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| Titel |
A fault and seismicity based composite simulation in northern California |
| VerfasserIn |
M. B. Yıkılmaz, E. M. Heien, D. L. Turcotte, J. B. Rundle, L. H. Kellogg |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 18, no. 6 ; Nr. 18, no. 6 (2011-12-14), S.955-966 |
| Datensatznummer |
250014008
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| Publikation (Nr.) |
 copernicus.org/npg-18-955-2011.pdf |
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| Zusammenfassung |
| We generate synthetic catalogs of seismicity in northern California using a
composite simulation. The basis of the simulation is the fault based
"Virtual California" (VC) earthquake simulator. Back-slip velocities and
mean recurrence intervals are specified on model strike-slip faults. A
catalog of characteristic earthquakes is generated for a period of 100 000 yr.
These earthquakes are predominantly in the range M = 6 to M = 8, but do
not follow Gutenberg-Richter (GR) scaling at lower magnitudes. In order to
model seismicity on unmapped faults we introduce background seismicity which
occurs randomly in time with GR scaling and is spatially associated with the
VC model faults. These earthquakes fill in the GR scaling down to M = 4 (the
smallest earthquakes modeled). The rate of background seismicity is
constrained by the observed rate of occurrence of M > 4 earthquakes in
northern California. These earthquakes are then used to drive the BASS
(branching aftershock sequence) model of aftershock occurrence. The BASS
model is the self-similar limit of the ETAS (epidemic type aftershock
sequence) model. Families of aftershocks are generated following each
Virtual California and background main shock. In the simulations the rate of
occurrence of aftershocks is essentially equal to the rate of occurrence of
main shocks in the magnitude range 4 < M < 7. We generate
frequency-magnitude and recurrence interval statistics both regionally and
fault specific. We compare our modeled rates of seismicity and spatial
variability with observations. |
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