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2015 Sabah earthquake

Earthquake in eastern Malaysia

  • 9 min read
  • 4 chapters

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Through Lithosphere and Fault (geology)

Tremors were also felt in Tambunan, Tuaran, Kota Kinabalu, Inanam, Kota Belud, Kota Marudu, Kudat, Likas, Penampang, Putatan, Kinarut, Papar, Beaufort, Keningau, Beluran, Sandakan, Kunak, Tawau in Sabah and as far afield as Federal Territory of Labuan, Lawas, Limbang and Miri in Sarawak as well as Bandar Seri Begawan in Brunei.

Eighteen fatalities were reported, all occurring on Mount Kinabalu, including ten Singaporeans, six Malaysians, and two from both China and Japan. About 137 climbers were stranded on the mountain but were subsequently rescued.

As a result of the earthquake, most areas in the Kinabalu Park have been closed temporarily until the situation is cleared and undergoing repairs and rehabilitation.

Tectonic setting

Sabah lies within the Sunda plate away from any plate boundaries. It was the location of a convergent plate boundary until some time during the Early Miocene. Since then Sabah has been massively uplifted, with the Kinabalu Granite, which was emplaced during the early Late Miocene (between 7.8 and 7.2 million years ago), being exhumed at a rate of 7 mm per year during Late Miocene–Early Pliocene (~ 8–3 Ma ago). the region continues to rise at a long term rate of about 0.5 mm each year. The uplift is thought to be a result of either break-off of the subducted slab or delamination of the lithosphere. Despite not being at a plate boundary, GPS measurements show that the coastal part of Sabah is moving towards the north-west. The uplift is thought to be driving gravitational collapse with sliding of the northwestern part of Sabah being accommodated by extension. This is consistent with the focal mechanism of earlier earthquakes in the onshore area.

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