Using group velocities of seismic phases for regional event discrimination

Details Using group velocities of seismic phases for regional event discrimination Using group velocities of seismic phases for regional event discrimination

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pepi..113..155p&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 113, Issue 1-4, p. 155-159.

Physics

Scientific paper

We examined over the Israel Seismic Network (ISN) the seismogram envelopes vs. group velocity V=R/T, where R is the epicenter distance and T the travel time, and found out a persistent difference between quarry blasts and earthquakes. The data include 53 seismic events occurring in northern Israel with magnitudes of ML=1.0-2.6 and at distances of 15-310 km. Within the 1-4 km/s range we measured the velocity Vms at which the envelope reaches its maximum for each ISN station. A simple linear discrimination function c=b+0.33a, based on an empirical relationship between the Vms and R: Vms=a+b ln(R) provides effective separation between the regional earthquakes and explosions. These results are attributed to different excitation of regional surface waves from these two types of seismic events.

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