He W.-G.,Lanzhou Institute of Seismology |
He W.-G.,Lanzhou Base of the Institute of Earthquake Science |
Yuan D.-Y.,Lanzhou Institute of Seismology |
Yuan D.-Y.,Lanzhou Base of the Institute of Earthquake Science |
And 4 more authors.
Earthquake | Year: 2010
Located in the middle and eastern segments of the Qilian Mountain active fault zone, Lenglongling active fault is an important part of the Qilian Mountain fault zone in the northeastern margin of the Tibetan plateau. Based on field investigation, we found that the fault has been intensely acting since Holocene, mainly represented by left-lateral strike-slip movement with normal dip-slip, and obvious dislocated geomorphological features. The location of faults was determined by processing the high-resolution SPOT satellite digital images and large-scale aerial photos. Using the dislocated geomorphological plotting, thermoluminescence (TL) and carbon 14 (14C) dating, the late Quaternary sliprate of the Lenglongling fault was accurately determined. The average horizontal slip-rate of the Lenglongling fault has been (4. 3 ± 0. 7) mm / a since the late Pleistocene, and (3. 9 ± 0. 36) mm / a since the late Holocene.
Wang Q.,China Earthquake Administration |
Wang H.-T.,China Earthquake Administration |
Wang H.-T.,Lanzhou Base of the Institute of Earthquake Science |
Tang C.-L.,China Earthquake Administration |
Song C.-Y.,China Earthquake Administration
Earthquake | Year: 2010
Using the method of multi-parametric moving maximum probability, we try to quantitatively identify and extract precursory anomalies from multi-parametric seismic data for the west section of southern Tianshan, Xinjiang. Through temporal-spatial scanning of spatial evolution process of multi-parametric moving maximum probability we obtained the spatial chracteristics of multi-parametric precursory anomalies before moderate-to-strong earthquakes in this region. It is found that for 10 (or group) moderate-to-strong earthquakes since 1980 in the region, there are great changes of multi-parametric moving maximum probabilty 1 to 2 years before the earthquakes in the epicentral area, and high anomaly areas gradually dissipate, decrease or disappear about 1 year after the earthquakes. Generally, there are no high anomaly area of moving maximum probabilty in quiet periods.