Seismic and magnetotelluric interpretation near Parkfield, California: Testing 
a joint inversion of independet data sets

Julia, J.; Shalev, E.; Chavarria, J.; Onacha, S.; Malin, P. E.; Hole, J. A.; Ryberg, Trond; Cumming, W. B.; Suemnicht, G.

Datensatz

DATENSATZ AKTIONENEXPORT

Zur Ablage hinzufügen

Lokale TagsFreigabegeschichteDetailsÜbersicht

Freigegeben

Konferenzbeitrag

Seismic and magnetotelluric interpretation near Parkfield, California: Testing a joint inversion of independet data sets

Urheber*innen

Julia, J.
External Organizations;

Shalev, E.
External Organizations;

Chavarria, J.
External Organizations;

Onacha, S.
External Organizations;

Malin, P. E.
External Organizations;

Hole, J. A.
External Organizations;

/persons/resource/trond

Ryberg, Trond
2.2 Geophysical Deep Sounding, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Cumming, W. B.
External Organizations;

Suemnicht, G.
External Organizations;

Externe Ressourcen

Es sind keine externen Ressourcen hinterlegt

Volltexte (frei zugänglich)

Es sind keine frei zugänglichen Volltexte in GFZpublic verfügbar

Ergänzendes Material (frei zugänglich)

Es sind keine frei zugänglichen Ergänzenden Materialien verfügbar

Zitation

Julia, J., Shalev, E., Chavarria, J., Onacha, S., Malin, P. E., Hole, J. A., Ryberg, T., Cumming, W. B., Suemnicht, G. (2004): Seismic and magnetotelluric interpretation near Parkfield, California: Testing a joint inversion of independet data sets, (EOS, Transactions, American Geophysical Union, Suppl.; Vol. 85, 47), AGU 2004 Fall Meeting (San Francisco 2004) (San Francisco).

https://gfzpublic.gfz-potsdam.de/pubman/item/item_232672

Zusammenfassung

We present a simultaneous interpretation of coincident magnetotelluric (MT) and seismic refraction lines near the Parkfield, CA, San Andreas Fault Observatory at Depth site. The MT data set was acquired with Phoenix 4-channel systems with average station spacing of about 250 m over a profile length of ($sim$5000) m. The time-domain recording scheme was designed to yield data in the 0.01-200 Hz frequency band. The seismic travel-times were obtained from a SAFOD-related refraction/reflection line that was shot in the fall of 2003. The station and shot spacing for the line section coincident with the MT data were 50~m and 500~m, respectively. An initial, first-pass model of the seismic data suggests a simple structure lies beneath the study site: a 1.0-1.5 km thick, gradational, sedimentary layer with surface topography over a more uniform igneous basement. Modeling of the MT data alone shows a significant trade off exists in these data between the sediment thickness and the basement resistivity. To integrate the separate seismic and MT interpretations we combine both data sets into a joint inversion scheme by assuming that rapid velocity changes are accompanied with correspondingly rapid resistivity changes. We expect the combination will yield a mutually consistent estimate of sediment thickness and basement topography beneath the studied line.