RELOKASI HIPOSENTER GEMPABUMI WILAYAH JAWA MENGGUNAKAN TEKNIK DOUBLE DIFFERENCE

Authors

  • Bambang Sunardi Badan Meteorologi Klimatologi dan Geofisika (BMKG)
  • Supriyanto Rohadi Badan Meteorologi Klimatologi dan Geofisika (BMKG)
  • Masturyono Masturyono Badan Meteorologi Klimatologi dan Geofisika (BMKG)
  • Sri Widiyantoro Institut Teknologi Bandung (ITB)
  • Sulastri Sulastri Badan Meteorologi Klimatologi dan Geofisika (BMKG)
  • Pupung Susilanto Badan Meteorologi Klimatologi dan Geofisika (BMKG)
  • Thomas Hardy Badan Meteorologi Klimatologi dan Geofisika (BMKG)
  • Wiko Setyonegoro Badan Meteorologi Klimatologi dan Geofisika (BMKG)

DOI:

https://doi.org/10.31172/jmg.v13i3.133

Keywords:

relokasi gempabumi, perbedaan ganda, hypoDD, wilayah Jawa, earthquake relocation, double difference, Jawa region

Abstract

Relokasi hiposenter gempabumi penting dilakukan untuk mendapatkan lokasi gempabumi dengan ketelitian yang tinggi, diperlukan untuk pemetaan kerawanan gempabumi, studi struktur kecepatan, analisis seismisitas untuk studi global maupun studi lokal dan dalam analisis struktur detail seperti halnya identifikasi zona patahan dan sebaran serta orientasi patahan mikro. Salah satu teknik yang sekarang ini digunakan untuk merelokasi gempabumi adalah algoritma double difference (perbedaan ganda). Relokasi dilakukan terhadap data gempabumi BMKG yang terjadi di wilayah Jawa yang terletak pada 105°-115°BT dan 4°–12°LS. Jumlah gempabumi sebanyak 1352 kejadian. Jaringan stasiun  pencatat yang dipergunakan sebanyak 47 buah. Hasil relokasi menunjukkan pergeseran hiposenter lebih dari 50 km sebanyak 7 gempabumi. Pergeseran hiposenter menyebar ke segala arah dan tidak memiliki kecenderungan ke arah tertentu, namun demikian perubahan hiposenter terbanyak ke arah barat. Relokasi gempabumi dengan kedalaman awal 10 km menunjukkan pergeseran yang random. Relokasi menggunakan hypoDD menunjukkan peningkatan kualitas bila dilihat dari distribusi residual.

 

Relocation of earthquake hypocenter is important for obtaining an very accurate earthquake location which is needed for mapping of earthquakes vulnerability, velocity structure study, global and local studies of seismicity analysis and detail structural analysis as well as identification of the fault zone, distribution and orientation of microfracture. One technique currently used to relocate earthquakes is double difference algorithm. Relocation performed on BMKG earthquake data that occurred on Java region, located on 105°-115°E and 4°-12°S. The total number of earthquakes are 1352 events. We used 47 recording station networks. Hypocenter relocation results showed 7 earthquakes shift more than 50 km. Shift in hypocenter spread in all directions and do not have a tendency, however, most hypocenter changes to west. Relocation of initial depth 10 km earthquakes showed random shifst. Relocation using hypoDD showed an increase in quality when viewed from the residual distribution.

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Published

2012-12-15

How to Cite

Sunardi, B., Rohadi, S., Masturyono, M., Widiyantoro, S., Sulastri, S., Susilanto, P., Hardy, T., & Setyonegoro, W. (2012). RELOKASI HIPOSENTER GEMPABUMI WILAYAH JAWA MENGGUNAKAN TEKNIK DOUBLE DIFFERENCE. Jurnal Meteorologi Dan Geofisika, 13(3). https://doi.org/10.31172/jmg.v13i3.133

Issue

Vol. 13 No. 3 (2012)

Section

Article

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