seismic space-time transformation of the periphery of the Ordos block

Abstract:

Ordos block is located on the eastern edge of the north-south seismic belt, northeastern margin of the Qinghai-Tibet Plateau, the transfer of three plates of north China, south China and Qinghai-Tibet. Its internal structure is stable, on which earthquakes rarely occur, but the periphery has strong new tectonic movements on it. Research on the periphery of Ordos block seismic activity and transformation of time and space carried out new ideas of earthquake prediction for the area. This paper plots Ordos earthquake catalog data according to existing data, combined with the distribution of active tectonics, using GIS tools statistical regularity, analyze the seismic migration characteristics, earthquake recurrence interval, and predict future earthquake risk zone. In combination of the transformation of spatial and temporal periphery of the Ordos block seismic activity, we draw a conclusion : 1.The moderate earthquakes migrate from the northeastern margin to the southwestern margin of the Ordos, different magnitude earthquakes have different migration cycles. 2.The intensity of the periphery of the seismic activity was significantly higher than the north and south edge, but the north and south edge has higher risk of large earthquake. 3. Different earthquake fault zones has different migration of earthquakes, existing on the same directional migration, and migration between different fault zone.

Key words: Ordos block; Seismic time-space transformation; earthquake tectonic movement.