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JAKARTA. Head Vulakanology and Geological Hazard Mitigation (PVG) Surono explained about the earthquake that shook Tasikmalaya and surrounding areas Saturday (26 / 6) then. According to SR 6.3 scale earthquake occurred due to inter-plate subduction activity.

"The quake was caused by the activities of the Indian Ocean towards the plate subducted beneath the Eurasian Plate," said Surono.

Southern region of West Java in general composed of sediment rocks, volcanic rocks, and rocks of Tertiary age that has experienced weathering. Unlike the northern region composed of alluvium, volcanic rocks and other rock old quarter. The nature of these rocks asunder, apart, yet compact (unconsolidated), thus strengthening the effects of vibration.

According to the results of seismometers recording in the Post Volcano (PGA) G. Galunggung, Tasikmalaya. Earthquake lasted approximately 400 seconds with the perceived intensity of an earthquake at the scale III MMI (Modified Mercalli Intensity). And the recording sounds the same equipment at the PGA G. Papandayan, Garut, duration is 776 seconds earthquake with intensity III earthquake felt in the MMI scale.

Furthermore Surono urge people to remain calm and follow directions as well as information from the officers and Satkorlak Satlak PB PB and do not be goaded into issues that are not responsible for the earthquake and tsunami. Earthquake did not cause a tsunami karean though centered on the sea, but the energy release is not strong enough to trigger a tsunami. (SF)

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