Source-mechanism from spectra of long-period seismic surface waves.
- 1 October 1963
- journal article
- Published by Seismological Society of America (SSA) in Bulletin of the Seismological Society of America
- Vol. 53 (5) , 905-919
- https://doi.org/10.1785/bssa0530050905
Abstract
Source-mechanism is derived from amplitude and phase spectra of mantle Love and Rayleigh waves of the Alaska earthquake of July 10, 1958. The signals R2, R3, G2, G4, G5 recorded on the Gilman 80–90 and the Press-Ewing 30–90 seismograph systems at Pasadena, California, are separated, digitized, filtered and Fourier-analyzed. An agreement between theory and observations is obtained for a unilateral fault of 300–350 km, which ruptured with a speed of 3-3.5 km/sec in the direction N40°W. Fault length is in good agreement with the extent of aftershock distribution in the month of July, 1958, and the time of rupture checks with the duration of an impressive T-phase recorded at Hawaii. The phases of the signals are corrected for propagation, instrumental shift and the source finiteness. Initial phases thus obtained agree on a mechanism of a right double-couple with a unit step-function in time.Keywords
This publication has 14 references indexed in Scilit:
- Correction of initial phase measurements for the southeast Alaska earthquake of July 10, 1958, and for certain nuclear explosionsPublished by American Geophysical Union (AGU) ,1962
- Evidence of dispersion in earthquakeTphasesJournal of Geophysical Research, 1962
- Source-mechanism from spectra of long-period seismic surface-waves: 1. The Mongolian earthquake of December 4, 1957Published by American Geophysical Union (AGU) ,1962
- The tsunami of May 23, 1960, on the Island of HawaiiBulletin of the Seismological Society of America, 1961
- The Alaska earthquake of July 10, 1958: IntroductionBulletin of the Seismological Society of America, 1960
- Alaska earthquake of July 10, 1958: Intensity distribution and field investigation of northern epicentral regionBulletin of the Seismological Society of America, 1960
- The Alaska earthquake of July 10, 1958: Seismic studiesBulletin of the Seismological Society of America, 1960
- The Alaska earthquake of July 10, 1958: Movement on the Fairweather fault and field investigation of southern epicentral regionBulletin of the Seismological Society of America, 1960
- Ultra-long-period motions from the Alaska earthquake of July 10, 1958Pure and Applied Geophysics, 1958
- The response of strain and pendulum seismographs to surface waves*Bulletin of the Seismological Society of America, 1952