Immediate foreshocks: time variation of the b-value

Details Immediate foreshocks: time variation of the b-value Immediate foreshocks: time variation of the b-value

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pepi..111..229m&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 111, Issue 3-4, p. 229-240.

Physics

11

Scientific paper

We compare b-values in the frequency-magnitude law for the foreshocks and long-term seismicity. Foreshocks are considered in two non-overlapping time intervals, preceding a main shock: (i) last hours; (ii) last days. Statistical analysis of the regional and global earthquake catalogs shows, that in either of these intervals b-value drops by a half, compared to long-term seismicity. This extends the previous results by Molchan and Dmitrieva [Molchan, G., Dmitrieva, O., 1990. Dynamics of the magnitude-frequency relation for foreshocks. Phys. Earth Planet. Inter. 61, 99-112], who have found such a drop a few hours before a mainshock. Our results concern a statistical regularity, not necessarily seen for each individual sequence of foreshocks.

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