Strong motion of this earthquake
- 1. Introduction
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On October 1 2009 at 08:52 AM (local time), an earthquake with magnitude (Mw) 6.6 occurred in inland Sumatra, Indonesia. Acceleration waveforms of this earthquake were recorded by a strong motion seismograph at station KSI, which is located at the hypocentral distance of 194 km. Station KSI was installed by NIED and JAMSTEC, and has been operated by JAMSTEC and BMKG.
- 2. Strong motion records
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Fig.1 shows the locations of the epicenter and station KSI as well as acceleration seismograms at KSI. The seismograms indicate that shaking
continued for more than one minute and the amplitudes of the horizontal components are larger than that of the vertical one. We estimated the
peak ground acceleration (PGA) to be 24.4 gal (0.244 m/s²) from the records of two horizontal components.
Fig.1 Acceleration seismograms at KSI station
- 3. Comparison with estimated PGA
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We calculated PGA of this earthquake using the attenuation relation proposed by Kannno et al. (BSSA, 96, 879-897, 2006). Fig.2 indicates the spatial distribution of the estimated PGA. We can find that the observed PGA at KSI is similar to the estimated one.
Fig.2 Distribution of the estimated PGA
Last update: October 2, 2009
NIED HOME International Seismic Network Laboratory, NIED
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