Proceedings of Workshop XIX; Active tectonic and magmatic processes beneath Long Valley Caldera, eastern California; Volumes I and II

Hill, D. P.; Bailey, Roger C.; Ryall, Alan

doi:10.3133/ofr84939

Cited by 4 publications

(1 citation statement)

References 114 publications

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“…These observations are used by seismologists to elucidate dynamic characteristics of the faulting process, but also by engineers to understand the dynamic responses of both geologic and engineering structures; in many cases, the same record has served both purposes. Since NEHRP has been in place, several significant strong-motion-data sets have been collected in California alone, including those for the earthquakes of Santa Barbara (1978), Coyote Lake (1979), Imperial Valley (1979), Livermore Valley (1980), Mammoth Lakes (1980), Coalinga (1983, and Morgan Hill (1984). Certainly, the NEHRPfunded strong motion program of the USGS has figured prominently in the collection, processing, and analysis of these observations-but by no means exclusively.…”

Section: Earthquake Studies and Nehrpmentioning

confidence: 99%

The National Earthquake Hazards Reduction Program; scientific status

Hanks¹

1985

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The main fault scarp of the M = 7.0 Borah Peak, Idaho, earthquake of October 28, 1983 (view is to the east, from a point just north of Doublespring Pass Road). The Lost River Range, in the background, rises to Borah Peak (elevation 12,655 ft), the highest point in Idaho, just to the right of the field of view. Over millions of years, the range has been uplifted to its present elevation and backtilted to the east along west-facing normal faults, such as the one which produced the scarp pictured here. The scarp cuts an alluvial fan of Pinedale age (12,000 to 15,000 years old). The beveled surface that intersects the 1983 scarp surface from above was, prior to the 1983 earthquake, the degraded fault scarp of a single earthquake that occurred several thousand years ago. Subsurface expression of this prehistoric earthquake was studied in detail on the walls of a trench excavated in 1976. This trench, located by the slightly darker and more erodable backfill material in the scarp face near the right margin of the cover, was displaced during the 1983 earthquake.

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Section: Earthquake Studies and Nehrpmentioning

confidence: 99%

The National Earthquake Hazards Reduction Program; scientific status

Hanks¹

1985

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Occurrence of anomalous seismic activity preceding large to great earthquakes in northeast India region with special reference to 6 August 1988

Singh¹,

Shanker²,

Singh³

2005

Physics of the Earth and Planetary Interiors

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Observation of shear wave splitting from natural events: South Moat of Long Valley Caldera, California, June 29 to August 12, 1982

Shih¹,

Meyer²

1990

J. Geophys. Res.

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Three‐component seismograms from local earthquakes recorded by three University of Wisconsin stations in the south moat of Long Valley caldera in 1982 have been analyzed for shear wave splitting. The average polarization direction of the first‐arriving shear waves observed at the two stations south of the resurgent dome is NNW–SSE. Time delays between the fast and slow shear waves are proportional to hypocentral distances, and the maximum velocity anisotropy inferred is 6.4%. The average shear wave polarization observed at the station above the resurgent dome is north‐south. The time delays there are not a function of hypocentral distance, and the normalized time delays (ms/km) from events at the southwest boundary of the caldera are larger than those at other azimuths, indicating maximum 9.6% velocity anisotropy. The east‐west to ENE‐WSW variation of the tensional stress fields implied by the shear wave polarizations indicates the interaction between the inflating caldera and the Sierra Nevada range‐front faults under the generally WNW–ESE tension expected from the regional tectonics.

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Proceedings of Workshop XIX; Active tectonic and magmatic processes beneath Long Valley Caldera, eastern California; Volumes I and II

Cited by 4 publications

References 114 publications

The National Earthquake Hazards Reduction Program; scientific status

The National Earthquake Hazards Reduction Program; scientific status

Occurrence of anomalous seismic activity preceding large to great earthquakes in northeast India region with special reference to 6 August 1988

Observation of shear wave splitting from natural events: South Moat of Long Valley Caldera, California, June 29 to August 12, 1982

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