Application of two-dimensional finite-difference wave simulation to earthquakes, earth structure, and seismic hazard

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5334177

Vidale, J E

Schemes to model seismic-wave propagation through laterally varying structures with 2-D numerical algorithms are developed and applied to earthquake and explosion problems. In Chapter 1, 2-D source expressions that have the same radiation patterns as their 3-D counterparts are derived. In Chapter 2, synthetic seismograms are constructed for the strong motions of the 1968 Borrego Mountain earthquake recorded at El Centro. A good fit to the data results from using the laterally varying model determined by a detailed refraction survey and the source parameters determined by teleseismic waveform modeling. Synthetic seismograms calculated for the 1971 San Fernando earthquake show strong effects due to lateral variation in sediment thickness in the San Fernando valley and the Los Angeles basin. In Chapter 3, the effect of shallow station structure and lateral velocity variation are investigated for records of the Amchitka blast Milrow. The differences between various (RDP) source representations are small compared to the differences between using various possible velocity structures. In Chapter 4, synthetic seismograms appropriate for a record section in a plane perpendicular to the strike of the slab are presented using a coupled finite-difference and Kirchhoff method, for a 515-km-deep earthquake.

• Research Organization: California Inst. of Tech., Pasadena (USA)
• OSTI ID: 5334177
• Country of Publication: United States
• Language: English

Related Subjects

45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
450300 -- Military Technology
Weaponry
& National Defense-- Nuclear Explosion Detection
58 GEOSCIENCES
580201* -- Geophysics-- Seismology & Tectonics-- (1980-1989)
DATA ANALYSIS
DETECTION
EARTHQUAKES
FINITE DIFFERENCE METHOD
ITERATIVE METHODS
NUCLEAR EXPLOSION DETECTION
NUMERICAL SOLUTION
SEISMIC DETECTION
SEISMIC EVENTS
SEISMIC WAVES
SIMULATION