Relationship between seismicity and active faults in Thanh Hoa province detected by local seismic network

Thanh Hoa province belongs to the southwest part of Northwest Vietnam, which is considered a tectonically active region. In area province, there are three deep-seated tectonic faults, namely Son La-Bim Son, Song Ma, and Sop Cop. As predicted by scientists, these faults capable producing credible earthquakes that might be strongest in territory Vietnam. Besides main seismogenic sources, other smaller such as Thuong Xuan-Ba Thuoc Xuan-Vinh Loc but relationship with seismic activity still rather blurred. This may due sparseness Vietnamese National Seismic Network can not record adequately small area. paper presents new results additional monitoring from local network using 12 Guralp - 6TD broadband seismometers have been deployed since November 2009. We found seismically quiet. The average number recorded has reached 80 90 events per year some them magnitude ML 3.0 4.0.By integration earthquake epicenters derived distribution we detect several locating near only along also its subsidiary faults. focused on recent gravity, seismic, magnetotelluric data analyses. Several distribute two reach or greater scale. this study, recognized source. To identify hazard potential caused generated segmentation Xuan Ba fault had done based geological geomorphological indications activity, then peak ground acceleration was determined for each segment. Besides, large do good correlation specific fault, especially coastal plain, covered thick layers Neogene Quaternary sediment. shows hidden needed study further.