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Enigma of earthquakes at ridge‐transform‐fault plate boundaries distribution of non‐double couple parameter of Harvard CMT Solutions
Author(s) -
Kawakatsu Hitoshi
Publication year - 1991
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 - 10.1029/91gl01238
Subject(s) - transform fault , seismology , ridge , geology , fault (geology) , slip (aerodynamics) , sequence (biology) , waveform , paleontology , physics , genetics , biology , thermodynamics , quantum mechanics , voltage
The distribution of the non‐double couple parameter of shallow earthquakes reported in the Harvard CMT catalogue shows systematic characteristics depending on the epicentral locations and types of fault mechanisms. We suggest that they can be explained by the presence of subevents with different double couple mechanisms in a single rupture sequence. The earthquakes at the ridge‐transform‐fault plate boundaries show a particularly interesting pattern. It is suggested that two types of faulting expected in the area (i.e., normal faults at ridges and strike slip faults at transform‐faults) tend to occur almost simultaneously, although this hypothesis needs to be delineated by careful analyses using bodywave waveforms.