ANALISA FRAKTAL DAN RASIO SLIP DAERAH BALI-NTB BERDASARKAN PEMETAAN VARIASI PARAMETER TEKTONIK

Authors

  • Bambang Sunardi Badan Meteorologi Klimatologi Dan Geofisika (BMKG)

DOI:

https://doi.org/10.31172/jmg.v10i1.33

Keywords:

Fractal dimension, Slip ratio, b-value

Abstract

Distribusi gempabumi secara tidak langsung dapat dianggap sebagai fraktal dan parameter skalanya biasa dinamakan dimensi fraktal (D). Kegempaan dicirikan oleh parameter tektonik (nilai-b) dan dimensi fraktal (D). Dimensi fraktal berkaitan erat dengan parameter tektonik (nilai-b) dari relasi Gutenberg-Richter : log N =-bM+a. Berdasarkan pemetaan nilai-b,  dimensi fraktal dan rasio slip daerah Bali-NTB telah dihitung pada penelitian ini menggunakan katalog NEIC 1973-2008. Nilai-b pada daerah yang terletak antara  6°-12°LS  dan 114°-121°BT bervariasi antara 0,7-2.Nilai-b yang rendah terletak disebelah selatan pulau Sumbawa-Sumba dan  sebelah utara pulau Lombok-Sumbawa. Dimensi fraktal pada kluster I dan II mendekati 2 yang mengindikasikan bahwa distribusi sumber 2D. Dimensi fraktal pada kluster III mendekati nilai 3 yang mengindikasikan bahwa distribusi sumber 3D. Rasio slip pada kluster I dan II mendekati nilai 0,5 yang mengindikasikan bahwa sekitar 50 % total slip terjadi pada patahan utama. Rasio slip pada kluster III mendekati nilai 0 yang mengindikasikan  semua slip terjadi pada patahan-patahan kecil.

 

Earthquake distributions are indirectly considered fractal, and the scaling parameter is called fractal dimension (D). Seismicity is characterized by tectonic parameter (b-value) and fractal dimension (D). Fractal dimension is related to the tectonic parameter (b-value) of the Gutenberg-Richter relation : log N =-bM+a. Based on b-value mapping, fractal dimension and slip ratio of Bali-NTB region has been calculated in this research using NEIC catalogue 1973-2008. b-values in those regions which are located between latitudes 6° -12° S  and longitudes 114°-121°E vary between 0.7-2. b-values are low in southern Sumbawa-Sumba islands and northern Lombok-Sumbawa islands. Fractal dimensions at cluster I and II are close to 2 which indicate that source distribution was in 2D space. Fractal dimension at cluster III is close to 3 which indicates that source distribution was in 3D space. Slip ratios at cluster I and II are close to 0.5 which reveals that about 50 % of the total slip has occurred on primary fault. Slip ratio at cluster III was close to 0 which reveals that all the slips occur on the smaller faults.

Downloads

Download data is not yet available.

Downloads

Published

2009-07-01

How to Cite

Sunardi, B. (2009). ANALISA FRAKTAL DAN RASIO SLIP DAERAH BALI-NTB BERDASARKAN PEMETAAN VARIASI PARAMETER TEKTONIK. Jurnal Meteorologi Dan Geofisika, 10(1). https://doi.org/10.31172/jmg.v10i1.33

Issue

Vol. 10 No. 1 (2009)

Section

Article

License

Copyright (c) 2014 Bambang Sunardi

Creative Commons License

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

Authors who publish with this journal agree to the following terms:

  1. Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
  2. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
  3. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work.