Estimasi Intensitas Gempa Bumi Dan Percepatan Tanah Maksimum Kota Padang Berdasarkan Data Historis Gempa 1976-2016 di Wilayah Mentawai

Authors

  • Dwi Pujiastuti
  • Rido Nofaslah
  • Arif Budiman

DOI:

https://doi.org/10.25077/jif.9.2.110-120.2017

Abstract

Telah dilakukan estimasi nilai intensitas gempa bumi dan percepatan tanah maksimum di Kota Padang  berdasarkan data historis gempa 1976-2016 di wilayah  Mentawai.  Rumusan empiris Si and Midorikawa (1999) digunakan untuk menghitung percepatan tanah maksimum dan rumusan empiris Murphy O’Brein untuk menghitung intensitas gempa. Data yang digunakan diperoleh dari USGS untuk gempa di wilayah Mentawai dengan dengan kekuatan ≥ 5 SR dan kedalaman ≤ 70 km dari tahun 1976 – 2016.  Daerah penelitian dibatasi oleh  1.1o LS - 0,4o LU dan 100,05o BT – 100,35o BT yang dibagi dengan jarak grid 0,02o sehingga didapatkan 208 titik penghitungan. Intensitas gempa dan percepatan tanah maksimum dihitung berdasarkan data gempa di wilayah intraplate dan interplate. Dari hasil pengolahan data didapatkan peta  percepatan tanah maksimum dan intensitas gempa Kota Padang dari kedua wilayah gempa tersebut.. Nilai percepatan tanah maksimum terbesar di Kota Padang akibat gempa di wilayah interplate segmen Mentawai berkisar antara  57,89 cm/s2 sampai 119,69 cm/s2. Kecamatan dengan percepatan tanah maksimum akibat gempa di wilayah interplate adalah Kecamatan Bungus Teluk Kabung yaitu berkisar antara 106,21 cm/s2 sampai 119,69 cm/s2  dengan intensitas gempa sebesar VI - VII MMI. Nilai percepatan tanah maksimum di Kota Padang akibat gempa di segmen intraplate wilayah Mentawai berkisar antara sebesar 830,38 cm/s2 sampai 956,75 cm/s2 yaitu di  Kecamatan Padang Selatan dan Padang Barat dan mengecil ke arah timur Kota Padang. Intensitas gempa Kota Padang akibat gempa intraplate adalah sekitar IX MMI. Dampak  gempa dengan intensitas IX  menimbulkan kondisi kerusakan yang parah yang ditandai dengan adanya gejala kerusakan pada struktur bangunan, dan muncul gejala likuifaksi di area alluvial atau pasir.

 

 

Kata kunci :  Gempa bumi, Intensitas, MMI, Percepatan tanah, interplate, intraplate           

 

Downloads

Download data is not yet available.

Downloads

Published

2017-09-01

How to Cite

Pujiastuti, D., Nofaslah, R., & Budiman, A. (2017). Estimasi Intensitas Gempa Bumi Dan Percepatan Tanah Maksimum Kota Padang Berdasarkan Data Historis Gempa 1976-2016 di Wilayah Mentawai. JURNAL ILMU FISIKA | UNIVERSITAS ANDALAS, 9(2), 110–120. https://doi.org/10.25077/jif.9.2.110-120.2017

Issue

Vol. 9 No. 2 (2017): September 2017

Section

Research Article

Citation Check

License

Please find the rights and licenses in JIF (Jurnal Ilmu Fisika).

1. License

The non-commercial use of the article will be governed by the Creative Commons Attribution license as currently displayed on Creative Commons Attribution-NonCommercial 4.0 International License.

2. Author's Warranties

The author warrants that the article is original, written by stated author(s), has not been published before, contains no unlawful statements, does not infringe the rights of others, is subject to copyright that is vested exclusively in the author and free of any third party rights, and that any necessary written permissions to quote from other sources have been obtained by the author(s).

3. User Rights

JIF's spirit is to disseminate articles published are as free as possible. Under the Creative Commons license, JIF permits users to copy, distribute, display, and perform the work for non-commercial purposes only. Users will also need to attribute authors and JIF on distributing works in the journal.

4. Rights of Authors

Authors retain the following rights:

  • Copyright, and other proprietary rights relating to the article, such as patent rights,
  • The right to use the substance of the article in future own works, including lectures and books,
  • The right to reproduce the article for own purposes, provided the copies are not offered for sale,
  • The right to self-archive the article.

5. Co-Authorship

If the article was jointly prepared by other authors, the signatory of this form warrants that he/she has been authorized by all co-authors to sign this agreement on their behalf, and agrees to inform his/her co-authors of the terms of this agreement.

6. Termination

This agreement can be terminated by the author or JIF upon two months's notice where the other party has materially breached this agreement and failed to remedy such breach within a month of being given the terminating party's notice requesting such breach to be remedied. No breach or violation of this agreement will cause this agreement or any license granted in it to terminate automatically or affect the definition of JIF.

7. Royalties

This agreement entitles the author to no royalties or other fees. To such extent as legally permissible, the author waives his or her right to collect royalties relative to the article in respect of any use of the article by JIF or its sublicensee.

8. Miscellaneous

JIF will publish the article (or have it published) in the journal if the article's editorial process is successfully completed and JIF or its sublicensee has become obligated to have the article published. JIF may conform the article to a style of punctuation, spelling, capitalization, referencing and usage that it deems appropriate. The author acknowledges that the article may be published so that it will be publicly accessible and such access will be free of charge for the readers.