臺菲VOTE計畫:馬尼拉隱沒帶的海洋及鄰近陸上地球物理調查(3/3)

Project Details

Description

Most of the recent destructive earthquakes occurred as megathrust events in subduction zones. Examples of these events are the 2004 Indian Ocean earthquake and tsunami as well as the 2011 Tohoku, Japan earthquake andtsunami. In the Philippines, the Moro Gulf earthquake and tsunami of 1976 devastated the southern coast of Mindanao which resulted to casualties estimated at 5000-8000. Impacts of earthquakes to local populations are veryevident during the more recent events like the 1990 Luzon and 2015 Bohol earthquakes. The recent discovery of a thick tsunami deposit in Dongdao Island in the middle of the South China (Sun et al., 2013) signify the capacity of the Manila Trench mega-thrust fault to generate very strong and destructive earthquakes. These earthquakes can induce massive submarine landslides and tsunamis that impact the areas surrounding the South China Sea (SCS). Yang and others (2019) investigated Song dynasty ceramic shards in the Nan’ao Island in the southeast coast of the Chinese Mainland (Guangdong Province) and found evidence of a major tsunami event in AD1024, roughly 1000 years ago. Thisdevastating tsunami is also attributed to a large submarine earthquake with an approximate aximum magnitude of Mw 8 along the Manila Trench. Theserecent discoveries are evidences of past large earthquakes and tsunamis in the SCS. Considering this information, there is a renewed interest in the seismogenic and tsunamigenic potentials of the Manila Trench mega-thrust fault. The joint research will investigate the Manila subduction zone utilizing marine and onshore geophysical methods (i.e. gravity, magnetic, seismic reflection, and ocean bottomseismometer surveys). The offshore and onshore data will be integrated to produce a more complete understanding of the subduction zone structure and processes from the marine trench region to the active volcanic arc and faultsonshore. Results of the proposed joint research are important for countries bordering the South China Sea (i.e. Philippines. Taiwan, Vietnam, China, Malaysia, Thailand, and Indonesia) in terms of geohazards and disaster riskreduction. Considering the direct impact of an impending large magnitude earthquake and tsunami to Metropolitan Manila, there is an urgent need to conduct this important research work.
StatusFinished
Effective start/end date1/11/2231/10/23

UN Sustainable Development Goals

In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This project contributes towards the following SDG(s):

  • SDG 11 - Sustainable Cities and Communities
  • SDG 14 - Life Below Water
  • SDG 15 - Life on Land
  • SDG 17 - Partnerships for the Goals

Keywords

  • Earthquake; Subduction Zone; Trench; Marine geophysics; Tsunami

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