نتایج جستجو برای: ensemble earthquake records
تعداد نتایج: 199700 فیلتر نتایج به سال:
We have developed a method to detect long-period precursors for large earthquakes observed in southern California, if they occur. The method allows us to continuously monitor seismic energy radiation over a wide frequency band to investigate slow deformation in the crust (e.g., slow earthquakes), especially before large earthquakes. We used the long-period records (1 sample/sec) from TERRAscope...
BACKGROUND A 7.0-magnitude earthquake hit Lushan County in China's Sichuan province on April 20, 2013, resulting in 196 deaths and 11,470 injured. This study was designed to analyze the characteristics of the injuries and the treatment of the seismic victims. METHODS After the earthquake, an epidemiological survey of injured patients was conducted by the Health Department of Sichuan Province....
Abstract. Earthquake-induced submarine slope destabilization is known to cause mass wasting and turbidity currents, but the hydrodynamic processes associated with these events remain poorly understood. Instrumental records are rare, this notably limits our ability interpret marine paleoseismological sedimentary records. An instrumented frame comprising a pressure recorder Doppler recording curr...
The Wigner-Ville Distribution (WVD) is a promising method for analyzing frequency variations in seismic signals, including those of interest for structural monitoring. Nonlinearities in the force displacement relationship will temporarily decrease the apparent natural frequencies of structures during strong to moderate excitation, and earthquake damage can permanently change building stiffnesse...
background : on december 26, 2003 an earthquake measuring 6.8 on the richter scale, shook the city of bam in the south east of iran and killed more than 40000 people and nearly 30000 were injured. this is an epidemiological study performed on the victims of bam earthquake to analyze different types of injuries of patients admitted in kerman hospitals. methods: in a retrospective cross-sectiona...
This study collects recorded ground motions from the near-source region of large earthquakes and considers to what extent this historic record can inform expectations of future ground motions at similar sites. The distribution of observed peak ground acceleration (PGA) is well approximated by the lognormal distribution, and we expect the observed distribution to remain unchanged with the additi...
We extend the notion of waiting times for a point process to recurrent events in space-time. Earthquake B is a recurrence of a previous one, A, if no intervening earthquake happens after A and before B in the spatial disc centered on A with radius AB. The cascade of recurrent events, where each later recurrence to an event is closer in space than all previous ones, forms a sequence of records. ...
The records of multiple Love and Rayleigh waves of the Alaska earthquake of 1964 were recovered from the 30-100 seismograph records at the WWSSN stations. The seismograms were equalized to a propagation distance of 9rr/2 (equivalent to G5 and R5 at • -r/2). These seismograms were compared with synthetic seismograms for radiation pattern and amplitude to estimate various source parameters. The s...
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