Slow initial phase of the P‐wave velocity pulse generated by microearthquakes
- 3 March 1992
- journal article
- Published by American Geophysical Union (AGU) in Geophysical Research Letters
- Vol. 19 (5) , 477-480
- https://doi.org/10.1029/92gl00179
Abstract
It was found that the initial rise of the far‐field P‐wave velocity pulse generated by microearthquakes does not act as a ramp but gradually increases according to the function tn (2<n<4), where t is the time measured from the onset. This slow rise of the P‐wave velocity pulse was termed the slow initial phase. The slow initial phase can not be explained by theoretical source models which assume a constant kinematic friction and a constant rupture velocity but by models which predict slow slip velocities and/or rupture velocities immediately after the rupture is initiated, such as the slip‐weakening crack model.This publication has 4 references indexed in Scilit:
- Dynamics of an expanding circular faultBulletin of the Seismological Society of America, 1976
- Anelastic degradation of acoustic pulses in rockPhysics of the Earth and Planetary Interiors, 1974
- Body wave spectra from propagating shear cracks.Journal of Physics of the Earth, 1973
- Cohesive force across the tip of a longitudinal-shear crack and Griffith's specific surface energyJournal of Geophysical Research, 1972