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| Titel |
Source rupture process of the 12 January 2010 Port-au-Prince (Haiti, Mw7.0) earthquake |
| VerfasserIn |
José Borges, Bento Caldeira, Mourad Bezzeghoud, Rúben Santos |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250044504
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| Zusammenfassung |
| The Haiti earthquake occurred on tuesday, January 12, 2010 at 21:53:10 UTC. Its
epicenter was at 18.46 degrees North, 72.53 degrees West, about 25 km WSW of
Haiti’s capital, Port-au-Prince. The earthquake was relatively shallow (H=13 km,
U.S. Geological Survey) and thus had greater intensity and destructiveness. The
earthquake occurred along the tectonic boundary between Caribbean and North
America plate. This plate boundary is dominated by left-lateral strike slip motion and
compression with 2 cm/year of slip velocity eastward with respect to the North America
plate.
The moment magnitude was measured to be 7.0 (U.S. Geological Survey) and 7.1
(Harvard Centroid-Moment-Tensor (CMT). More than 10 aftershocks ranging from 5.0 to 5.9
in magnitude (none of magnitude larger than 6.0) struck the area in hours following the main
shock. Most of these aftershocks have occurred to the West of the mainshock in the
Mirogoane Lakes region and its distribution suggests that the length of the rupture was
around 70 km.
The Harvard Centroid Moment Tensor (CMT) mechanism solution indicates lefth-lateral
strike slip movement with a fault plane trending toward (strike = 251o ; dip = 70o; rake =
28o). In order to obtain the spatiotemporal slip distribution of a finite rupture model we have
used teleseismic body wave and the Kikuchi and Kanamori’s method [1]. Rupture velocity
was constrained by using the directivity effect determined from a set of waveforms well
recorded at regional and teleseismic distances [2]. Finally, we compared a map of
aftershocks with the Coulomb stress changes caused by the event in the region
[3].
[1]- Kikuchi, M., and Kanamori, H., 1982, Inversion of complex body waves: Bull.
Seismol. Soc. Am., v. 72, p. 491-506.
[2] Caldeira B., Bezzeghoud M, Borges JF, 2009; DIRDOP: a directivity approach to
determining the seismic rupture velocity vector. J Seismology, DOI 10.1007/s10950-009-9183-x
(http://www.springerlink.com/content/xp524g2225628773/)
[3] -King, G. C. P., Stein, R. S. y Lin, J, 1994, Static stress changes and the triggering of
earthquakes. Bull. Seismol. Soc. Am. 84,935-953. |
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