There are several long (150-200 kilometre) north-south trending faults; these are: the Mae Hong Son Fault at the eastern border, and the Mae Tha, Mae Yom and Uttaradit Faults at the centre. These faults join or are truncated by long (250 kilometre) northwest-southeast trending fault zones (MPF: Mae Ping Fault and TPF: Three Pagoda Fault) in the central part of Thailand (Fig.10b). In the southern part of the peninsular, there are several northeast-southwest trending faults (e.g.,KMF: Klong Marui Fault and RNF: Ranonog Fault) (Fig. 10b). The intraplate strike-slip earthquakes in Thailand are mostly around M=6.8, and these are typically shallower earthquakes (depth < 40 kilometre). The strong (M=6.0-6.8) and moderate (M=5.0-5.8) earthquakes in the intraplate region of Thailand shown in Fig.11b.