Preliminary isoseismal map and intensity distribution for the Borah Peak, Idaho, earthquake of October 28, 1983

Stover, C.W.

doi:10.3133/ofr84297

Cited by 4 publications

(2 citation statements)

References 1 publication

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“…One method of checking for such an underestimate is to consider the distribution of the isoseismals. The isoseismals determined by Stover [ , 1984 for the Coalinga and Borah Peak earthquakes are plotted in Figure 11. The isoseismals which bound the area of intensity V for the Coalinga earthquake are approximately symmetric around the epicenter.…”

Section: Source Directivitymentioning

confidence: 99%

Teleseismic estimates of the energy radiated by shallow earthquakes

Boatwright¹,

Choy²

1986

J. Geophys. Res.

223

146

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The energy flux contained in the P‐wave groups (P + pP + sP) or the S‐wave groups (S + pS + sS) radiated by a shallow earthquake is modeled assuming that the energy flux in the direct and depth phases adds incoherently. By defining generalized radiation patterns which incorporate this neutral interference, the wave groups are analyzed as though they were comprised of a single phase. Measurements of the energy flux in the wave groups are corrected in the frequency domain for both the body‐wave attenuation and the frequency band of the recording. The corrected measurements are then used to estimate the seismic energy radiated by the earthquake. This analysis is applied to digital recordings of the teleseismic wave groups radiated by the May 2, 1983, Coalinga, California, earthquake and the October 28, 1983, Borah Peak, Idaho, earthquake. For the Coalinga earthquake, an estimate of Es = 1.6 ± 0.4×1021 dyn cm was determined from six P‐wave groups, while the SH wave group recorded at station COL returned an estimate of Es = 1.2×1021 dyn cm. For the Borah Peak earthquake, an estimate ofEs = 3.2 ± 0.5×1021 dyn cm was determined from seven P‐wave groups. The distribution of the isoseismals for the Borah Peak earthquake indicate that the energy radiated by this event was focussed to the northwest, in the direction of rupture propagation. Correcting the teleseismic estimate for this focussing gives Es = 3.6 ± 0.5×1021 dyn cm. Combining these estimates of the radiated energy with broad‐band estimates of the seismic moment yields estimates of the apparent stress of 17 and 7 bars for the Coalinga and the Borah Peak earthquakes, respectively.

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Section: Source Directivitymentioning

confidence: 99%

Teleseismic estimates of the energy radiated by shallow earthquakes

Boatwright¹,

Choy²

1986

J. Geophys. Res.

223

146

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“…The Borah Peak earthquake was felt over 670,000 km2, reached MMI = VII at the nearby towns of Mackay and Challis (25 km and 65 km distant, respectively, from the main-shock epicenter), caused two deaths in Challis, and resulted in about $12.5 million of damage (Stover, 1985). The earthquake produced 36 km of surface faulting along the southwestern base of the Lost River Range, re-rupturing parts of the 140-km-long Lost River fault that had last broken about mid-Holoccne time and a branch fault; vertical displacement along the new fault scarps reached a maximum of 2.7 m (0.8 m average), and net slip averaged 0.17 m of sinistral slip for every 1.00 m of dip slip (Crone and Machette, 1984;Crone and others, 1987).…”

Section: Largest Historical Earthquakesmentioning

confidence: 99%

Proceedings of the National Earthquake Prediction Evaluation Council, June 11-12, 1991, Alta, Utah

Frizzell¹

1992

Open-File Report

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Morning Session T.McEVILLY, Chairman of the National Earthquake Prediction Evaluation Council (NEPEC) , opened the Council meeting by asking members, participants, and guests, to introduce themselves and by outlining the meeting's agenda (see Appendices A and B) . All Members were in attendance except K. Aki, J. Davis, and R. Weldon. R.WESSON, Vice-Chairman of NEPEC, presented an overview of Council activities with an emphasis on the transition from the Chairmanship of Lynn Sykes to that of McEvilly.At the termination of Sykes 1 tenure, NEPEC had completed a probabilistic assessment of the San Francisco Bay Region and had visited a number of areas of the country (Northern California, Southern California, the Pacific Northwest, and Alaska) that had been perceived as having a level of hazard that warranted attention. NEPEC had intended to visit the Wasatch area, but the press of business in California precluded such a visit.

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Seismicity of the Intermountain Seismic Belt

Smith¹,

Arabasz²

Neotectonics of North America

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Preliminary isoseismal map and intensity distribution for the Borah Peak, Idaho, earthquake of October 28, 1983

Cited by 4 publications

References 1 publication

Teleseismic estimates of the energy radiated by shallow earthquakes

Teleseismic estimates of the energy radiated by shallow earthquakes

Proceedings of the National Earthquake Prediction Evaluation Council, June 11-12, 1991, Alta, Utah

Seismicity of the Intermountain Seismic Belt

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