New Attenuation Relationship for Peak Ground and Pseudo-Spectral Acceleration of Normal-Faulting Earthquakes in Offshore Northeast Taiwan

Abstract

Ground motions from normal-faulting earthquakes are generally considered to be smaller than those of strike-slip and thrust events. On 11 April 2011 a crustal normal-faulting earthquake [the Fukushima earthquake (M w 6.6)] occurred in Eastern Japan. The peak ground acceleration (PGA) observed was considerably higher than the predictions of several ground-motion prediction equations (GMPEs), which were derived mainly from thrust or strike-slip earthquakes. In northeast Taiwan, the tectonic structure of the Ryukyu Arc and the Okinawa Trough typically entail normal-faulting earthquakes. Because of the normal-faulting earthquakes relevance to ground motions and nuclear power plant sites in northeast Taiwan, we evaluated the impact of the ground motion of normal-faulting earthquakes in offshore northeast Taiwan using a newly constructed attenuation relationship for PGA and pseudo-spectral acceleration (Sa). We collected 832 records from 13 normal-faulting earthquakes with focal depths of less than 50 km. The moment magnitude (M w ) of the 13 events was between 4 -6. The Sa and PGA of normal-faulting earthquakes offshore northeast Taiwan determined with the newly constructed attenuation relationship were higher and lower, respectively, than those obtained using attenuation equations commonly used in the Taiwan subduction zone.

A horizontal ground-motion model for crustal and subduction earthquakes in Taiwan

“…Several ground-motion models have been proposed for Taiwan over the past decade (Chang et al, 2001, 2012; Chen and Tsai, 2002; Chung, 2006; Jean et al, 2006; Kao et al, 2010; Lin et al, 2011a, 2011b; Lin and Lee, 2008; Liu et al, 2013, 2014; Liu and Tsai, 2005, 2015; Loh et al, 1991; Niazi and Bozorgnia, 1991, 1992; Sokolov et al, 2010; Tavakoli and Pezeshk, 2007; Tsai et al, 2006; Wang et al, 2004, 2016; Wu et al, 2001). However, these models have limited engineering applications for PSHA for the following reasons:…”

The Identification of Earthquake Shake Levels in Palu City Based on Mw 6,8 Shakemap Scenario by Palu Koro Fault

“…The authors input these parameters into the BMKG Shakemap application to obtain a "Shakemap" shock level impact map (Figure 9). For a comparison model with scenario earthquake parameters, ground-motion empirical equations are used according to [19] in equation ( 1). According to [32] the equation for calculating the PGA value in units of g is as follows:…”

Identifikasi Tingkat Getaran Gempa di Kabupaten Sigi Berdasarkan Skenario Shakemap Mw 6,9 Sesar Palu Koro

“…Selanjutnya penulis menginput parameter tersebut pada aplikasi Shakemap BMKG untuk mendapatkan peta dampak tingkat guncangan "Shakemap" (Gambar 10). Untuk model pembanding dengan parameter gempa skenario Mw 6,9, digunakan persamaan empiris ground-motion menurut [11]:…”

“…Gambar 10. Peta Skenario dampak guncangan Gempabumi di Kabupaten Sigi dengan Skala MMI Jika parameter skenario gempa digunakan menggunakan persamaan menurut [11]. maka diperoleh data sebagai berikut: Gambar 11.…”