Characterization of tsunamigenic earthquake in Java region based on seismic wave calculation
Pribadi S.a, Afnimarb, Puspito N.T.b, Ibrahim G.b
a Badan Meteorologi Klimatologi Geofisika, Indonesia
b Institut Teknologi Bandung, Indonesia
Abstract
This study is to characterize the source mechanism of tsunamigenic earthquake based on seismic wave calculation. The source parameter used are the ratio (Θ) between the radiated seismic energy (E) and seismic moment (Mo), moment magnitude (MW), rupture duration (T o) and focal mechanism. These determine the types of tsunamigenic earthquake and tsunami earthquake. We calculate the formula using the teleseismic wave signal processing with the initial phase of P wave with bandpass filter 0.001 Hz to 5 Hz. The amount of station is 84 broadband seismometer with far distance of 30° to 90°. The 2 June 1994 Banyuwangi earthquake with MW=7.8 and the 17 July 2006 Pangandaran earthquake with MW=7.7 include the criteria as a tsunami earthquake which distributed about ratio Θ=-6.1, long rupture duration To>100 s and high tsunami H>7 m. The 2 September 2009 Tasikmalaya earthquake with M W=7.2, Θ=-5.1 and To=27 s which characterized as a small tsunamigenic earthquake. © 2014 AIP Publishing LLC.
Author keywords
Broad-band seismometers,Earthquake and tsunamis,Moment magnitudes,Radiated seismic energies,Seismic energy,Source mechanisms,Source parameters,Wave calculations
Indexed keywords
Characterization,earthquake,moment seismic,seismic energy,tsunami