Imag(in)ing the continental lithosphere
... limited to the small number of exposures of usually fragmented ophiolites and peridotite massifs. Outcrop scale (1–100 cm) features seen in the Beni–Bousera peridotite massif led Allegre and Turcotte (1986) to propose the “marble-cake” mantle model and Kellogg and Turcotte (1990) to develop a predic ...
... limited to the small number of exposures of usually fragmented ophiolites and peridotite massifs. Outcrop scale (1–100 cm) features seen in the Beni–Bousera peridotite massif led Allegre and Turcotte (1986) to propose the “marble-cake” mantle model and Kellogg and Turcotte (1990) to develop a predic ...
Earthquakes
... Click the Active Art button to open a browser window and access Active Art about seismic waves. ...
... Click the Active Art button to open a browser window and access Active Art about seismic waves. ...
Lithospheric expression of cenozoic subduction, mesozoic rifting
... 2.2. 3D initial velocity model Initial crustal velocity models including constraints on Moho depths are important for inverting for shear velocity from surface wave dispersion data and in estimating depth of mantle discontinuities using receiver function data. We first constructed a 3D P-wave velocit ...
... 2.2. 3D initial velocity model Initial crustal velocity models including constraints on Moho depths are important for inverting for shear velocity from surface wave dispersion data and in estimating depth of mantle discontinuities using receiver function data. We first constructed a 3D P-wave velocit ...
Europe from the bottom up: A statistical examination of the central
... present-day absolute plate motion (APM), whereas the asthenosphere is (hot) electrically conductive, seismically slow material with an anisotropy direction parallel to APM (e.g., Eaton et al., 2009). The techniques we use to image the Earth employ seismic and electromagnetic waves, and are thus prim ...
... present-day absolute plate motion (APM), whereas the asthenosphere is (hot) electrically conductive, seismically slow material with an anisotropy direction parallel to APM (e.g., Eaton et al., 2009). The techniques we use to image the Earth employ seismic and electromagnetic waves, and are thus prim ...
3-D structure of the Rio Grande Rift from 1
... RGR, important questions about the Rift evolution remain unresolved: 1) is it actively deforming along its southern extent (Berglund et al., 2012; Keller and Baldridge, 1999; Moucha et al., 2008)?; 2) does it propagate southward?; 3) what is the role of mantle convection in the formation of the Rift ...
... RGR, important questions about the Rift evolution remain unresolved: 1) is it actively deforming along its southern extent (Berglund et al., 2012; Keller and Baldridge, 1999; Moucha et al., 2008)?; 2) does it propagate southward?; 3) what is the role of mantle convection in the formation of the Rift ...
Dynamic Earth: crustal and mantle heterogeneity
... particular style of analysis and can include dependency on external factors such as the attenuation structure used to correct for frequency dependence. In the outer 400 km of the mantle, body-wave observations can be complemented by the exploitation of seismic surface waves that are well excited by ...
... particular style of analysis and can include dependency on external factors such as the attenuation structure used to correct for frequency dependence. In the outer 400 km of the mantle, body-wave observations can be complemented by the exploitation of seismic surface waves that are well excited by ...
Mantle Processes
... One way that mantle peridotites may melt is by plastic flow of large regions toward the surface (i.e., lower pressures). ...
... One way that mantle peridotites may melt is by plastic flow of large regions toward the surface (i.e., lower pressures). ...
Earthquakes - TeacherWeb
... a strike-slip fault, the rocks on either side of the middle. fault slip past each other sideways, with little up or The stress force called compression squeezes rock down motion. until it folds or breaks. A fold inthat rock that bends upward into is an Stress pushes a mass of rock in an twoarch oppo ...
... a strike-slip fault, the rocks on either side of the middle. fault slip past each other sideways, with little up or The stress force called compression squeezes rock down motion. until it folds or breaks. A fold inthat rock that bends upward into is an Stress pushes a mass of rock in an twoarch oppo ...
M - Unife
... Where M inside a domain is pointing to? Anisotropy The direction of the magnetization inside each domain is NOT arbitrary. For instance, the crystal structure is not isotropic so it is expected that along certain crystallographic directions it is easier to magnetize the crystal, along others it is ...
... Where M inside a domain is pointing to? Anisotropy The direction of the magnetization inside each domain is NOT arbitrary. For instance, the crystal structure is not isotropic so it is expected that along certain crystallographic directions it is easier to magnetize the crystal, along others it is ...
Earthquakes
... seismic station and epicenter given the difference in arrival times between s-waves and p-waves… 1. Look at the S-wave curve and P-wave curve to find where they are separated by the amount of time given. 2. Follow that line down/up to the distance in the appropriate units Ex: difference in p wave an ...
... seismic station and epicenter given the difference in arrival times between s-waves and p-waves… 1. Look at the S-wave curve and P-wave curve to find where they are separated by the amount of time given. 2. Follow that line down/up to the distance in the appropriate units Ex: difference in p wave an ...
0622932 COVER SHEET FOR PROPOSAL TO THE NATIONAL SCIENCE FOUNDATION NSF 02-011
... Harmon, N; Forsyth, D W; Scheirer, D; Holmes, C. Analysis of Gravity and Topography in the GLIMPSE Study Region: Isostatic Compensation and Uplift of the Sojourn and Hotu Matua Ridge Systems. Submitted to J. Geophys. Res. 2005. Forsyth, D W; Harmon, N; Scheirer, D; Duncan, R. The Distribution of Rec ...
... Harmon, N; Forsyth, D W; Scheirer, D; Holmes, C. Analysis of Gravity and Topography in the GLIMPSE Study Region: Isostatic Compensation and Uplift of the Sojourn and Hotu Matua Ridge Systems. Submitted to J. Geophys. Res. 2005. Forsyth, D W; Harmon, N; Scheirer, D; Duncan, R. The Distribution of Rec ...
univERsity oF copEnhAGEn
... where the lithospheric thickness is c. 100 km, shows a strong low velocity anomaly, with velocities smaller than 4.5 km/s. The transition from the cratonic to the Phanerozoic lithosphere in Northern Europe is marked by a pronounced decrease in seismic velocities at 150 km depth across the TESZ (Ziel ...
... where the lithospheric thickness is c. 100 km, shows a strong low velocity anomaly, with velocities smaller than 4.5 km/s. The transition from the cratonic to the Phanerozoic lithosphere in Northern Europe is marked by a pronounced decrease in seismic velocities at 150 km depth across the TESZ (Ziel ...
Isostasy and structure of the lower crust and upper mantle in the
... It should be stressed that the seismic data only indicate that velocity differences could occur in the upper mantle; the present data are too few to interpret the magnitude of the difference with any confidence. The second assumption made in calculating the pressures at 52 km depth was that one empi ...
... It should be stressed that the seismic data only indicate that velocity differences could occur in the upper mantle; the present data are too few to interpret the magnitude of the difference with any confidence. The second assumption made in calculating the pressures at 52 km depth was that one empi ...
(2016). A joint local and teleseismic tomography study of
... previous studies, we observe high Vp and Vs velocities in the crust below 20 km depth and a pronounced lowvelocity feature extending to ~250 km depth in the upper mantle. The NE-SW trending low-velocity feature is most evident at depths of 100–200 km where it is approximately 100 km wide and is simi ...
... previous studies, we observe high Vp and Vs velocities in the crust below 20 km depth and a pronounced lowvelocity feature extending to ~250 km depth in the upper mantle. The NE-SW trending low-velocity feature is most evident at depths of 100–200 km where it is approximately 100 km wide and is simi ...
Bulletin of the Seismological Society of America, Vol. 76, No. 2, pp
... was bulk processed, error control was not complete but hopefully the quantity of data has canceled this to some degree. Anisotropic parameters that are significant for P n ray paths have been ignored (Vetter and Minister, 1981; Hearn, 1984b). If rays to these stations came predominantly from a slow ...
... was bulk processed, error control was not complete but hopefully the quantity of data has canceled this to some degree. Anisotropic parameters that are significant for P n ray paths have been ignored (Vetter and Minister, 1981; Hearn, 1984b). If rays to these stations came predominantly from a slow ...
Chapter 9
... Seismic gap theory -- areas that have not experienced a big quake have been storing strain longer and are more likely to rupture. Probabilistic Hazard Analysis -- Try to determine the frequency of earthquakes along fault, and use this information to determine when the next earthquake is likely t ...
... Seismic gap theory -- areas that have not experienced a big quake have been storing strain longer and are more likely to rupture. Probabilistic Hazard Analysis -- Try to determine the frequency of earthquakes along fault, and use this information to determine when the next earthquake is likely t ...
Cape Verde hotspot from the upper crust to the top of the lower mantle
... regions of Iceland (Du et al., 2006). Piercing points for this set of PRFs are located mostly west of the islands (Fig. 4b). Apparently, west of the islands the structure of the transition zone is nearly normal. The stack of PRFs for all stations on the north-western islands (Fig. 3c) contains in th ...
... regions of Iceland (Du et al., 2006). Piercing points for this set of PRFs are located mostly west of the islands (Fig. 4b). Apparently, west of the islands the structure of the transition zone is nearly normal. The stack of PRFs for all stations on the north-western islands (Fig. 3c) contains in th ...
Author`s personal copy
... the common features of the crust and upper mantle structure throughout the whole investigated area, in particular, to trace the reference boundaries. The present paper continues the PNE data analysis and its key questions are the following: What are the general changes of the upper mantle velocity s ...
... the common features of the crust and upper mantle structure throughout the whole investigated area, in particular, to trace the reference boundaries. The present paper continues the PNE data analysis and its key questions are the following: What are the general changes of the upper mantle velocity s ...
A seismotectonic study for the Heraklion basin in Crete (Southern
... units. The upper layer, showing a velocity range between 1.5– 2.2 km/s, corresponds to the seawater layer and the upper series of the post-Alpine sediments. The second layer has a velocity between 2.3 and 4.4 km/s and could represent the lower post-Alpine sequences and part of the upper Alpine succe ...
... units. The upper layer, showing a velocity range between 1.5– 2.2 km/s, corresponds to the seawater layer and the upper series of the post-Alpine sediments. The second layer has a velocity between 2.3 and 4.4 km/s and could represent the lower post-Alpine sequences and part of the upper Alpine succe ...
Topic Standard nomenclature of seismic phases 1
... chaired by D. A. Storchak of the ISC. Members of the group were R. D. Adams, P. Bormann, R. E. Engdahl, J. Havskov, B. L. N. Kennett and J. Schweitzer. The working group has put together a modified standard nomenclature of seismic phases, which was meant to be concise, consistent and self-explanator ...
... chaired by D. A. Storchak of the ISC. Members of the group were R. D. Adams, P. Bormann, R. E. Engdahl, J. Havskov, B. L. N. Kennett and J. Schweitzer. The working group has put together a modified standard nomenclature of seismic phases, which was meant to be concise, consistent and self-explanator ...
A crustal model of the ultrahigh-pressure Dabie Shan orogenic belt
... Moho), which has a very simple waveform near the critical distance (⬃120 km), and (2) P x , which has a low (6.1 km/s) apparent velocity and is interpreted as a wide-angle reflection from the bottom of midcrustal low-velocity zone (see text for additional discussion). The phase refracted just below ...
... Moho), which has a very simple waveform near the critical distance (⬃120 km), and (2) P x , which has a low (6.1 km/s) apparent velocity and is interpreted as a wide-angle reflection from the bottom of midcrustal low-velocity zone (see text for additional discussion). The phase refracted just below ...
Crustal and uppermantle structure in the Eastern Mediterranean
... McClusky et al. (2000 and 2003) find that the rate of motion along the Hellenic trench reaches its maximum (~35 mm/yr) within the Gulf of Corinth and central Greece. Lateral motion along the NAF is ~24 mm/yr, with a slight compression along the eastern segment and extension in the Marmara Sea N ...
... McClusky et al. (2000 and 2003) find that the rate of motion along the Hellenic trench reaches its maximum (~35 mm/yr) within the Gulf of Corinth and central Greece. Lateral motion along the NAF is ~24 mm/yr, with a slight compression along the eastern segment and extension in the Marmara Sea N ...
The lithosphere and asthenosphere of the
... not find any Moho reflections from what could be interpreted as a shallow boundary of the crust and mantle (BCM), reflections were observed from a thin, higher-velocity layer (7.8 km s−1 ) at about 30 km depth. In a later analysis by Menke et al. (1996), these RRISP data were found to be consistent ...
... not find any Moho reflections from what could be interpreted as a shallow boundary of the crust and mantle (BCM), reflections were observed from a thin, higher-velocity layer (7.8 km s−1 ) at about 30 km depth. In a later analysis by Menke et al. (1996), these RRISP data were found to be consistent ...