Rupture process of the 1999 November 12 Düzce (Turkey) earthquake deduced from strong motion and Global Positioning System measurements

Details Rupture process of the 1999 November 12 Düzce (Turkey) earthquake deduced from strong motion and Global Positioning System measurements Rupture process of the 1999 November 12 Düzce (Turkey) earthquake deduced from strong motion and Global Positioning System measurements

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004geoji.159..207b&link_type=abstract

Geophysical Journal International, Volume 159, Issue 1, pp. 207-211.

Astronomy and Astrophysics

Astronomy

5

Earthquake Kinematics, Gps Measurements, Rupture Process, Strong Ground Motion

Scientific paper

We use the strong motion data recorded at near-fault accelerometers combined with Global Positioning System (GPS) measurements to infer the space and time evolution of the Mw= 7.2 1999 November 12 Düzce (Turkey) earthquake. We confirm that the rupture is subshear towards the west whereas it overpassed the shear speed towards the east. The mechanism of the earthquake is predominantly right lateral on a 65° north-dipping fault. The strike-slip we infer represents at least 75% of the total seismic moment. We stress that the use of strong motion data allows us to constrain a strong spatial variation of the slip direction during faulting: to the west of the hypocentral region, the slip is oblique accompanied by a significant normal component. In the central and eastern part of the activated fault the slip is almost pure right lateral. This result is consistent both with the surface offset observations and with the long-term morphology of the fault. Neither strong motion data nor GPS data can resolve the complexity of the eastern termination of the Düzce rupture.

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