Tectonophysics_2009_Crustal and upper mantle velocity
... thickness varies between approximately 58 km under the northern part of Yunnan and 32 km beneath its southern border. A feature that should be emphasized is the existence of a 10 km-thick low velocity layer at 26–36 km depth. However, only simple information such as the average velocity and thicknes ...
... thickness varies between approximately 58 km under the northern part of Yunnan and 32 km beneath its southern border. A feature that should be emphasized is the existence of a 10 km-thick low velocity layer at 26–36 km depth. However, only simple information such as the average velocity and thicknes ...
- White Rose Research Online
... integrated with Getech gridded gravity onshore [Green and Fairhead, 1996]. Two-dimensional gravity modeling was performed using GM-SYSTM (Geosoft Inc.) version 7.0.1. The onshore and offshore sections of the 2-D profiles were modeled using the Bouguer and free air gravity anomalies, respectively. The ...
... integrated with Getech gridded gravity onshore [Green and Fairhead, 1996]. Two-dimensional gravity modeling was performed using GM-SYSTM (Geosoft Inc.) version 7.0.1. The onshore and offshore sections of the 2-D profiles were modeled using the Bouguer and free air gravity anomalies, respectively. The ...
Crustal structure beneath the Strait of Juan de Fuca and southern
... stations from northern Puget Sound. To reduce threedimensional effects, we ignored all arrivals with an offset less than 7 km. We kept 20 s of the signal of the vertical component of data with the time of the first sample controlled by offset and a reducing velocity of 8 km s 1. A Butterworth band-p ...
... stations from northern Puget Sound. To reduce threedimensional effects, we ignored all arrivals with an offset less than 7 km. We kept 20 s of the signal of the vertical component of data with the time of the first sample controlled by offset and a reducing velocity of 8 km s 1. A Butterworth band-p ...
Geological Structure and Time-Lapse Studies of CO2 Injection
... focus of this project is on testing and further developing monitoring CO2 storage technologies. For time-lapse seismic monitoring, three seismic surface sources were characterized with respect to S/N (signal to noise) ratios, signal penetration, and frequency content by analysis of raw shot gathers ...
... focus of this project is on testing and further developing monitoring CO2 storage technologies. For time-lapse seismic monitoring, three seismic surface sources were characterized with respect to S/N (signal to noise) ratios, signal penetration, and frequency content by analysis of raw shot gathers ...
Structural uplift beneath the Chicxulub impact structure
... Although meteorite impacts are a ubiquitous and fundamental geologic process affecting the terrestrial planets, the precise dynamics and kinematics of the processes involved in the formation of large impact craters are still poorly understood. Detailed knowledge of the geometric properties of the ce ...
... Although meteorite impacts are a ubiquitous and fundamental geologic process affecting the terrestrial planets, the precise dynamics and kinematics of the processes involved in the formation of large impact craters are still poorly understood. Detailed knowledge of the geometric properties of the ce ...
Continent-sized anomalous zones with low
... A number of high-resolution, forward modelling seismic studies have shown that shear waves travelling in the deep mantle near LLSVP edges become broadened and/or shifted in time2,5,9–11. This is consistent with a phenomenon called multi-pathing, where a seismic wave incident on strong heterogeneity ...
... A number of high-resolution, forward modelling seismic studies have shown that shear waves travelling in the deep mantle near LLSVP edges become broadened and/or shifted in time2,5,9–11. This is consistent with a phenomenon called multi-pathing, where a seismic wave incident on strong heterogeneity ...
A crustal model of the ultrahigh-pressure Dabie Shan orogenic belt
... Abstract. We present a new crustal cross section through the east-west trending ultrahigh-pressure (UHP) Dabie Shan orogenic belt, east central China, based on a 400km-long seismic refraction profile. Data from our profile reveal that the cratonal blocks north and south of the orogen are composed of ...
... Abstract. We present a new crustal cross section through the east-west trending ultrahigh-pressure (UHP) Dabie Shan orogenic belt, east central China, based on a 400km-long seismic refraction profile. Data from our profile reveal that the cratonal blocks north and south of the orogen are composed of ...
Three-dimensional density model of the upper mantle in
... observations (for spherical harmonics exceeding ~240). In the offshore regions satellite altimetry data are used for the high-frequency part of the field. Therefore, the satellite data provide horizontal resolution up to about 83 km, which is more than sufficient for this regional study (the maximal r ...
... observations (for spherical harmonics exceeding ~240). In the offshore regions satellite altimetry data are used for the high-frequency part of the field. Therefore, the satellite data provide horizontal resolution up to about 83 km, which is more than sufficient for this regional study (the maximal r ...
Seismogeodynamics of Lineament Structures in the Mountainous
... territories, in spite of numerous examples of such seismic events, remains still unsolved in many aspects. This problem is particularly important for densely populated southern European Russia, represented by the geodynamically relatively stable Scythian plate, where only weak and moderate local ear ...
... territories, in spite of numerous examples of such seismic events, remains still unsolved in many aspects. This problem is particularly important for densely populated southern European Russia, represented by the geodynamically relatively stable Scythian plate, where only weak and moderate local ear ...
PDF - University of Arizona
... The S-wave receiver function (SRF) method isolates the S-to-P (Sp) conversions from seismic discontinuities beneath a station. A converted Sp phase is generated when an incoming S phase crosses a velocity discontinuity beneath a seismic station and is converted to a P wave. The SRFs represent a res ...
... The S-wave receiver function (SRF) method isolates the S-to-P (Sp) conversions from seismic discontinuities beneath a station. A converted Sp phase is generated when an incoming S phase crosses a velocity discontinuity beneath a seismic station and is converted to a P wave. The SRFs represent a res ...
Seismic and Tectonic Correspondence of Major Earthquake
... The Romanche transform fault and its zone constitute the most prominent of these tectonic features. It is a typical long ridge-ridge transform offset with a longer fracture zone. The present-day transform offset is roughly 888 kilometres long and the adjoining fracture zone is 1890 kilometres (Figur ...
... The Romanche transform fault and its zone constitute the most prominent of these tectonic features. It is a typical long ridge-ridge transform offset with a longer fracture zone. The present-day transform offset is roughly 888 kilometres long and the adjoining fracture zone is 1890 kilometres (Figur ...
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... prototypes of the blocks, and their size are predetermined by the emerging Rayleigh‐Benard convection cells. In stu‐ dies of geology and geodynamics, the Rayleigh‐Benard convection cells were first referred to as a factor to explain the formation of initial continental cores. Considering the Raylei ...
... prototypes of the blocks, and their size are predetermined by the emerging Rayleigh‐Benard convection cells. In stu‐ dies of geology and geodynamics, the Rayleigh‐Benard convection cells were first referred to as a factor to explain the formation of initial continental cores. Considering the Raylei ...
Are the Earth and the Moon compositionally alike? Inferences on
... [5] However, as seismic velocity profiles only indirectly reflect such important variables as composition and thermal state, it is not possible to make inferences about the latter without making recourse to assumptions. Nonetheless, several interpretations of the seismic velocity profiles acquired i ...
... [5] However, as seismic velocity profiles only indirectly reflect such important variables as composition and thermal state, it is not possible to make inferences about the latter without making recourse to assumptions. Nonetheless, several interpretations of the seismic velocity profiles acquired i ...
Imaging crust and upper mantle beneath Mount Fuji, Japan, by
... event-station pair using the AK135 velocity model [Kennett et al., 1995] with epicentral distance and focal depth. After correcting for station elevation, the RFs are mapped along its raypath traced in three dimensions through a flat-layer velocity model. Time-to-depth conversion is achieved with the ...
... event-station pair using the AK135 velocity model [Kennett et al., 1995] with epicentral distance and focal depth. After correcting for station elevation, the RFs are mapped along its raypath traced in three dimensions through a flat-layer velocity model. Time-to-depth conversion is achieved with the ...
Mantle flow in regions of complex tectonics: Insights from Indonesia
... et al., 2007]. The exact timing of subduction initiation remains unknown; however, evidence suggests that it was not before 45 Ma [Hall, 2009]. Although this subduction zone appears to be continuous along Sumatra and Java, there is a sharp change in several characteristics at the Sunda strait, which ...
... et al., 2007]. The exact timing of subduction initiation remains unknown; however, evidence suggests that it was not before 45 Ma [Hall, 2009]. Although this subduction zone appears to be continuous along Sumatra and Java, there is a sharp change in several characteristics at the Sunda strait, which ...
The Mantle and its Products
... gross structure of the mantle, a large part of our knowledge of the mineralogy and chemical composition of the mantle is based on fragments that have been transported to the surface by deep-seated, highly explosive igneous melts. These fragments can take the form of so-called “mantle nodules,” or as ...
... gross structure of the mantle, a large part of our knowledge of the mineralogy and chemical composition of the mantle is based on fragments that have been transported to the surface by deep-seated, highly explosive igneous melts. These fragments can take the form of so-called “mantle nodules,” or as ...
Temporal evolution of continental lithospheric strength in actively
... It has been agreed for nearly a century that a strong, loadbearing outer layer of earth is required to support mountain ranges, transmit stresses to deform active regions, and store elastic strain to generate earthquakes. However, the depth and extent of this strong layer remain controversial. Here ...
... It has been agreed for nearly a century that a strong, loadbearing outer layer of earth is required to support mountain ranges, transmit stresses to deform active regions, and store elastic strain to generate earthquakes. However, the depth and extent of this strong layer remain controversial. Here ...
Magnetotellurics
Magnetotellurics (MT) is an electromagnetic geophysical method for inferring the earth's subsurface electrical conductivity from measurements of natural geomagnetic and geoelectric field variation at the Earth's surface. Investigation depth ranges from 300m below ground by recording higher frequencies down to 10,000m or deeper with long-period soundings. Developed in the USSR and France during the 1950s, MT is now an international academic discipline and is used in exploration surveys around the world. Commercial uses include hydrocarbon (oil and gas) exploration, geothermal exploration, mining exploration, as well as hydrocarbon and groundwater monitoring. Research applications include experimentation to further develop the MT technique, long-period deep crustal exploration, and earthquake precursor prediction research.