INL Seismic Monitoring Annual Report: January 1, 2008 – December 31, 2008

Payne, S. J. ; Carpenter, N. S. ; Hodges, J. M. ; Berg, R. G.

Idaho National Laboratory

关键词: Stresses;    Microearthquakes;    Monitoring;    Snake River Plain;    Moon;   

DOI  :  10.2172/971357
RP-ID  :  INL/EXT-09-16687
RP-ID  :  DE-AC07-05ID14517
RP-ID  :  971357

美国|英语

来源: UNT Digital Library

【 摘 要 】

During 2008, the INL Seismic Monitoring Program evaluated 7,284 earthquakes from around the world, the western United States, and local region of the eastern Snake River Plain. 2,396 earthquakes and man-made blasts were evaluated within the local region outside and within a 161-km (or 100-mile) radius of INL. Of these events, 25 were small to moderate size earthquakes ranging in magnitude from 3.0 to 3.9. 823 earthquakes occurred within the 161-km radius of INL and over 300 events were associated with eight different earthquake swarms which were located in active regions of the Basin and Range Province that surrounds the eastern Snake River Plain. Eight microearthquakes in 2008 of magnitude (M) 2.0 and less were located within the eastern Snake River Plain, seven at or near the Craters of the Moon National Monument and one within the INL boundary. Further analyses of the anomalously deep focal depths (15 to 42 km) and different waveform characteristics of all Craters of the Moon National Monument events (1999-2008) suggest association with magmatic processes. From 1972 to 2008, INL located 36 other small-magnitude microearthquakes (M < 2.0) at depths (< 11 km) within the eastern Snake River Plain and attributes these events to regional tectonic tensional stresses.