Stress release during earthquake sequences

Gibowicz, S.

Artykuł - szczegóły

Tytuł artykułu

Stress release during earthquake sequences

Autorzy

Gibowicz S.

Identyfikatory

Warianty tytułu

Języki publikacji

Abstrakty

The average stress drop and apparent stress released during 65 complex earthquake sequences from all over the world are estimated separately for foreshocks, main shocks and aftershocks. All of them but one occurred between 1977 and 1997. The Harvard CMT solutions are available for 60 main shocks, 38 foreshocks and 218 aftershocks. The stress drop is estimated using the values of seismic moment and source half duration and the scaling relations between various source parameters: seismic moment, source half duration, fault surface and fault length, taken from Harvard catalogues and other publications. The average stress drop is the highest during foreshocks (1.8 MPa), middle during main shocks (1.1 MPa) and the lowest during aftershocks (0.4 MPa). Similarly, the apparent stress, estimated from seismic moment and radiated energy taken from PDE-NEIC bulletins and other publications, is also the highest for foreshocks (0.6 MPa), middle for main shocks (0.4 MPa) and the lowest for aftershocks (0.2 MPa).

Słowa kluczowe

earthquake sequences foreshocks aftershocks source parameters seismic moment source half duration stress drop apparent stress

Wydawca

Instytut Geofizyki PAN

Czasopismo

Acta Geophysica Polonica

Rocznik

2004

Tom

Vol. 52, nr 3

Strony

271--299

Opis fizyczny

Bibliogr. 195 poz.

Twórcy

autor

Gibowicz S.

gibowicz@igf.edu.pl

Institute of Geophysics, Polish Academy of Sciences, Księcia Janusza 64, 01-452 Warszawa

Bibliografia

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