Developing new chemically recyclable polymers is highly demanded for establishing a circular plastics economy. The superior aliphatic-aromatic 5H-1,4-benzodioxepin-3(2H)-one (BDPO) system combined the high reactivity of aliphatic esters with the beneficial...
Using the technique of seismic moment tensor inversion, the source mechanisms of 10 earthquakes with Ms>_5.2 that occurred in China from November 1996 to January 1998 were determined rapidly. The determined results were sent as "Bulletins of Source Mechanism Parameters of Earthquakes" to the Seismic Regime Guards' Office, China Seismological Bureau, and the relevant provincial seismological bureaus. These bulletins have played role in the fast response to large earthquakes.
From August 21, 2000 to October 20, 2000 a fluid injection-induced seismicity experiment has been carried out in the KTB (German Continental Deep Drilling Program). The KTB seismic network recorded more than 2 700 events. Among them 237 events were of high signal-to-noise ratio, and were processed and accurately located. When the events were located, non KTB events were weeded out by Wadati's method. The standard deviation, mean and median were obtained by Jackknife's technique, and finally the events were accurately located by Geiger's method so that the mean error is about 0. I km. No earthquakes with focal depth greater than 9.3 km, which is nearly at the bottom of the hole, were detected. One of the explanation is that at such depths the stress levels may not close to the rock's frictional strength so that failure could not be induced by the relatively small perturbation in pore pressure. Or at these depths there may be no permeable, well-oriented faults. This depth may be in close proximity to the bottom of the hole to the brittle-ductile transition, even in this relatively stable interior of the interaplate. This phenomenon is explained by the experimental results and geothermal data from the superdeep borehole.
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