Based on the seismic observation report data provided by the Xinjiang Digital Seismic Network from 2009 to 2014,we calculate the wave velocity ratio and its background value for medium and small earthquakes by using t...Based on the seismic observation report data provided by the Xinjiang Digital Seismic Network from 2009 to 2014,we calculate the wave velocity ratio and its background value for medium and small earthquakes by using the multi-station method in Tianshan,Xinjiang.This paper analyzes the variation of the wave velocity ratio disturbance value to highlight the abnormal,and also back-traces 7 moderate earthquakes at the research area.The results show that:(1)the background value of the wave velocity ratio is almost 1.70,the wave velocity ratio obviously decreases in the middle-eastern part of Tianshan and the region near the Puchang fault;(2)the wave velocity ratio disturbance value is mostly low in the epicenter before four earthquakes of M≥5.0 from 2011 to 2013 in the study area;(3)before 7 moderate strong earthquakes,the earthquake events with low value of the wave velocity ratio account for over 60% of corresponding total events near the epicenters,and the low value of the wave velocity ratio is relatively obvious before moderate earthquakes.展开更多
An analysis of the value of classroom observation for both the teacher being observed and the observer. 1. Introduction I have been a teacher for nearly two years. I did not like classroom observation until a week bef...An analysis of the value of classroom observation for both the teacher being observed and the observer. 1. Introduction I have been a teacher for nearly two years. I did not like classroom observation until a week before. It hasbeen teaching practice on an advanced teacher training course that has made me change my mind. Now I want to be observed when I have difficulties or want to try something new. Here I shall discuss the展开更多
基金funded by the Earthquake Science Fund of Xinjiang (201404)Seismic Tracing Oriented Task of China Earthquake Administration(2015010122)
文摘Based on the seismic observation report data provided by the Xinjiang Digital Seismic Network from 2009 to 2014,we calculate the wave velocity ratio and its background value for medium and small earthquakes by using the multi-station method in Tianshan,Xinjiang.This paper analyzes the variation of the wave velocity ratio disturbance value to highlight the abnormal,and also back-traces 7 moderate earthquakes at the research area.The results show that:(1)the background value of the wave velocity ratio is almost 1.70,the wave velocity ratio obviously decreases in the middle-eastern part of Tianshan and the region near the Puchang fault;(2)the wave velocity ratio disturbance value is mostly low in the epicenter before four earthquakes of M≥5.0 from 2011 to 2013 in the study area;(3)before 7 moderate strong earthquakes,the earthquake events with low value of the wave velocity ratio account for over 60% of corresponding total events near the epicenters,and the low value of the wave velocity ratio is relatively obvious before moderate earthquakes.
文摘An analysis of the value of classroom observation for both the teacher being observed and the observer. 1. Introduction I have been a teacher for nearly two years. I did not like classroom observation until a week before. It hasbeen teaching practice on an advanced teacher training course that has made me change my mind. Now I want to be observed when I have difficulties or want to try something new. Here I shall discuss the
