a recently developed detailed 3D-velocity model of the Seattle Basin in these simulations. The model extended to 20-km depth and assumed rupture on a finite fault with random slip distribution. Preliminary results from simulations of frequencies 0.5 Hz and lower suggest amplification can occur at the surface of the Seattle Basin by the trapping of energy in the Quaternary sediments. Surface waves generated within the basin appear to contribute to amplification throughout the modeled region. Several factors apparently contribute to large ground motions in downtown Seattle: (1) radiation pattern and directivity from the rupture; (2) amplification and energy trapping within the Quaternary sediments; and (3) basin geometry and variation in depth of both Quaternary and Tertiary sediments |
| Genre: | USGS Numbered Series |
| ProdID: | 24610 |
| Citation Author: | Stephenson, William J.; Frankel, Arthur D. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | - |
| Citation Editor: | |
| Citation End Page: | |
| Citation Issue: | |
| Citation Keywords: | |
| Citation Language: | ENGLISH |
| Citation Larger Work Title: | |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | Y |
| Citation Number Of Pages: | |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | NA |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | U.S. Dept. of the Interior, U.S. Geological Survey, |
| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 2000-339 |
| Citation Search Results Text: | Preliminary simulation of a M6.5 earthquake on the Seattle Fault using 3D finite-difference modeling; 2000; OFR; 2000-339; Stephenson, William J.; Frankel, Arthur D. |
| Citation Start Page: | |
| Citation Volume: | |
| Citation Year: | 2000 |
| Type: | citation/reference |
| Text: | Preliminary simulation of a M6.5 earthquake on the Seattle Fault using 3D finite-difference modeling; 2000; OFR; 2000-339; Stephenson, William J.; Frankel, Arthur D. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| URL (INDEX PAGE): | http://pubs.usgs.gov/of/2000/ofr-00-0339/ |
| Date Other: | Sat, 1 Dec 2001 00:00 -0600 |
| Publisher: | U.S. Dept. of the Interior, U.S. Geological Survey, |
