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3D crustal structure of the northwest Alborz region (Iran) from local earthquake tomography
Swiss Fed Inst Technol, Inst Geophys, Dept Geophys, Sonneggstr 5, CH-8092 Zurich, Switzerland.;Grad Univ Adv Technol, Dept Geol, Kerman, Iran..
Swiss Fed Inst Technol, Inst Geophys, Dept Geophys, Sonneggstr 5, CH-8092 Zurich, Switzerland..
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Geofysik. Univ Tehran, Inst Geophys, Tehran, Iran..
Grad Univ Adv Technol, Dept Geol, Kerman, Iran..
2016 (Engelska)Ingår i: Swiss Journal of Geosciences, ISSN 1661-8726, E-ISSN 1661-8734, Vol. 109, nr 3, s. 389-400Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We performed a 3D seismic tomography study of the northwest Alborz region in Iran, by inversion of P-wave arrival times of nearly 250 local earthquakes recorded at 13 permanent stations between 2006 and 2010. We applied the simultaneous inversion code SIMULPS14 carefully tuned to data set by choice of optimal regularization parameters. Resolution tests with synthetic data show that the inversion results are well constrained around the North Tabriz Fault (NTF) from 3 to 16 km depth. In this depth range, our results show a series of anomalies with relatively high and low velocity, reflecting the heterogeneous geology of northwest Alborz and generally correlating well with local changes of rock types at the surface across this section of the NTF. The boundary surface between the distinct velocity anomalies is generally consistent with the NTF strike. The high and low velocity anomalies at 5-14 km depth parallel to the surface expression of the NTF are interpreted as basaltic volcanic rocks in the south and Mesozoic sedimentary and basement rocks in the north. In addition, cross sections show a significant change in dip of the NTF in the southeastern part, from nearly vertical in the NW to about 60A degrees dip toward SE.

Ort, förlag, år, upplaga, sidor
2016. Vol. 109, nr 3, s. 389-400
Nyckelord [en]
Seismic travel time tomography, Crustal structure, NW Alborz region, North Tabriz Fault
Nationell ämneskategori
Geologi
Identifikatorer
URN: urn:nbn:se:uu:diva-312972DOI: 10.1007/s00015-016-0219-2ISI: 000390028300006OAI: oai:DiVA.org:uu-312972DiVA, id: diva2:1069857
Tillgänglig från: 2017-01-30 Skapad: 2017-01-16 Senast uppdaterad: 2017-11-29Bibliografiskt granskad

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