Based on the local earthquake data recorded by the Datong telemetric seismic network from 1989 to 1994,the 3 dimensional P wave velocity structure of the focal region and its nearby region of the Datong Yanggao M 6 1 earthquake(φ N39 5°～φ N40 4°,λ E112 5°～λ E114 4°)was inversed by thd algebraic reconstruction method,and the significance for revealing the seismogenic condition of the focal region was suggested.
On the basis of the focal mechanisms of 11 evevts with Ms≥4 and 98 small events in the Yongshan-Daguan,Yunnan,earthquake(Magnitude of the mainshock is Ms 7.1)sequence,the general patterns and variation of the stress field in source region have been discussed.
a gap segment of 150 km in length was formed around the epicenter; and quiescent anornaly with M≥3. 5 earthquakes appeared within 6 years of 1990~1995 in source area (△≤60 km).
It has been proposed in this paper that the event was caused, in microscopic view,by the left-lateral shear motion along the EW trending fault in the focal zone and, in macroscopic view,by the extreme rupture along the regional EW trending tectonics.
Besides, based on rotation feature of the Parkinson arrow in the interval of 1989～2001, the conductivity of the focal zone seems to be decreasing gradually.
It is indicated that the ambient stress approaching an earthquake is higher than that of usually small earthquakes (not near the focal zone of main earthquake) which form seismogenic gap at same period, and that the ambient stress of the small earthquakes near the focal zone of main earthquake is higher.
The function of thermal sources in the heat conduction equation was calculated according to the results of measuring the pressure distribution in the focal region of the heating transducer.
The source region experienced another rapid exhumation (1.05 mm/a) at 14.1 Ma, when the Tianshui basin began to depress broadly and fluvial-lacustrine sediments dominated the Late Miocene.
These findings support the ion-cyclotron mechanism of the Pc1 production suggesting that both wave generation and particle scattering occur in the source region.
The paleoseismogeological investigations performed in the source region of the 2003 earthquake have shown that seven seismic events with M = 7.0-8.0 occurred in its source over the last 5000 years with a 500-to 900-year recurrence period.
Thermochronologic study on the detrital apatite grains from sandstones at Yaodian, near Tianshui, has revealed two rapid tectonic uplift-exhumation events of the source area, which happened at 23.7 and 14.1 Ma, respectively.
One hour after the start of supplying the solutions, an assimilation clip chamber was fastened to the middle part of the shoot (14C source area), and 14CO2 was blown through in the light for 2.5 min.
In plants supplied with water or urea, 17-20% of labeled carbon was found below the 14C source area of the shoot, in nitrate type of treatment, only 3-5% was found there.
The general inference of our study is that 3He enrichment in the lower part of the Gams section is related not to cosmic matter but to a change in the conditions in the source area, most likely, to volcanic activity.
The lithosphere is shown to be strongly stratified in its velocity properties and laterally heterogeneous within the mantle wedge and seismic focal zone.
Results of investigation of the lithosphere in the Kamchatka seismic focal zone from dynamic characteristics of earthquake records obtained at regional stations are presented.
Until now TPE has only been accomplished for very small excitation areas of a few square micrometre dimensions since they are readily available in the focal zone of high-power lasers.
震源区
focal region
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