Earthquake frequency and moment magnitude relations for mainshocks, foreshocks and aftershocks: Theoretical b values
نویسندگان
چکیده
منابع مشابه
Values for Foreshocks and Aftershocks in Real and Simulated Earthquake Sequences by L. Knopoff,
The differences in b values between foreshock and aftershock sequences can be shown to be a statistically significant property of real earthquake sequences if a sufficiently large number of cases is considered, i.e., if the catalogs are long enough. These differences depend on the particulars of the data processing procedures used to define the sequences, such as space-time windowing and defini...
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The San Andreas fault is the longest fault in California and one of the longest strike-slip faults anywhere in the world, yet we know little about many aspects of its behavior before, during, and after large earthquakes. We conducted a study to locate and to estimate magnitudes for the largest foreshocks and aftershocks of the 1857 M 7.9 Fort Tejon earthquake on the central and southern segment...
متن کاملMainshocks are Aftershocks of Conditional Foreshocks: How do Foreshock Statistical Properties Emerge from Aftershock Laws
The inverse Omori law for foreshocks discovered in the 1970s states that the rate of earthquakes prior to a mainshock increases on average as a power law ∝ 1/(tc − t) p ′ of the time to the mainshock occurring at tc. Here, we show that this law results from the direct Omori law for aftershocks describing the power law decay ∼ 1/(t − tc) p of seismicity after an earthquake, provided that any ear...
متن کاملThe spatial density of foreshocks
[1] Aftershocks follow a well‐defined spatial decay pattern in the intermediate field. Here I investigate the same pattern for foreshocks. Foreshock linear density decays as r over distances r of 0.1–30 km for 15 minutes before magnitude 3–4 mainshocks. This trend is the same as that of the aftershocks within the error of the measurement. This consistency of spatial decay can be explained by th...
متن کاملA Common Origin for Aftershocks , Foreshocks , and Multiplets
We demonstrate that the statistics of earthquake data in the global Centroid Moment Tensor (CMT) and National Earthquake Information Center (NEIC) catalogs and local California Council of the National Seismic System (CNSS) catalog are consistent with the idea that a single physical triggering mechanism is responsible for the occurrence of aftershocks, foreshocks, and multiplets. Specifically, w...
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ژورنال
عنوان ژورنال: Episodes
سال: 1997
ISSN: 0705-3797,2586-1298
DOI: 10.18814/epiiugs/1997/v20i3/006