Manila Trench is rocking

Earthquakes in the Manila Trench

The Manila Trench is an oceanic trench in the Pacific Ocean, located west of the islands of Luzon and Mindoro.  This subduction zone reaches a depth of about 5,400 metres,  in contrast with the average depth of the South China Sea of about 1,500 metres. The Manila Trench is currently very active. Yesterday a magnitude 6.2 earthquake followed a series of medium strong quakes.

Earthquakes in the Manila Trench

Manila Trench Hazards

The potential for a tsunami event originating along the Manila trench, similar in scale to the 2004 South Asia tsunami has been forecasted. The source of this tsunami would be very proximal to the coast of Taiwan (~100km). The earthquake causing this event has been predicted to be of magnitude 9.3 (stronger than the 9.0 magnitude 2004 Sumatra event). This massive earthquake, which would be the 2nd strongest in recent history, would have a total length of 990km and a maximum wave height of 9.3 meters. This event would cause serious flooding, especially in Taiwan, and could affect regions up to 8.5 km inland.  The predicted tsunami would reach the southern coast of Thailand in around 13 hours and reach Bangkok in 19 hours. This disaster would also affect the Philippines, Vietnam, Cambodia and China.

The most recent large scale event originating from the Manila Trench was the 2006 Pingtung dual earthquakes. These 7.0 earthquakes had 8 minutes of offset and produced a 40 centimeter tsunami; which happened to be the largest tsunami experienced on the southwest Taiwan coast. The epicenter of these dual earthquakes originated on the north part of the Manila Trench.

(source: wikipedia)

Earthquakes in the Manila Trench

Yesterday’s earthquake in the Manila Trench did not trigger a tsunami. Despite the great distance, the quake was felt with intensity III in Calayan, Cagayan and Laoag City. Intensity II was felt in Vigan, Ilocos Sur and Basco, Batanes.

Track all Philippine earthquakes on our interactive Earthquake Page. This quake had been number 1811 this year.


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2 Responses

  1. Anon says:

    Keep up the good work.

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