Development of Time Histories Based on Shallow Crustal Earthquake Sources Considering the New Version of the Indonesian Earthquake Map

Abstract

Earthquake disasters are widespread in Indonesia, and one of the areas that frequently experiences earthquakes is Yogyakarta. Many buildings have experienced minor to severe damage during an earthquake. Given this reason, the building design should consider earthquake loads from spectral responses; however, there is the difficulty of getting time history data. In the latest earthquake map, the return period earthquake changes from the 475 to 2475 years made the old buildings comply with the new code. A research object that was selected in this study is the Alana Yogyakarta Hotel. This study examines the changes in time history's value based on shallow crustal earthquake sources using Probabilistic Seismic Hazard Analysis (PSHA). Earthquake events around Yogyakarta were collecting from various sources. In hazard analysis requires the distinction between the mainshock, foreshock, and aftershock. This study's attenuation function was selected based on the similarity of Indonesia's geological and tectonic conditions. A reference to select the time history data is the dominant distance and dominant magnitude from hazard deaggregation analysis. The spectral matching process was carried out to equalize the spectral response value in the study area of time history. The resulting time history is artificial. The results showed that the old code's peak acceleration value is smaller than in the new code.