High resolution tsunami inversion for 2010 Chile earthquake
... Abstract. We investigate the feasibility of inverting highresolution vertical seafloor displacement from tsunami waveforms. An inversion method named “SUTIM” (small unit tsunami inversion method) is developed to meet this goal. In addition to utilizing the conventional least-square inversion, this p ...
... Abstract. We investigate the feasibility of inverting highresolution vertical seafloor displacement from tsunami waveforms. An inversion method named “SUTIM” (small unit tsunami inversion method) is developed to meet this goal. In addition to utilizing the conventional least-square inversion, this p ...
south Brittany - Site de Patrick Ledru
... This paper combines geological knowledge and geophysical imagery at the crustal scale to model the 3D geometry of a segment of the Hercynian suture zone of western Europe in the Champtoceaux area (Brittany, France). The Champtoceaux complex consists of a stack of metamorphic nappes of gneisses and m ...
... This paper combines geological knowledge and geophysical imagery at the crustal scale to model the 3D geometry of a segment of the Hercynian suture zone of western Europe in the Champtoceaux area (Brittany, France). The Champtoceaux complex consists of a stack of metamorphic nappes of gneisses and m ...
Integrated 3D geophysical and geological modelling of the
... This paper combines geological knowledge and geophysical imagery at the crustal scale to model the 3D geometry of a segment of the Hercynian suture zone of western Europe in the Champtoceaux area (Brittany, France). The Champtoceaux complex consists of a stack of metamorphic nappes of gneisses and m ...
... This paper combines geological knowledge and geophysical imagery at the crustal scale to model the 3D geometry of a segment of the Hercynian suture zone of western Europe in the Champtoceaux area (Brittany, France). The Champtoceaux complex consists of a stack of metamorphic nappes of gneisses and m ...
Foundering of lower island-arc crust as an explanation for the origin
... rocks can become density unstable with respect to the upper mantle over a significant depth interval from 20 to 60 km or more, depending on compositions and temperature conditions in the arc lower crust (see Methods for detailed discussion). Detailed knowledge of the composition and temperature regi ...
... rocks can become density unstable with respect to the upper mantle over a significant depth interval from 20 to 60 km or more, depending on compositions and temperature conditions in the arc lower crust (see Methods for detailed discussion). Detailed knowledge of the composition and temperature regi ...
Geodynamical interpretation of crustal and upper mantle electrical conductivity
... This conclusion was achieved proceeding from estimates of temperature-dependent P-wave velocities and attenuation in mantle rocks during studies of polarization anizotropy by SKS splitting measurements in the continental rifts of Baikal, East Africa and Rio Grande, in comparison to tomographic resul ...
... This conclusion was achieved proceeding from estimates of temperature-dependent P-wave velocities and attenuation in mantle rocks during studies of polarization anizotropy by SKS splitting measurements in the continental rifts of Baikal, East Africa and Rio Grande, in comparison to tomographic resul ...
extended basement beneath the intracratonic rifted basins of the
... beneath the so-called “acoustic” basement were made. Moreover, until recently it was believed that, except for a fortuitous situation, no penetration could be achieved in a deformed basement complex and thet metamorphic rocks were seismically transparent. An industry line b-b’ recorded over the Bona ...
... beneath the so-called “acoustic” basement were made. Moreover, until recently it was believed that, except for a fortuitous situation, no penetration could be achieved in a deformed basement complex and thet metamorphic rocks were seismically transparent. An industry line b-b’ recorded over the Bona ...
Spatial variations in the frequency
... model was obtained (Lin et al., 2006a, accepted), and all of the earthquakes were relocated using this 3-D velocity model. Only hypocenters determined at an accuracy lower than 10 km in the three directions were chosen for the FMD calculations. In total, 2823 earthquakes were relocated. After reloca ...
... model was obtained (Lin et al., 2006a, accepted), and all of the earthquakes were relocated using this 3-D velocity model. Only hypocenters determined at an accuracy lower than 10 km in the three directions were chosen for the FMD calculations. In total, 2823 earthquakes were relocated. After reloca ...
Long-term creep-rate changes and their causes
... 1994 – 2003). Note that the creep-rate changes increase toward the Loma Prieta quake location in the north, where the creep-rate is slower. The variation along the fault is even more dramatic for some other choices of time windows, e.g., those by Behr et al. [1997]. Such a decrease with distance fro ...
... 1994 – 2003). Note that the creep-rate changes increase toward the Loma Prieta quake location in the north, where the creep-rate is slower. The variation along the fault is even more dramatic for some other choices of time windows, e.g., those by Behr et al. [1997]. Such a decrease with distance fro ...
Tectonic re-interpretation of the Banggai
... Abstract: High resolution multibeam bathymetric and seismic data from the area north of the Banggai-Sula Islands, Indonesia, provide a new insight into the geological history of the boundary between the East Sulawesi ophiolite, the Banggai-Sula microcontinent and the Molucca Sea collision zone. Majo ...
... Abstract: High resolution multibeam bathymetric and seismic data from the area north of the Banggai-Sula Islands, Indonesia, provide a new insight into the geological history of the boundary between the East Sulawesi ophiolite, the Banggai-Sula microcontinent and the Molucca Sea collision zone. Majo ...
Crustal seismicity and the earthquake catalog maximum moment
... of positive dVS anomalies that correspond to thick lithospheric roots beneath cratons. In South America, SCR earthquakes commonly fall within the 0–2% dVS contours. Australian seismicity shows a somewhat weaker correlation with dVS contours, although numerous earthquakes are at the edge of the main ...
... of positive dVS anomalies that correspond to thick lithospheric roots beneath cratons. In South America, SCR earthquakes commonly fall within the 0–2% dVS contours. Australian seismicity shows a somewhat weaker correlation with dVS contours, although numerous earthquakes are at the edge of the main ...
SUPPRESSION OF SHORT-PERIOD MULTIPLES
... have reliable knowledge of the seismic wavelet. In our trial inversions in this paper, we started with reflection coefficients whose values were f0. I. A criterion for convergence of the least-squares inversion involves fitting the data with the model response. However, since this is a nonlinenr inv ...
... have reliable knowledge of the seismic wavelet. In our trial inversions in this paper, we started with reflection coefficients whose values were f0. I. A criterion for convergence of the least-squares inversion involves fitting the data with the model response. However, since this is a nonlinenr inv ...
Seismicity patterns and velocity structure of Katla volcano, Iceland
... follows that the b-value plot for this dataset does not show a straight line, but rather a soft bulge with no apparent sudden changes (Fig. 3). The dataset from within the Katla caldera shows a straight line and a b-value close to 1. It is thus not surprising that when a dataset including both areas ...
... follows that the b-value plot for this dataset does not show a straight line, but rather a soft bulge with no apparent sudden changes (Fig. 3). The dataset from within the Katla caldera shows a straight line and a b-value close to 1. It is thus not surprising that when a dataset including both areas ...
Seismic Refraction
... Like the DC resistivity method, seismic methods, as typically applied in exploration seismology, are considered active geophysical methods. In seismic surveying, ground movement caused by some source* is measured at a variety of distances from the source. The type of seismic experiment differs depen ...
... Like the DC resistivity method, seismic methods, as typically applied in exploration seismology, are considered active geophysical methods. In seismic surveying, ground movement caused by some source* is measured at a variety of distances from the source. The type of seismic experiment differs depen ...
Rupture Characteristics of the Deep Bolivian Earthquake of 9 June
... parallel to the inferred slab. Second, for this geometry the maximum compressive stress direction as inferred from the source mechanism of the Bolivian earthquake is downdip, the orientation most often found for deep focus events (19). The horizontal extent of the Bolivian earthquake is at least 50 ...
... parallel to the inferred slab. Second, for this geometry the maximum compressive stress direction as inferred from the source mechanism of the Bolivian earthquake is downdip, the orientation most often found for deep focus events (19). The horizontal extent of the Bolivian earthquake is at least 50 ...
Thematic Article Oceanic crust and Moho of the Pacific Plate in the
... Plateau, we have analyzed industry-standard two-dimensional multichannel seismic reflection data. To obtain improved velocity models, phase information of seismic signals was used for velocity analysis and velocity models for oceanic crust above Moho were determined. We apply this velocity analysis ...
... Plateau, we have analyzed industry-standard two-dimensional multichannel seismic reflection data. To obtain improved velocity models, phase information of seismic signals was used for velocity analysis and velocity models for oceanic crust above Moho were determined. We apply this velocity analysis ...
Earthquake engineering
Earthquake engineering or Seismic engineering is a branch of engineering that searches for ways to make structures, such as buildings and bridges, resistant to earthquake damage. Earthquake engineer, better known as a seismic engineer aim to develop building techniques that will prevent any damage in a minor quake and avoid serious damage or collapse in a major shake. It is the scientific field concerned with protecting society, the natural environment, and the man-made environment from earthquakes by limiting the seismic risk to socio-economically acceptable levels. Traditionally, it has been narrowly defined as the study of the behavior of structures and geo-structures subject to seismic loading; it is considered as a subset of both structural and geotechnical engineering. However, the tremendous costs experienced in recent earthquakes have led to an expansion of its scope to encompass disciplines from the wider field of civil engineering, mechanical engineering and from the social sciences, especially sociology, political science, economics and finance. The main objectives of earthquake engineering are: Foresee the potential consequences of strong earthquakes on urban areas and civil infrastructure. Design, construct and maintain structures to perform at earthquake exposure up to the expectations and in compliance with building codes.A properly engineered structure does not necessarily have to be extremely strong or expensive. It has to be properly designed to withstand the seismic effects while sustaining an acceptable level of damage.