Penentuan Hiposenter Gempabumi Dan Model Kecepatan Lokal Di Wilayah Jawa Timur Menggunakan Metode Double Difference

Novianti, Chi Chi (2016) Penentuan Hiposenter Gempabumi Dan Model Kecepatan Lokal Di Wilayah Jawa Timur Menggunakan Metode Double Difference. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Jawa Timur, secara fisiologis maupun geografis, terdapat gunungapi dan sesar yang masih aktif serta berpotensi terjadi gempabumi. Penelitian ini dilakukan untuk mengetahui model kecepatan bumi lokal 1-D, menentukan distribusi persebaran hiposenter dan hasil relokasi hiposenter gempabumi berdasarkan kejadian yang digunakan menggunakan metode double difference yang terjadi di wilayah Jawa Timur. Data yang digunakan dalam penelitian ini data gempa tahun 2007 sampai 2015 di wilayah Jawa Timur. Penelitian ini menggunakan metode double difference yaitu metode yang menggunakan data relatif waktu tempuh antar dua hiposenter. Prinsip metode ini adalah jika jarak persebaran hiposenter antara dua gempa sangat kecil dibanding jarak antara stasiun ke sumber, maka ray path gempa dapat dianggap mendekati sama. Hasil yang diperoleh yaitu, model kecepatan bumi lokal 1-D yang diperoleh 5 lapisan dengan kecepatan 4,71 km/s - 7,14 km/s dan moho pada kedalaman mendekati 30 km. Hasil relokasi hiposenter menggunakan metode double difference menunjukkan bahwa metode ini mampu memberikan hasil koordinat episenter yang akurat dengan diperolehnya nilai Rms residual mendekati 0. Adanya penelitian ini dapat dijadikan sebagai salah satu upaya mitigasi bencana untuk masyarakat di Jawa Timur. =========================================================== East Java, physiologically and geographically, has volcanoes and faults which are still active and potentially resulting in earthquake disaster. This study is conducted to determine the local earth velocity model 1-D, determine the distribution of the hypocenter distribution and relocation of earthquake hypocenter based on event which applied using double difference method that occurred in East Java. The data is used in this study from seismic data in 2007 until 2015 in East Java. This study uses a double-difference method which is a method to use the data of time travel relativity between hypocenters. The principle of this method is that if the distance between two earthquake hypocenter distributions is small compared to the distance between the station and the source, the raypath can be considered as approximating same. The result from this study shows that local earth velocity model 1-D gained 5 layers at 4,71 km/s - 7,14 km/s and moho located at 30 km. The result of the hypocenter relocation using double-difference method shows that this method is able to accurately provide the coordinates of the epicenter by obtaining the Rms value approximating 0. The existence of this research can be used as disaster mitigation for communities in East Java.

Item Type: Thesis (Undergraduate)
Additional Information: RSFi 624.176 2 Nov p
Uncontrolled Keywords: double difference, model kecepatan lokal, relokasi, subduksi Jawa Timur
Subjects: G Geography. Anthropology. Recreation > GB Physical geography
Q Science > QC Physics > QC866.5 Climatology--Forecasting.
Divisions: Faculty of Mathematics and Science > Physics > 45201-(S1) Undergraduate Thesis
Depositing User: EKO BUDI RAHARJO
Date Deposited: 24 Oct 2019 08:45
Last Modified: 24 Oct 2019 08:45
URI: http://repository.its.ac.id/id/eprint/71398

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