Numerical modeling of the 26th December 2004 India Ocean tsunami at Andaman and Nicobar Islands

Ilayaraja, K.; Ioualalen, Mansour; Chlieh, M.; Krishnamurthy, R. R.; Murthy, M.V. Ramana

doi:10.1007/s11852-008-0033-8

Cited by 4 publications

(2 citation statements)

References 18 publications

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“…The model includes bottom friction and energy dissipation to account for the wave breaking, and a subgrid turbulence scheme. The model has already been validated for various earthquake/tsunami events (Ioualalen 2008; Ioualalen et al 2006, 2007, 2010a,b; Ilayaraja et al 2008; Mard Karisson et al 2009). In relation to this study, for the 2004 December 26, Indian Ocean earthquake/ tsunami, Ioualalen et al (2007) calibrated a seismic source mainly from hydrographic records (tide gauges) that turned out to be relatively accurate.…”

Section: Tsunami Modellingmentioning

confidence: 99%

Reappraisal of the 1887 Ligurian earthquake (western Mediterranean) from macroseismicity, active tectonics and tsunami modelling

Larroque¹,

Scotti

Ioualalen

2012

Geophysical Journal International

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International audienceEarly in the morning of 1887 February 23, a damaging earthquake hit the towns along the Italian and French Riviera. The earthquake was followed by a tsunami with a maximum run-up of 2 m near Imperia, Italy. At least 600 people died, mainly due to collapsing buildings. This 'Ligurian earthquake' occurred at the junction between the southern French-Italian Alps and the Ligurian Basin. For such a historical event, the epicentre and the equivalent magnitude are difficult to characterize with any degree of precision, and the tectonic fault responsible for the earthquake is still under debate today. The recent MALISAR marine geophysical survey allowed the identification of a large system of active faults. We propose that the rupture of some of the segments belonging to this 80-km-long northern Ligurian Faults system connected to a shallow-dipping major thrust plane at depth was the source of the 1887 Ligurian earthquake. We investigated the macroseismic data from the SISFRANCE-08 and DBMI-04 historical databases using several models of intensity attenuation with distance and focal depth. The modelling results are consistent with the off-shore location, with an epicentre around 43.70°-43.78°N and 7.81°-8.07°E, and with a magnitude Mw in the range of 6.3-7.5. Numerous earthquake source scenarios have been tested on the tide gauge record at Genoa harbour. As a result, we present seven characteristic source earthquake scenarios for a shallow strong earthquake occurring below the northern Ligurian margin. The modelled tide gauge records were analysed with the help of basic statistical tools and a simple harmonic analysis, to extract the wave spectrum characteristics. This analysis indicates that scenarios of a magnitude Mw of 6.8-6.9 along a reverse N55°E striking fault are the best candidates to explain the known characteristics of the tsunami that followed. The best-fitting scenarios comprise a 70°-dipping southward fault plane with Mw 6.8 and a 16°-dipping northward fault plane with Mw 6.9, both with reverse kinematics. Taking into account the geometry of the active faults, the location of the macroseismic epicentre and the morphotectonic evolution of the continental slope, we propose that the 1887 Ligurian earthquake corresponded to the reverse faulting of a N55°E striking fault plane dipping to the north with a coseismic slip of 1.5

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Section: Tsunami Modellingmentioning

confidence: 99%

Reappraisal of the 1887 Ligurian earthquake (western Mediterranean) from macroseismicity, active tectonics and tsunami modelling

Larroque¹,

Scotti

Ioualalen

2012

Geophysical Journal International

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“…Results concerning run-up heights and run-in distances as well as simulated wave profiles across realistic beach profiles are not often reported in literature. However, after the great Sumatra earthquake of 26 December 2004, a number of papers focused on realistic simulation of run-ups of earthquake-generated tsunamis (WARD and DAY, 2008;YEAN et al, 2006;CHINNARASRI and PRATOOMCHAI, 2008;PARK et al, 2007;OKAL and HEBERT, 2007;IOUALALEN et al, 2007a, b;ILAYARAJA et al, 2009). Some researchers focused on the tsunami's effects on the coasts of Bangladesh and Thailand, respectively (e.g., IOUALALEN et al, 2007a, b).…”

Section: Introductionmentioning

confidence: 99%

Dynamics and Coastal Effects of Tsunamis Generated by Asteroids Impacting the Black Sea

Bădescu

Isvoranu²

2010

Pure Appl. Geophys.

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Two-dimensional (2D) and one-dimensional (1D) shallow-water models are used to evaluate the seashore effects of the tsunami generated by an asteroid impacting the western regions of the Black Sea about 208 km from the coast. The tsunami's speed and the effects on the coastal regions depend on many factors, among which the most important is asteroid size. The tsunami generated by a 250-m asteroid reaches the nearest land location in 24 min and needs about 2 h to arrive at all Black Sea coast. The run-up value is about 7 m high on the Turkish and Crimean coasts. In the western Black Sea regions the wave height is two or three times smaller. The run-up values strongly depend on bathymetry and topography peculiarities. The run-in value in case of the tsunami generated by a 1,000-m asteroid is up to eight times larger than in case of a 250-m impactor, depending on location. The results reported herein are upper limit values. In case of the 250-m asteroid, the real wave amplitude may be up to two times smaller. The uncertainty factor decreases in case of larger asteroids. Ways of diminishing the social consequences are briefly discussed.

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Characterization of the 26 December 2004 tsunami deposits in Andaman Islands (Bay of Bengal, India)

et al. 2011

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Numerical modeling of the 26th December 2004 India Ocean tsunami at Andaman and Nicobar Islands

Cited by 4 publications

References 18 publications

Reappraisal of the 1887 Ligurian earthquake (western Mediterranean) from macroseismicity, active tectonics and tsunami modelling

Reappraisal of the 1887 Ligurian earthquake (western Mediterranean) from macroseismicity, active tectonics and tsunami modelling

Dynamics and Coastal Effects of Tsunamis Generated by Asteroids Impacting the Black Sea

Characterization of the 26 December 2004 tsunami deposits in Andaman Islands (Bay of Bengal, India)

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