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- Probabilistic earthquake location in 3D and layered models
- Probabilistic Earthquake Location in 3D and Layered Models
Many countries have deployed dense seismic networks to monitor induced seismicity and to obtain information about the seismic source physics, reservoir structure and ground motions. For example, in one gas field in Europe, more than 3-component seismic sensors have been installed to monitor induced seismicity continuously.
The Somma—Vesuvius volcanic complex and surroundings are characterized by topographic relief of over m and strong 3-D structural variations. This complexity has to be taken into account when monitoring the background volcano seismicity in order to obtain reliable estimates of the absolute epicentres, depths and focal mechanisms for events beneath the volcano. We have developed a 3-D P -wave velocity model for Vesuvius by interpolation of 2-D velocity sections obtained from non-linear tomographic inversion of the Tomoves and active seismic experiment data.
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Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: Lomax and A. Michelini and A. Lomax , A. Michelini , A. Curtis Published Geology. Arrival time The time of the first measurable energy of a seismic phase on a seismogram. Centroid The coordinates of the spatial or temporal average of some characteristic of an earthquake such as surface shaking intensity or moment release.
Data space If the data are described by a vector d, then the data spaceD is the set of all possible values of d. Direct search A search or inversion technique that does not explicitly use derivatives.
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Earthquake location methods. Bayesian historical earthquake relocation: an example from the Taipei earthquake. View 2 excerpts, cites methods. Linear and nonlinear earthquake location approaches in a case study overview. Highly Influenced. View 7 excerpts, cites background and methods.
Data processing of induced seismicity : estimation of errors and of their impact on geothermal reservoir models. Focusing patterns of seismicity with relocation and collapsing. View 1 excerpt, cites background. Improving Seismic Surveillance at Mt. Seismic response to deep injection changes at Rotokawa geothermal field , New Zealand. View 5 excerpts, cites methods. View 2 excerpts, cites background. Real-time evolutionary earthquake location for seismic early warning.
Probabilistic earthquake location in 3D and layered models
Advances in Seismic Event Location pp Cite as. Probabilistic earthquake location with non-linear, global search methods allows the use of 3D models and produces comprehensive uncertainty and resolution information represented by a probability density function over the unknown hypocentral parameters. We describe a probabilistic earthquake location methodology and introduce an efficient Metropolis-Gibbs, non-linear, global sampling algorithm to obtain such locations. Using synthetic travel times generated in a 3D model, we examine the locations and uncertainties given by an exhaustive grid-search and the Metropolis-Gibbs sampler using 3D and layered velocity models, and by a iterative, linear method in the layered model. We also investigate the relation of average station residuals to known static delays in the travel times, and the quality of the recovery of known focal mechanisms. With the 3D model and exact data, the location probability density functions obtained with the Metropolis-Gibbs method are nearly identical to those of the slower but exhaustive grid-search.
Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: Chiu and J. Yeh and S. Traditional local-earthquake location using a horizontally layered homogeneous velocity model is limited in its resolution and reliability due to the existence of frequently overlooked 3D complexity of the real Earth. During traditional 3D seismic tomography, simultaneous earthquake relocation using the resultant 3D velocity model has produced reliable earthquake locations; however, only a small subset of events are typically used and thus relocated in the inversion.
This electronic supplement contains text, tables, and figures associated with our estimation of the 27 August and 4 September earthquake epicenters using the earthquake location code NonLinLoc NLL; Lomax et al. We verified these data against scanned bulletins in Schweitzer and Lee and found no discrepancies. The scanned bulletins do contain several additional observations that we tested. Rather than including the additional arrival times [some of which could be bad], we opted to use only the data in the ISC database. In this section, we discuss the phase identification and arrival times for the two closest stations, Sitka and Victoria Fig.
Probabilistic earthquake location with non-linear, global search methods allows the use of 3D models and produces comprehensive uncertainty and resolution.
Probabilistic Earthquake Location in 3D and Layered Models
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Probabilistic earthquake location with non-linear, global-search methods allows the use of 3D models and produces comprehensive uncertainty and resolution information represented by a probability density function PDF over the unknown hypocentral parameters. We describe a probabilistic earthquake location methodology and introduce an efficient Metropolis-Gibbs, non-linear, global sampling algorithm to obtain such locations. Using synthetic travel times generated in a 3D model we examine the locations and uncertainties given by an exhaustive grid-search and the Metropolis-Gibbs sampler using 3D and layered velocity models, and by a iterative, linear method in the layered model. We also investigate the relation of average station residuals to know static delays in the travel times, and the quality of the recovery of known focal mechanisms.
Geophysical seismic surveys have been applied to marine geo-site characterization to create images of the complex geological conditions under the seafloor. Accurate knowledge of the ground conditions is critical for geo-risk assessment purposes such as mapping shallow gas hydrate deposits, over-pressured zones, or geological anomalies. Traditional seismic reflection profiling is a relatively fast and flexible method of processing seismic data to recover information on the spatial variation in facies boundaries and subsurface structure.
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