HUBUNGAN KECEPATAN RELATIF PERGERAKAN LEMPENG DENGAN TINGKAT SEISMISITAS DI ZONA SUBDUKSI

Authors

  • Muzli Muzli Badan Meteorologi Klimatologi dan Geofisika (BMKG)

DOI:

https://doi.org/10.31172/jmg.v15i3.220

Keywords:

Kecepatan gerak lempeng, seismisitas, zona subduksi

Abstract

Perbedaan tingkat aktifitas gempabumi tektonik di zona subduksi dapat disebabkan oleh banyak faktor. Salah satu faktornya diduga akibat adanya pengaruh dari kecepatan relatif pergerakan lempeng. Studi terhadap hubungan antara kecepatan gerak lempeng dengan seismisitas dilakukan dengan menggunakan data gempabumi dan kecepatan relatif pergerakan lempeng pada beberapa zona subduksi di dunia. Jumlah data gempabumi diplot sebagai fungsi dari kecepatan relatif pergerakan lempeng. Hasil studi ini menunjukkan bahwa tingkat seismisitas gempabumi di zona subduksi dipengaruhi oleh kecepatan relatif pergerakan lempeng. Kedua parameter menunjukkan hubungan linear yang sangat baik dengan koefisien korelasi 0,98. Secara fisis hal ini menegaskan bahwa hukum kekekalan energi berlaku pada proses pergerakan lempeng di zona subduksi, dimana energi gerak lempeng berubah ke dalam bentuk pelepasan energi berupa gempabumi. Hasil studi ini juga menunjukkan bahwa jumlah gempabumi dengan magnitudo lebih besar dari 4 dan kedalaman lebih kecil dari 60 km dapat dihitung secara teoritis dengan menggunakan rumusan empiris.

 

Subduction zones are seismically the most active areas around the world. However, the seismicity rate among subduction zones is different. This can be caused by many reasons. One of them expected to be influenced by the relative plate velocity. Analysis of correlation between relative plate velocities and seismicity rate around subduction zones in the world has been done in this study. The correlation was analyzed by plotting the number of earthquake events as a function of relative plate velocities. The results show that the seismicity rate is linearly influenced by relative plate velocities with the correlation coefficient of 0,98. Physically it is asserted that the law of conservation of energy applies to the movement of the plates in subduction zones, where plate motion changed to energy in the form of energy release of earthquakes. The results of this study also showed that the number of earthquake events with a magnitude greater than 4 and depth less than 60 km follows our empirical equation.

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Published

2014-12-15

How to Cite

Muzli, M. (2014). HUBUNGAN KECEPATAN RELATIF PERGERAKAN LEMPENG DENGAN TINGKAT SEISMISITAS DI ZONA SUBDUKSI. Jurnal Meteorologi Dan Geofisika, 15(3). https://doi.org/10.31172/jmg.v15i3.220

Issue

Vol. 15 No. 3 (2014)

Section

Article

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