This paper aims to study the Earth's temporal inertia moment and its influence on length of day (LOD). First, the GRACE data are processed by wavelet analysis to remove abnormal jumps and noises. Then the theoretical impacts of the second-order potential coefficients on the inertia moment and LOD are studied. Finally, the processed GRACE data are applied and results show that mass redistribution has led to decreasing tendencies of inertia moment and LOD as well as some unexpected seasonal oscillations in the recent 6 years.
The purpose of this study is to develop probabilistic seismic hazard maps for Yangon and its surrounding areas including ＇Peak Ground Acceleration＇ values for 2% and 10 % probability of the exceedance in 50 years at rock sites. The present study area is situated between the latitudes of N 13°37′ and N 20°2′＇ and the longitudes of E 93°35′ and E 99°5′. The study areas are focused on nine source zones centered around Yangon with the radius of about 200 km. The probabilistic seismic hazard maps are created by ArcGIS-9.3 software.
