PENGARUH PASANG SURUT BUMI TERHADAP GEMPABUMI MENTAWAI 25 OKTOBER 2010 MW 7,8

• Main Authors: , IWAN AFFANDI WIJAYA, , Dr.rer.nat. Wiwit Suryanto M.si
• Format: Theses and Dissertations NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2013
• Subjects: ETD
• Online Access: https://repository.ugm.ac.id/124486/; http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=64632
• Institution: Universitas Gadjah Mada

Mentawai island is a regency in West Sumatra, Indonesia. It is located near to tectonic plate subduction, therefore it makes the island very prone to earthquake. 12 km deep and 7.8 magnitude earthquake at 21:42:59 (GMT+7), Oct 25, 2010 was one of the major earthquakes that ever hit this island. It occurred at 99,32° Longitude - 3,71° Latitude (CMT Catalog). Those earthquake is the major earthquake for this research. The Datas in this research were obtained from Harvard Centroid Moment Tensor (CMT Catalog), global earthquake center. Earthquake data in surrounding area 0°- 8° latitudes and 95° - 105° longitudes were collected from Januari 1 st , 1977 to December 31 th , 2012 with Mentawai earthquakes is a major earthquake on the date of October 25 th , 2010 at 21:42:59 (GMT+7), at positions of 99.32° Longitude - 3.71° Latitude (CMT Catalog). The datas were proced to calculate phase angle for each event of earthquake and then Schuster statistical test was perfomed every 5 years with 2 years shift time. Based on the result, only normal stress component that showed positive correlation on phase angle and p value. Shear stress component just showed positive correlation to � value. It can be concluded that 2010 Mentawai earthquake with Mw 7.8 was triggered by the tide if normal stress component was used.