The focus of the 1906 California earthquake
- 1 February 1968
- journal article
- Published by Seismological Society of America (SSA) in Bulletin of the Seismological Society of America
- Vol. 58 (1) , 457-471
- https://doi.org/10.1785/bssa0580010457
Abstract
The location of the 1906 California earthquake is reexamined using both the P and S recordings at teleseismic distances and the local observations. Analysis of the observed travel times using modern empirical tables rules out a focus of the principal shock south of the Santa Cruz Mountains or north of Point Arena. By inter-comparison with the measurements from the 1957 San Francisco earthquake, it is demonstrated that the lines of evidence are slightly more favorable to a principal focus near that of the 1957 California shock (37°40′N, 122°29′W) with t0 = 13h12m21s than to Reid's focus near Olema, although the latter is not precluded. There is no evidence from the travel times against the hypothesis that the first rupture was associated with the San Andreas fault and occurred within the crust. The analysis confirms that the rupture was of the (perhaps unusual) bilateral type. Calculations which confirm the contentious magnitude of are set down.
Keywords
This publication has 4 references indexed in Scilit:
- A statistical discussion of P residuals from explosionsBulletin of the Seismological Society of America, 1967
- SAN ANDREAS FAULT NORTH OF POINT ARENA, CALIFORNIAGSA Bulletin, 1967
- Earthquakes and faultsBulletin of the Seismological Society of America, 1963
- The Revision of Earthquake Epicentres, Focal Depths and Origin-Times using a High-Speed ComputerGeophysical Journal International, 1960