Array Seismology Advances Research Into Earth`s Interior
... possible scale lengths using array methods. In fact, seismic array techniques are often necessary for retrieval of subtle, yet important, deep Earth seismic structures, particularly those containing fine-scale features. While only a handful of investigations over the past few decades have used tradi ...
... possible scale lengths using array methods. In fact, seismic array techniques are often necessary for retrieval of subtle, yet important, deep Earth seismic structures, particularly those containing fine-scale features. While only a handful of investigations over the past few decades have used tradi ...
Slab temperature controls on the Tonga double
... with CMT solutions, the waveforms have lower signal-to-noise ratios and limited bandwidth; thus, it is difficult to determine reliable focal mechanisms. The analysis of waveform similarity suggests that the seismogenic zone along C-C′ can be roughly divided into two layers, so that most of the upper ...
... with CMT solutions, the waveforms have lower signal-to-noise ratios and limited bandwidth; thus, it is difficult to determine reliable focal mechanisms. The analysis of waveform similarity suggests that the seismogenic zone along C-C′ can be roughly divided into two layers, so that most of the upper ...
Chapter F5
... • Modified Mercalli Intensity Scale A measure of the degree to which an earthquake is felt by people and the damage it caused is called intensity. • Currently, seismologists use the Modified Mercalli Intensity Scale to measure earthquake intensity. This is a numerical scale that uses Roman numerals ...
... • Modified Mercalli Intensity Scale A measure of the degree to which an earthquake is felt by people and the damage it caused is called intensity. • Currently, seismologists use the Modified Mercalli Intensity Scale to measure earthquake intensity. This is a numerical scale that uses Roman numerals ...
Texte intégral View
... Abstract In this work, we use the magnetotelluric (MT) method to detect geoelectrical conductivity anomalies in the Earth’s crust and link them to local seismic activity. This application affords the unusual opportunity to study the percolation of water from a lake into a fault system and its effect ...
... Abstract In this work, we use the magnetotelluric (MT) method to detect geoelectrical conductivity anomalies in the Earth’s crust and link them to local seismic activity. This application affords the unusual opportunity to study the percolation of water from a lake into a fault system and its effect ...
36. Bandaisan
... beneath the summit. No significant ground deformation corresponding to this seismic activity was observed, nor were changes in surface phenomenon observed. Slightly high level of seismic activity. There continued to be low-frequency, very-long-period, and deep low-frequency earthquakes, as well as v ...
... beneath the summit. No significant ground deformation corresponding to this seismic activity was observed, nor were changes in surface phenomenon observed. Slightly high level of seismic activity. There continued to be low-frequency, very-long-period, and deep low-frequency earthquakes, as well as v ...
evidences of active faulting in thrace region (north
... total displacement (about 70%) must be expressed in the horizontal sense. Nevertheless, for a most accurate approach of the expected displacements, the implementation of a detailed study is considered necessary for each fault, co-evaluating also the behavior of the geological material. ...
... total displacement (about 70%) must be expressed in the horizontal sense. Nevertheless, for a most accurate approach of the expected displacements, the implementation of a detailed study is considered necessary for each fault, co-evaluating also the behavior of the geological material. ...
The mechanism of intraplate earthquakes: insights from geodynamic
... the far-field loading(Figure 8), and reaches the new lower fault strength and causes a second fault rupture (Figure 8) in 1800 years. Because no further fault weakening occurs, it then takes another 3000 years for the fault zone to rupture again (Figure 9a). In the second scenario, the strength of t ...
... the far-field loading(Figure 8), and reaches the new lower fault strength and causes a second fault rupture (Figure 8) in 1800 years. Because no further fault weakening occurs, it then takes another 3000 years for the fault zone to rupture again (Figure 9a). In the second scenario, the strength of t ...
Strain accumulation in and around Ou Backbone Range, northeastern Japan... observed by a dense GPS network
... A dense GPS network was established in 1997 around Ou Backbone Range (OBR), northeastern Japan, by deploying 28 continuous GPS stations to complement the sparse portion of GEONET operated by the Geographical Survey Institute of Japan. The aim of the network is to investigate the present surface defo ...
... A dense GPS network was established in 1997 around Ou Backbone Range (OBR), northeastern Japan, by deploying 28 continuous GPS stations to complement the sparse portion of GEONET operated by the Geographical Survey Institute of Japan. The aim of the network is to investigate the present surface defo ...
Seismic structure of the lithosphere and upper mantle
... al., 1997, etc.). However, geophysical studies, which help in constraining the existing models, are quite limited. The most important geophysical study aimed at deciphering the melt generation was the MELT experiment (Forsyth, 1992). Results from inversion of Love wave dispersion data from the East ...
... al., 1997, etc.). However, geophysical studies, which help in constraining the existing models, are quite limited. The most important geophysical study aimed at deciphering the melt generation was the MELT experiment (Forsyth, 1992). Results from inversion of Love wave dispersion data from the East ...
Electric field and infrared radiation in the troposphere
... electric field by earthquakes have been observed for thousands of years before strong seismic events (Derr, 1973; Fidani, 2010; Grigoriev et al., 1988; Hedervari and Noszticzius, 1985; Sobolev and Demin, 1980). But luminous phenomena before earthquakes occur rather seldom. According to historical so ...
... electric field by earthquakes have been observed for thousands of years before strong seismic events (Derr, 1973; Fidani, 2010; Grigoriev et al., 1988; Hedervari and Noszticzius, 1985; Sobolev and Demin, 1980). But luminous phenomena before earthquakes occur rather seldom. According to historical so ...
Northern Houtman Sub-basin prospectivity
... BOREHAM, C.J., JORGE NSEN, D.C. AND ROBERSTON, D., 2011—New exploration opportunities in the offshore northern Perth Basin. The APPEA Journal, 51, 45–78. SYMONDS, P. A., PLANKE, S., FREY, O. AND SKOGSEID, J., 1998—Volcanic evolution of the Western Australian continental margin and its implications f ...
... BOREHAM, C.J., JORGE NSEN, D.C. AND ROBERSTON, D., 2011—New exploration opportunities in the offshore northern Perth Basin. The APPEA Journal, 51, 45–78. SYMONDS, P. A., PLANKE, S., FREY, O. AND SKOGSEID, J., 1998—Volcanic evolution of the Western Australian continental margin and its implications f ...
Long-period ground motion simulation in the Kinki area during the... 7.1 foreshock of the 2004 off the Kii peninsula earthquakes
... Philippine Sea slab, crust, and sedimentary wedge. Our 3D propagation-path model with an appropriate source model reproduces well the observed long-period ground motions at several rock sites in the Kinki area. We also found that the sedimentary wedge amplifies and extends the duration of long-perio ...
... Philippine Sea slab, crust, and sedimentary wedge. Our 3D propagation-path model with an appropriate source model reproduces well the observed long-period ground motions at several rock sites in the Kinki area. We also found that the sedimentary wedge amplifies and extends the duration of long-perio ...
Dynamic parameters of structures extracted from ambient
... solving the inverse problem [21], based on the knowledge of the modal parameters. ...
... solving the inverse problem [21], based on the knowledge of the modal parameters. ...
Seismic structures of the 154–160 Ma oceanic crust and uppermost... in the Northwest Pacific Basin
... just below the Moho, whose depth was well constrained by a number of clear Pm P arrivals. However, the calculated Pn travel times were shorter than the ones observed in this model, and the offsets of 30–40 km where the Pn appears as a first arrival on the observed record sections are smaller than th ...
... just below the Moho, whose depth was well constrained by a number of clear Pm P arrivals. However, the calculated Pn travel times were shorter than the ones observed in this model, and the offsets of 30–40 km where the Pn appears as a first arrival on the observed record sections are smaller than th ...
Dynamic Soil Pressures on Embedded Retaining Walls: Predictive
... exerted force on the wall. Response spectra in Figure 6 (b) at Z = 0 m correspond to the location at top of the failure wedge, and the spectra at Z = -5 m correspond to the location at the bottom of the excavation. It is clear how the spectrum at Z = 0 m has lower spectral acceleration than the othe ...
... exerted force on the wall. Response spectra in Figure 6 (b) at Z = 0 m correspond to the location at top of the failure wedge, and the spectra at Z = -5 m correspond to the location at the bottom of the excavation. It is clear how the spectrum at Z = 0 m has lower spectral acceleration than the othe ...
Laser Interferometric Sensor for seismic waves velocity
... their results are in good agreement over the frequency range extending from approximately 1 cycle · month−1 to several cycles · sec−1 . Therefore, it seems reasonable to assume that their results represent a reasonable estimate of the earth noise. There are many kinds of instruments adequate for the ...
... their results are in good agreement over the frequency range extending from approximately 1 cycle · month−1 to several cycles · sec−1 . Therefore, it seems reasonable to assume that their results represent a reasonable estimate of the earth noise. There are many kinds of instruments adequate for the ...
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.