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Aftershocks of the 8 July, 1975 Canal de las Ballenas, Gulf of California, Earthquake
Author(s) -
Munguia Luis,
Reichle Michael,
Reyes Alfonso,
Simons Richard,
Brune James
Publication year - 1977
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl004i011p00507
Subject(s) - aftershock , geology , seismology , fault plane , seismic moment , fault (geology) , seismic zone , slip (aerodynamics) , north american plate , geodesy , induced seismicity , plate tectonics , tectonics , physics , thermodynamics
A M s = 6.5 earthquake occurred on 8 July, 1975 in the northern part of the Gulf of California. The calculated seismic moment is 2 × 10 25 dyne‐cm. This event occurred in a region of particular interest since the position of the transform fault in this region was not well known and had been locked for at least 20 years. Over 180 aftershocks were located along a zone 54 Km long, 10 Km wide and 10‐15 Km deep running between Baja California and Isla Angel de la Guarda. The depth of the aftershock zone is somewhat greater than that found in previous studies in the Gulf. The aftershock trend and that of the fault plane solution is consistent with an event occurring along a vertical strike‐slip fault with motion in the direction of known regional plate movement.