That (collapse) could have happened if the earthquake was strong
Padang (Rifyu.com) – Earthquake expert from Andalas University (Unand) West Sumatra (West Sumatra) Dr Badrul Mustafa is worried that an earthquake caused by Indo-Australian subduction activity could destroy the Sianok Gorge, Agam Regency, West Sumatra.
“That (collapse) could have happened if the earthquake was strong,” he said in Padang, Tuesday.
Moreover, he said, the walls of the Sianok Gorge in Agam Regency are not strong rocks so they have the potential to collapse if the earthquake shaking is strong.
“So there could be landslides there (Sianok Canyon), especially earthquakes originating from the Semangko Fault,” explained the Geophysics and Meteorology graduate of the Bandung Institute of Technology (ITB).
As is known, the Semangko Fault starts from Aceh to Lampung, which is estimated to also be adjacent to Bukit Barisan.
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Badrul said of the 20 segments of the Semangko Fault, four are in West Sumatra, one of which is the Sianok segment. A few days before, when there was an earthquake (Sianok segment) there was a landslide in Sianok Gorge.
Therefore, according to him, the earthquake activity which was centered in the Mentawai Islands Regency with a magnitude of 6.9 at 03.00 WIB was feared to collapse the Sianok Gorge.
He gave an example of the vibrations of the December 2004 Simeulue earthquake which caused a tsunami which were also felt by people in Malaysia. Then if you pay attention to the earthquake in the Mentawai Islands Regency with a magnitude of 6.9 with the Simeulue Aceh Earthquake, and the Nias Earthquake on March 28, 2005, they have the same mechanism.
BMKG said the earthquake in the Mentawai Islands Regency was a shallow earthquake due to subduction activity of the Indo-Australian Plate. The results of the analysis of the source mechanism show that the tectonic earthquake has a mechanism of upward movement or thrust fault.
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Reporter: Muhammad Zulfikar
Editor: Risbiani Fardaniah
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