On the linear relation between m_b and M_s for discrimination between explosions and earthquakes     

All A. Nowroozi 《Geophysical Journal International》1986,86(2):687-699

Summary. The statistical capability of the m _b: M _s discriminant for the discrimination of earthquake and explosion populations is examined by application of discriminant functions to a group of 83 explosions and 72 earthquakes in Eurasia. Equations are derived for the probability that an event is an earthquake or an explosion. The positive sign of DIS in the decision index equation, DIS _i = 34.3383 – 11.9569 mb _t + 7.1161 M _si , indicates that the event i is an earthquake. Its negative sign indicates that event i is an explosion. The probability of correct classification for an event, P _i , is related to its DIS _i value, by P _i = [1-exp (DIS _i )]⁻¹, where a large, positive DIS indicates a high probability that an event is an earthquake and a large, negative DIS indicates a high probability that an event is an explosion. The discrimination line M _s = 1.680 m _b– 4.825, or m _b= 0.595 M _s+ 2.872 very successfully separates the explosion population from the earthquake population. The points on this line have an equal chance of being an earthquake or an explosion; moreover, for any event, the distance parallel to the M _s-axis from the point representing that event in the m _b: M _s plane to this line is a measure of the probability for the correct classification of that event.  相似文献   

Coda Q In the Eastern Caribbean, West Indies   总被引：1，自引：0，他引：1  

W. B. Ambeh  L. L. Lynch 《Geophysical Journal International》1993,112(3):507-516

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Likelihood analysis of earthquake catalogues   总被引：5，自引：0，他引：5  

Y. Y. Kagan 《Geophysical Journal International》1991,106(1):135-148

We apply several classes of stochastic multidimensional models to statistical analysis of earthquake catalogues using likelihood methods. We investigate the importance of including different earthquake parameters in the model: epicentral coordinates, hypocentral depth, time limits for interearthquake interaction, and especially spatial distribution of earthquakes as well as spatial aftershock patterns. Results of this study combined with other investigations, suggest that most distributions controlling earthquake interaction have a fractal or scale-invariant form. Developed models are used for statistical analysis of several earthquake catalogues to evaluate parameters of earthquake occurrence. These parameters are shown to be similar for shallow earthquakes of different magnitude ranges and seismogenic regions, confirming self-similarity of the earthquake process. Whereas intermediate earthquakes seem to emulate the pattern of shallow earthquake occurrence, albeit at a much smaller aftershock rate, deep earthquakes differ significantly in their properties. Predictability of standard shallow earthquake catalogues has been analysed; we present evidence that for the best available catalogues the predictability is close to 10 bits per earthquake. Several synthetic earthquake catalogues have been created and processed through the likelihood inversion scheme. The results from likelihood analysis of these catalogues confirm our approach.  相似文献   

Earthquake hazard in the Kenya Rift: the Subukia earthquake 1928     

N. N. Ambraseys 《Geophysical Journal International》1991,105(1):253-269

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Undead earthquakes   总被引：1，自引：0，他引：1  

R.?M.?W.?MussonEmail author 《Journal of Seismology》2005,9(1):111-114

This short communication deals with the problem of fake earthquakes that keep returning into circulation. The particular events discussed are some very early earthquakes supposed to have occurred in the U.K., which all originate from a single enigmatic 18th century source.  相似文献   

Geothermal Structure in a Seismoactive Region of Central India     

S.R.?Sharmasrsharma@Yahoo.com" title="srs@ngri.res.in  srsharma@Yahoo.com" itemprop="email" data-track="click" data-track-action="Email author" data-track-label="">Email author  V.K.?Rao  D.M.?Mall  T.N.?Gowd 《Pure and Applied Geophysics》2005,162(1):129-144

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Aftershock zones of large shallow earthquakes: fault dimensions, aftershock area expansion and scaling relations   总被引：1，自引：0，他引：1  

C. Henry  S. Das 《Geophysical Journal International》2001,147(2):272-293

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Earthquake mechanisms in the Hellenic Trench near Crete   总被引：1，自引：0，他引：1  

T. Taymaz  J. Jackson  R. Westaway 《Geophysical Journal International》1990,102(3):695-731

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Geophysical evidence for ultrawide dykes of the late Carboniferous quartz-dolerite swarm of northern Britain   总被引：1，自引：0，他引：1  

David K. Smythe 《Geophysical Journal International》1994,119(1):20-30

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Pressure-related feedback processes in the generation of pseudotachylytes     

M. Bjrnerud  J.F. Magloughlin 《Journal of Structural Geology》2004,26(12):2317-2323

Pseudotachylyte formation is typically viewed as a self-limiting process. Quantitative models have demonstrated that frictional melting is possible at seismic slip rates, but once a thin film of melt forms on a seismic fault plane, the dramatic decrease in fault friction is thought to suppress further melting. Volumes of melt-generated pseudotachylyte observed in field studies, however, are in many cases substantially larger than the amounts of frictional melt predicted by theoretical models. This suggests that previously unrecognized physical processes may enhance melting during seismic slip. Localized decompression at dilational jogs may be one such phenomenon. Transient unloading could play two important roles in the dynamics of pseudotachylyte generation. First, by setting up significant fluid pressure gradients, it would lead to rapid migration of the melt to sites of low pressure, thereby reestablishing frictional contact across the fault surface and favoring further melt generation. Second, at significant depths, sudden depressurization might lead to in situ decompression melting.  相似文献