Comparison of Ground Motion Atenuation Models for West Sumatra and Bengkulu regions based on distant Subduction Interface and Intraslab Earthquakes

SIDIQ HARGO PANDADARAN

Penerbit : BMKG

Tahun : 2019

A ground acceleration map is needed as a consideration in building construction. Therefore, a good ground motion attenuation model is needed to predict the condition in the field properly. This study discusses ground motion attenuation models that are appropriate for West Sumatra and Bengkulu based on distant subduction interface and intraslab earthquakes from 9 attenuation models. The ground motion data in this study are from 13 Meteorological, Clima- tological, and Geophysical Agency‘s (BMKG) accelerograph sensors that are located in West Sumatra and Bengkulu regions from 2012 to 2017 with a distance of less than 1000 km from the earthquake sources, magnitude range of 4.1-6.4 for subduction interface earthquakes, and 4.1-6.5 for subduction intraslab earthquakes. The results show that the ground motion attenuation model from Kanno et al. (2006) has the best result with an RMSE value of 0.46 for subduction interface earthquakes and the model from Bernal et al. (2012) with RMSE value of 0.49 for subduction intraslab earthquakes.

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