Study of the rupture process of tsunamigenic earthquakes by joint inversion of geophysical data
16 June 2008, 14.30 pm | Fabrizio Romano | Conference Room Rome | Headquarters | Seminars uf4 section Rome 1
Study of the rupture process of tsunamigenic earthquakes by joint inversion of geophysical data
Large earthquakes that occur along subduction zones are often characterized by the generation of tsunamis. However, a great variability is observed in the tsunamigenic potential of these large earthquakes: events of equal magnitude generate, depending on the case, small or large tsunamis. This often depends on the geometrical and kinematic characteristics of the cosismic failure and on the mechanical properties of the source zone. The determination of these parameters is therefore of fundamental importance for the understanding of tsunamigenesis.
Today, thanks to the quality and quantity of available data and the computational capabilities of modern computers, it is possible to reconstruct the cosismic rupture process of large tsunamigenic earthquakes and to investigate the peculiar characteristics of each single event.
In this work we present a method for the determination of some kinematic properties of the tsunamigen source (slip distribution, failure front velocity, source zone stiffness), based on a joint inversion technique of tide gauges, satellite altimetric data and movements measured by GPS. As a case study we show in particular the earthquake analysis of Tokachi-Oki, Japan (Mw 8.3) of September 25, 2003.
References
8.3 earthquake from joint inversion of tsunami and GPS data, Geophysical
Research Abstracts, Vol. 10, EGU2008-A-09629
http://www.copernicus.org/EGU/awards/medallists/_2008/ysopp_award_winners_2008.html
Large earthquakes that occur along subduction zones are often characterized by the generation of tsunamis. However, a great variability is observed in the tsunamigenic potential of these large earthquakes: events of equal magnitude generate, depending on the case, small or large tsunamis. This often depends on the geometrical and kinematic characteristics of the cosismic failure and on the mechanical properties of the source zone. The determination of these parameters is therefore of fundamental importance for the understanding of tsunamigenesis.
Today, thanks to the quality and quantity of available data and the computational capabilities of modern computers, it is possible to reconstruct the cosismic rupture process of large tsunamigenic earthquakes and to investigate the peculiar characteristics of each single event.
In this work we present a method for the determination of some kinematic properties of the tsunamigen source (slip distribution, failure front velocity, source zone stiffness), based on a joint inversion technique of tide gauges, satellite altimetric data and movements measured by GPS. As a case study we show in particular the earthquake analysis of Tokachi-Oki, Japan (Mw 8.3) of September 25, 2003.
References
- Piatanesi A. and S. Lorito (2007), Rupture process of the 2004 Sumatra-Andaman earthquake from tsunami waveform inversion, Bull. Seismol. Soc. Am., 97 (1A), S223-S231, doi:10.1785/0120050627
- Lorito S., F. Romano, A. Piatanesi and E. Boschi (2008), Source process of the September 12, 2007, MW 8.4 southern Sumatra earthquake from tsunami tide gauge record inversion, Geophys. Res. Lett., 35, L02310, doi:10.1029/2007GL032661
- Lorito S., A. Piatanesi and A. Lomax (2008), Rupture process of the 18 April 1906 California earthquake from near-field tsunami waveform inversion, Bull. Seismol. Soc. Am., 98 (2), 832-845, doi: 10.1785/0120060412
- Romano F., S. Lorito, A. Piatanesi, A. Antonioli, DL George and K. Hirata
8.3 earthquake from joint inversion of tsunami and GPS data, Geophysical
Research Abstracts, Vol. 10, EGU2008-A-09629
http://www.copernicus.org/EGU/awards/medallists/_2008/ysopp_award_winners_2008.html