P from the 2011 Tohoku-Oki earthquake Masatoshi Miyazawa
... (Peng and Chao, 2008), the Hikurangi subduction zone (Fry et al., 2011), and at depth within the San Andreas Fault zone (Ghosh et al., 2009). Ghosh et al. (2009) also report NVT triggered by teleseismic P-waves. The amplitudes of triggered NVT are larger than those of typical NVT observed in the reg ...
... (Peng and Chao, 2008), the Hikurangi subduction zone (Fry et al., 2011), and at depth within the San Andreas Fault zone (Ghosh et al., 2009). Ghosh et al. (2009) also report NVT triggered by teleseismic P-waves. The amplitudes of triggered NVT are larger than those of typical NVT observed in the reg ...
Two species of microcracks
... The second species of microcracks are the fluidsaturated stress-aligned microcracks pervading almost all in situ rocks, which worldwide observations of shear-wave splitting (SWS) demonstrate are ubiquitous in most rocks and rock types (Crampin et al., 1984; Crampin, 1994, 2006; Crampin and Peacock, ...
... The second species of microcracks are the fluidsaturated stress-aligned microcracks pervading almost all in situ rocks, which worldwide observations of shear-wave splitting (SWS) demonstrate are ubiquitous in most rocks and rock types (Crampin et al., 1984; Crampin, 1994, 2006; Crampin and Peacock, ...
Earthquake Energy Release Mechanism
... http://www.nasa.gov/audience/forstudents/5-8/features/F_Earth_Has_Faults.html ...
... http://www.nasa.gov/audience/forstudents/5-8/features/F_Earth_Has_Faults.html ...
Seismotectonics of Badra-Amarah Fault, Iraq
... One of the global institutions that are tasked to determine focal mechanism solutions for the medium to large magnitude earthquakes (mb ≥ 4.0) is the Harvard University (USA) group that estimates the Global Centroid Moment Tensor (GCMT) solutions (Dziewonski et al., 1981 and Ekström et al., 2012). T ...
... One of the global institutions that are tasked to determine focal mechanism solutions for the medium to large magnitude earthquakes (mb ≥ 4.0) is the Harvard University (USA) group that estimates the Global Centroid Moment Tensor (GCMT) solutions (Dziewonski et al., 1981 and Ekström et al., 2012). T ...
Seismically Driven Characterization and
... Continuous Fracture Modeling (CFM) workflow allows the user to evaluate and select their fracture drivers from various reservoir property models – essentially deriving the mechanical units prone to fracturing from these data. We do not presume to know the cause of fracturing nor do we claim to direc ...
... Continuous Fracture Modeling (CFM) workflow allows the user to evaluate and select their fracture drivers from various reservoir property models – essentially deriving the mechanical units prone to fracturing from these data. We do not presume to know the cause of fracturing nor do we claim to direc ...
August 2007
... room, and media room. The building includes DEM, Nevada Department of Homeland Security, Highway Patrol Dispatch, Nevada Division of Forestry, National Guard, and the State’s financial system back up. Otto Tune showed the Council the back-up power generators (with capacities of handling the electric ...
... room, and media room. The building includes DEM, Nevada Department of Homeland Security, Highway Patrol Dispatch, Nevada Division of Forestry, National Guard, and the State’s financial system back up. Otto Tune showed the Council the back-up power generators (with capacities of handling the electric ...
Larry J. Ruff - Seismological Research Letters
... page that was at 33 k m - - i s this a major discovery?" To help teachers respond to questions such as these, this EduQuakes column is focused on earthquake depth, and the EduPhase section treats _pP. Although not a comprehensive survey of hypocentral depth, at least it provides a starting point for ...
... page that was at 33 k m - - i s this a major discovery?" To help teachers respond to questions such as these, this EduQuakes column is focused on earthquake depth, and the EduPhase section treats _pP. Although not a comprehensive survey of hypocentral depth, at least it provides a starting point for ...
The depth effect of earthquakes on tsunami
... in the Sea of Okhotsk. Such earthquakes induced tsunamis in the past. For assessment of tsunami hazard it is necessary to analyze all possible tsunami source locations, and this will be done in the future. Here we will consider only one earthquake of 2013 for study of the depth effect. Taking into a ...
... in the Sea of Okhotsk. Such earthquakes induced tsunamis in the past. For assessment of tsunami hazard it is necessary to analyze all possible tsunami source locations, and this will be done in the future. Here we will consider only one earthquake of 2013 for study of the depth effect. Taking into a ...
DENSITY-VELOCITY RELATIONSHIP IN THE UPPER
... crust that is accompanied by a negative gravity anomaly can be attributed to anorthosites. Due to a high amount of plagioclase and CaO, these rocks have high P-wave velocity comparable with that of gabbroid rocks, while their density is significantly less (Henkel et al., 1990; Kern et al., 1993). Ho ...
... crust that is accompanied by a negative gravity anomaly can be attributed to anorthosites. Due to a high amount of plagioclase and CaO, these rocks have high P-wave velocity comparable with that of gabbroid rocks, while their density is significantly less (Henkel et al., 1990; Kern et al., 1993). Ho ...
How might infinitesimal strain analysis be used as a
... this plate motion and strain. Search HAZUS-MH: Earthquake Event Report for Provo Segment Mw 7.2 ShakeMap Scenario for answers to the following questions: What is the expected economic loss from the earthquake? (search for “economic loss”) ...
... this plate motion and strain. Search HAZUS-MH: Earthquake Event Report for Provo Segment Mw 7.2 ShakeMap Scenario for answers to the following questions: What is the expected economic loss from the earthquake? (search for “economic loss”) ...
Cable Noise Analysis and Suppression in DAS
... quality of DAS-VSP data, the cable noise has to be suppressed. Firstly, the noise is analyzed, and then a suppression method is presented based on the result of the analysis. Finally, the method is tested by a Walkaway-VSP data in Bohai Bay Basin. In a single shot record of DAS-VSP data, we can reco ...
... quality of DAS-VSP data, the cable noise has to be suppressed. Firstly, the noise is analyzed, and then a suppression method is presented based on the result of the analysis. Finally, the method is tested by a Walkaway-VSP data in Bohai Bay Basin. In a single shot record of DAS-VSP data, we can reco ...
Subionospheric VLF perturbations observed at low latitude
... stated that it was reasonable for them to have detected no terminator time anomaly on their long propagation path because the perturbed region was too small relative to the whole propagation path. Maekawa and Hayakawa (2006) also stated that N–S propagation itself was not so suitable generally to de ...
... stated that it was reasonable for them to have detected no terminator time anomaly on their long propagation path because the perturbed region was too small relative to the whole propagation path. Maekawa and Hayakawa (2006) also stated that N–S propagation itself was not so suitable generally to de ...
How might infinitesimal strain analysis be used as a component of
... this plate motion and strain. Read (skim) Cascadia Subduction Zone Earthquakes: A Magnitude 9.0 Earthquake Scenario, pg. 6, 8-17 and answer the following questions: What is the expected economic loss from the earthquake? ...
... this plate motion and strain. Read (skim) Cascadia Subduction Zone Earthquakes: A Magnitude 9.0 Earthquake Scenario, pg. 6, 8-17 and answer the following questions: What is the expected economic loss from the earthquake? ...
Australian Journal of Earth Sciences Structure of the Tasmanian
... 2001), which involved the deployment of 44 digital and analogue recorders throughout Tasmania to record refraction and reflection phases from the *36 000 airgun shots produced by the RV Rig Seismic during its circumnavigation of Tasmania in 1995. The aim of the current study is to simultaneously inv ...
... 2001), which involved the deployment of 44 digital and analogue recorders throughout Tasmania to record refraction and reflection phases from the *36 000 airgun shots produced by the RV Rig Seismic during its circumnavigation of Tasmania in 1995. The aim of the current study is to simultaneously inv ...
A Comparison Between the Shear Strength Measured with
... tests conducted on eight specimens of Boulder Clay using the direct shear and triaxial devices. Casagrande and Poulos (1964) presented the results of CD direct shear and CD triaxial tests performed on compacted specimens of a lean clay which showed that about the same shear strength envelope was obt ...
... tests conducted on eight specimens of Boulder Clay using the direct shear and triaxial devices. Casagrande and Poulos (1964) presented the results of CD direct shear and CD triaxial tests performed on compacted specimens of a lean clay which showed that about the same shear strength envelope was obt ...
ÔØ Å ÒÙ× Ö ÔØ - uO Research
... (1999). We selected the P-T paths calculated for the case where the mechanical decoupling between the slab and the overriding plate occurs where slab temperature reaches 550°C (see also Wada et al., 2008). These curves were obtained for subduction zone segments that may not reflect local conditions ...
... (1999). We selected the P-T paths calculated for the case where the mechanical decoupling between the slab and the overriding plate occurs where slab temperature reaches 550°C (see also Wada et al., 2008). These curves were obtained for subduction zone segments that may not reflect local conditions ...
Theoretical mineralogy, density, seismic wave speeds, and H2O
... 1993], rendering it among the youngest, most slowly subducting, and, consequently, warmest slabs in the world. The slab has a thick sediment blanket and upper plate volcanism is weak to moderate. Seismicity: the correlation to dehydration In the vicinity of southern Vancouver Island, seismicity alon ...
... 1993], rendering it among the youngest, most slowly subducting, and, consequently, warmest slabs in the world. The slab has a thick sediment blanket and upper plate volcanism is weak to moderate. Seismicity: the correlation to dehydration In the vicinity of southern Vancouver Island, seismicity alon ...
Seismic retrofit
Seismic retrofitting is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquakes. With better understanding of seismic demand on structures and with our recent experiences with large earthquakes near urban centers, the need of seismic retrofitting is well acknowledged. Prior to the introduction of modern seismic codes in the late 1960s for developed countries (US, Japan etc.) and late 1970s for many other parts of the world (Turkey, China etc.), many structures were designed without adequate detailing and reinforcement for seismic protection. In view of the imminent problem, various research work has been carried out. State-of-the-art technical guidelines for seismic assessment, retrofit and rehabilitation have been published around the world - such as the ASCE-SEI 41 and the New Zealand Society for Earthquake Engineering (NZSEE)'s guidelines. These codes must be regularly updated; the 1994 Northridge earthquake brought to light the brittleness of welded steel frames, for example.The retrofit techniques outlined here are also applicable for other natural hazards such as tropical cyclones, tornadoes, and severe winds from thunderstorms. Whilst current practice of seismic retrofitting is predominantly concerned with structural improvements to reduce the seismic hazard of using the structures, it is similarly essential to reduce the hazards and losses from non-structural elements. It is also important to keep in mind that there is no such thing as an earthquake-proof structure, although seismic performance can be greatly enhanced through proper initial design or subsequent modifications.