## 1 Introduction  
The seismicity of the continental shelf of Malaysia is believed to be affected by its surrounding active faults and subduction zone. Malaysia is located on the Eurasian Plate and in the vicinity of two seismically-active plate boundaries. These boundaries are the inter-plate boundary between Eurasian and Philippine Plates on the east side while the inter-plate boundary is between the Indian-Australian and Eurasian Plates on the west side of Malaysia. Previous study highlighted that the Indian Ocean plate is moving at an estimated velocity of 7 cm/year toward the northeast and subducts under the Sumatra in the west of Malaysia [1]. Furthermore, the Philippine Plate is moving at an estimated 8 cm/year toward Malaysia, which might cause several micro-faults in Sabah. It was reported that Malaysia might be (and has been) affected by large tremor events in and around these boundaries [1]. In 2005, the nearest distance of the earthquake epicenter from Malaysia was approximately 350 km; this earthquake type could normally cause significant damage within a 100-200 km radius from the epicenter [2]. Even though Malaysia is out of the range,two large earthquakes near Sumatra, which occurred at the end of 2002 (Mw = 7.4) and in early 2003 (Mw = 5.8), caused tremors, which were felt by several cities in Peninsular Malaysia, including Penang and Kuala Lumpur. Few building cracks have been reported in Penang due to the 2002 Northern Sumatra earthquake [3]. After the fatal incident of the Sumatra Earthquake (M9.2) in 2004, the global seismicity patterns have been affected by other earthquake events that struck the East Indian Ocean on 11 April 2012, at M8.6. These earthquake events caused long-distance earthquake tremors or far-field effects, which could be felt, leading to panic in several cities in Peninsula Malaysia. Details of the seismicity around Java, Indonesia, was discussed in detail in previous research [4]. Despite its distance of the earthquake epicenter, Malaysia has a local epicenter (mainly in Sabah). Several possible active faults have been outlined and local earthquakes in East Malaysia seem to be related to some of them (seismic events from surroundings). Several possible active faults, such as the Mensaban and Loubo-Loubo, have been identified, and local earthquakes in East Malaysia seem to be related to some of these fault lines. From the observation based on the Modified Mercalli (MM) intensity scale, the maximum intensities for West and East Malaysia are VI and VII, respectively [1]. MM VI represents strong shaking, where shaking can be felt and cause slight damage, while VII represents very strong shaking, were negligible, and slight to moderate damage; damage can be seen in the structure depending on its design. PETRONAS Carigali Sdn. Bhd. (PCSB) has been entrusted to manage the hydrocarbon resources available in Malaysia. Operation areas offshore were divided into three, which are known as Peninsular Malaysia operation (PMO), Sabah operation (SBO), and Sarawak operation (SKO). There are many platforms available for offshore operation, such as a fixed-jacket platform, compliant tower, SPAR platform, and tension leg platform. However, all fixed-jacket platforms are widely used all over the world. This type of platform is meant for shallow water depths where the maximum depth is around 400 to 500 m [5]. The foundation of this platform has direct contact with the seabed. Thus, there is a need to determine the seismic microzonation map for the Malay Basin that can be used in the development and maintenance of offshore facilities. The Malay Basin as shown in Figure 1 is located in the South China Sea and consists of more than 150 hydrocarbon resource discoveries in 2003. The oil exploration started in the late 1960s; thus, numerous offshore facilities are available in the basin. The length and width of Malay Basin are about 500 and 200 km, respectively [6; 7; 8; 9]. The location of the Malay Basin is depicted, and the distribution of oil and gas fields is portrayed.