Insights into Preinstrumental Earthquake Data and Catalogs in Europe

2020 ◽  
Vol 91 (5) ◽  
pp. 2546-2553 ◽  
Author(s):  
Andrea N. Rovida ◽  
Paola Albini ◽  
Mario Locati ◽  
Andrea Antonucci
Keyword(s):  
European Archive ◽  
Historical Earthquake ◽  
Earthquake Parameters ◽  
Earthquake Catalogs ◽  
Reliability Parameters ◽  
Earthquake Effects ◽  
Large Earthquakes ◽  
Different Origin ◽  
Earthquake Data ◽  
Final Synthesis

Abstract In current catalogs, the parameters of preinstrumental earthquakes represent the final synthesis of earthquake records of very different type, quality, and reliability. Parameters may be derived from actual and contemporary observations of earthquake effects interpreted as intensity distributions or may be supplied by later seismological studies and descriptive catalogs, consisting of the reinterpretation of already interpreted accounts. The content of earthquake catalogs results from piling data of different origin, interpreted according to diverse approaches. Consequently, the homogeneity and reliability of earthquake parameters strongly vary from one region or period to another, and it is not as straightforward as assumed by end users. The analysis of the wealth of data in the European Archive of Historical Earthquake Data (AHEAD) evidences many differences in their typology and update of the studies supporting European preinstrumental earthquake catalogs, for both moderate and large earthquakes, over a period of 1000 yr.

Real-time seismology at UC Berkeley: The Rapid Earthquake Data Integration project

1996 ◽  
Vol 86 (4) ◽  
pp. 936-945 ◽  
Author(s):  
Lind S. Gee ◽  
Douglas S. Neuhauser ◽  
Douglas S. Dreger ◽  
Michael E. Pasyanos ◽  
Robert A. Uhrhammer ◽  
...  
Keyword(s):  
Data Integration ◽  
Strong Motion ◽  
Seismic Network ◽  
Prototype System ◽  
Earthquake Parameters ◽  
Moment Tensors ◽  
Automatic Information ◽  
Integration Project ◽  
Earthquake Data

Abstract The Rapid Earthquake Data Integration project is a system for the fast determination of earthquake parameters in northern and central California based on data from the Berkeley Digital Seismic Network and the USGS Northern California Seismic Network. Program development started in 1993, and a prototype system began providing automatic information on earthquake location and magnitude in November of 1993 via commercial pagers and the Internet. Recent enhancements include the exchange of phase data with neighboring networks and the inauguration of processing for the determination of strong-motion parameters and seismic moment tensors.

Two Bayesian Algorithms for the Estimation of Earthquake Parameters

2015 ◽  
Vol 31 (1) ◽  
pp. 565-578 ◽  
Author(s):  
J. P. Wang ◽  
Logan Brant
Keyword(s):  
Bayesian Approach ◽  
Technical Note ◽  
Earthquake Source ◽  
Sources Of Information ◽  
Multiple Sources ◽  
Earthquake Parameters ◽  
Distance Distributions ◽  
Real Earthquake ◽  
The Bayesian Approach ◽  
Earthquake Data

The purpose of the Bayesian approach is to integrate multiple sources of information into one final best-estimate with a unique algorithm, and a few applications have been developed for a variety of studies. This technical note provides two Bayesian algorithms for earthquake studies: the development of earthquake source-to-site distance distributions and the smoothing of earthquake rates in a region. In addition to the derivations, this note also provides demonstrations on the basis of real earthquake data to provide a better explanation of the two Bayesian algorithms proposed.

Spatial Variations of Seismic B-Values Distribution in China

2011 ◽  
Vol 71-78 ◽  
pp. 4819-4822
Author(s):  
Jie Xu ◽  
G. Lacidogna
Keyword(s):  
Material Properties ◽  
Heterogeneous Material ◽  
Spatial Variations ◽  
Shallow Depth ◽  
B Values ◽  
Large Earthquakes ◽  
Frequency Magnitude ◽  
Earthquake Data ◽  
Values Distribution

Seismic frequency-magnitude relationship has been investigated in China, based on the earthquake data in the range ofM3.0 toM7.0 during the years 1986-2008, to study the potential of variations ofb-values with the depth. According to the results, there is a systematic decrease inbvalue with increasing depth of earthquakes. At the shallow depth conditions, with more heterogeneous material properties and lower lithosphere stress prevail, rupture initiation is more likely to stop before accumulating into large earthquakes, producing relatively smaller earthquakes and consequently higherb-values. On the contrary, the larger earthquakes are more likely to happen at a greater depth.

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