Ground Motion Parameters and Resonance Effect During Strong Earthquake in Northern Thailand
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ORIGINAL PAPER
Ground Motion Parameters and Resonance Effect During Strong Earthquake in Northern Thailand Lindung Zalbuin Mase
. Suched Likitlersuang
. Tetsuo Tobita
Received: 22 March 2020 / Accepted: 23 October 2020 Ó Springer Nature Switzerland AG 2020
Abstract Several previous investigations have suggested that ground motion as described by various parameters and resonance effects could have contributed to the damage observed during an earthquake. This paper presents a ground motion parameters study and site investigation in Northern Thailand during the Tarlay Earthquake of 2011. Ground motion parameters recorded at the closest seismic station to the earthquake rupture, i.e. Mae Sai Station (MSAA) are studied. Microtremor measurement was performed at the MSAA site. The horizontal to vertical spectral ratio (H/V) from the investigation are interpreted. Spectral acceleration ratios based on data from the MSAA are compared to determine the possibility of resonance during the earthquake. Spectral acceleration data based on recorded ground motion are compared to
guideline design spectral acceleration to determine the critical period. Results show that during the Tarlay Earthquake, significant duration was 24 s. Within this duration, resonance was plausible within the frequency range of 1.82 to 2.1 The critical period ranged from 0.4 to 0.6 s, indicating that low-medium story buildings were most vulnerable. Results also show that horizontal ground motion was relatively dominant in the destruction of structural buildings during the earthquake. Keywords Ground motion Microtremor Resonance Northern Thailand Tarlay Earthquake
1 Introduction L. Z. Mase Department of Civil Engineering, Faculty of Engineering, University of Bengkulu, Bengkulu 38371, Indonesia e-mail: [email protected] S. Likitlersuang (&) Department of Civil Engineering, Centre of Excellence in Geotechnical and Geoenviromental Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand e-mail: [email protected] T. Tobita Department of Civil, Environmental, and Applied System Engineering, Kansai University, Osaka, Japan e-mail: [email protected]
Chiang Rai Province is a well-known trade and tourist zone in Northern Thailand which experienced an economic boom in the 1980s. Unfortunately, earthquake threats have become a pressing issue in this area. A recent significant earthquake that took place in Northern Thailand on March 24, 2011 was the 6.8 Mw Tarlay Earthquake positioned near the ThailandMyanmar border. This earthquake resulted in very serious damage, especially in Mae Sai District, Chiang Rai Province, Northern Thailand (Fig. 1), 33 km from the earthquake’s epicentre. The hypocentre was located at 20.705 N, 99.949E with the focal depth of
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Fig. 1 Area of study, epicentre of Tarlay Earthquake, and surrounding active faults. Modified from Google Earth (2016)
10 km below ground surface (Phodee et al. 2015). Mae Sai District is also the mos
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