Earthquake and nuclear explosion location using the global seismic network

Thesis/Dissertation · Sat Jan 01 00:00:00 EST 1983

OSTI ID:5984656

Lopez, L M

The relocation of nuclear explosions, aftershock sequence and regional seismicity is addressed by using joint hypocenter determination, Lomnitz' distance domain location, and origin time and earthquake depth determination with local observations. Distance domain and joint hypocenter location are used for a stepwise relocation of nuclear explosions in the USSR. The resulting origin times are 2.5 seconds earlier than those obtained by ISC. Local travel times from the relocated explosions are compared to Jeffreys-Bullen tables. P times are found to be faster at 9-30/sup 0/ distances, the largest deviation being around 10 seconds at 13-18/sup 0/. At these distances S travel times also are faster by approximately 20 seconds. The 1977 Sumba earthquake sequence is relocated by iterative joint hypocenter determination of events with most station reports. Simultaneously determined station corrections are utilized for the relocation of smaller aftershocks. The relocated hypocenters indicate that the aftershocks were initially concentrated along the deep trench. Origin times and depths are recalculated for intermediate depth and deep earthquakes using local observations in and around the Japanese Islands. It is found that origin time and depth differ systematically from ISC values for intermediate depth events. Origin times obtained for events below the crust down to 100 km depth are earlier, whereas no general bias seem to exist for origin times of events in the 100-400 km depth range. The recalculated depths for earthquakes shallower than 100 km are shallower than ISC depths. The depth estimates for earthquakes deeper than 100 km were increased by the recalculations.

• Research Organization: Texas Univ., Dallas (USA)
• OSTI ID: 5984656
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
58 GEOSCIENCES
EARTHQUAKES
SEISMIC DETECTION
NUCLEAR EXPLOSION DETECTION
USSR
NUCLEAR EXPLOSIONS
SEISMIC P WAVES
SEISMIC S WAVES
UNDERGROUND EXPLOSIONS
ASIA
DETECTION
EASTERN EUROPE
EUROPE
EXPLOSIONS
SEISMIC EVENTS
SEISMIC WAVES
450300* - Military Technology
Weaponry
& National Defense- Nuclear Explosion Detection
580201 - Geophysics- Seismology & Tectonics- (1980-1989)