Seismicity in the Antarctic Continent and Surrounding Ocean
... the Syowa Station. Epicenters of ten local earthquakes were determined during these three years. Many different types of earthquakes, such as a main-shock-aftershock, twin earthquake, earthquake swarms, were detected and identified at that time. The seismic activity during this period was higher tha ...
... the Syowa Station. Epicenters of ten local earthquakes were determined during these three years. Many different types of earthquakes, such as a main-shock-aftershock, twin earthquake, earthquake swarms, were detected and identified at that time. The seismic activity during this period was higher tha ...
3D GROUND MOTION IN THE GEORGIA BASIN REGION OF SW
... s simulations of deep in-slab earthquakes. Fig. 3 shows that the largest simulated ground motions always occur NW of the source location due to the Nisqually source character (Fig. 2), causing a significant difference in the amplitude and pattern of the resulting ground motion with source location. ...
... s simulations of deep in-slab earthquakes. Fig. 3 shows that the largest simulated ground motions always occur NW of the source location due to the Nisqually source character (Fig. 2), causing a significant difference in the amplitude and pattern of the resulting ground motion with source location. ...
Time-dependent analysis of aftershock events and structural impacts
... of these events, their source parameters and focal mechanisms (M ≤5.0) are extensively detailed and documented [4]. The past strong events (M≤5.0) in the instrumental period are reported to be a sequence that started in June 1900 and lasted several months [4, 21–23]. These events are reported as to ...
... of these events, their source parameters and focal mechanisms (M ≤5.0) are extensively detailed and documented [4]. The past strong events (M≤5.0) in the instrumental period are reported to be a sequence that started in June 1900 and lasted several months [4, 21–23]. These events are reported as to ...
Earthquakes - modelling and monitoring
... Earthquakes are among the most deadly natural hazards. There are around 100 earthquakes each year of a size that could cause serious damage. They strike without warning and many of the Earth’s earthquake zones coincide with areas of high population density. When large earthquakes occur in such areas ...
... Earthquakes are among the most deadly natural hazards. There are around 100 earthquakes each year of a size that could cause serious damage. They strike without warning and many of the Earth’s earthquake zones coincide with areas of high population density. When large earthquakes occur in such areas ...
Chapter 01 - Earthquakes
... without causing a discrete surface rupture (Figure 2D). Some faults may not have sufficient slip to influence the topography at the Earth’s surface at all. Faults that do not rupture the surface are referred to as blind faults (Figure 2D). For every large fault we can map on the surface, there are l ...
... without causing a discrete surface rupture (Figure 2D). Some faults may not have sufficient slip to influence the topography at the Earth’s surface at all. Faults that do not rupture the surface are referred to as blind faults (Figure 2D). For every large fault we can map on the surface, there are l ...
SEISMIC STRUCTURAL PERFORMANCE INDEX EVALUATION OF
... KEYWORDS: Seismic Capacity, RC Building, Earthquake, Metro Manila 1. INTRODUCTION The problem of possible hazards brought about by earthquakes such as building collapse and loss of lives, especially in major urban metropolis like Metro Manila, must be addressed by city planners, building officials a ...
... KEYWORDS: Seismic Capacity, RC Building, Earthquake, Metro Manila 1. INTRODUCTION The problem of possible hazards brought about by earthquakes such as building collapse and loss of lives, especially in major urban metropolis like Metro Manila, must be addressed by city planners, building officials a ...
Earthquakes - Bakersfield College
... Roman numeral I indicates the least intensity while Roman numeral XII is used to show the highest intensity. How reliable or scientific is the Mercalli scale? Some observers of the earthquake may exaggerate the intensity, or in some cases, two witnesses may not agree with what happened to the same a ...
... Roman numeral I indicates the least intensity while Roman numeral XII is used to show the highest intensity. How reliable or scientific is the Mercalli scale? Some observers of the earthquake may exaggerate the intensity, or in some cases, two witnesses may not agree with what happened to the same a ...
P-wave compression propagating wave
... Roman numeral I indicates the least intensity while Roman numeral XII is used to show the highest intensity. How reliable or scientific is the Mercalli scale? Some observers of the earthquake may exaggerate the intensity, or in some cases, two witnesses may not agree with what happened to the same a ...
... Roman numeral I indicates the least intensity while Roman numeral XII is used to show the highest intensity. How reliable or scientific is the Mercalli scale? Some observers of the earthquake may exaggerate the intensity, or in some cases, two witnesses may not agree with what happened to the same a ...
THE ROTATIONAL AND GRAVITATIONAL SIGNATURE OF THE
... The figure axis of the Earth is the principal axis of the greatest moment of inertia of the Earth. If the Earth were completely solid and rigid, then the polar motion excitation functions x(t) and y(t) would specify the location of the figure axis within the terrestrial reference frame. But becaus ...
... The figure axis of the Earth is the principal axis of the greatest moment of inertia of the Earth. If the Earth were completely solid and rigid, then the polar motion excitation functions x(t) and y(t) would specify the location of the figure axis within the terrestrial reference frame. But becaus ...
Subionospheric VLF perturbations observed at low latitude
... The results of the VLF data analysis using three methods; TT, average nighttime and daytime amplitude variations, and nighttime fluctuations, are presented here for the 18 December 2006 earthquake. 4.1. Terminator-time (TT) method As shown in Fig. 1, the VTX-Suva propagation path is largely in the E– ...
... The results of the VLF data analysis using three methods; TT, average nighttime and daytime amplitude variations, and nighttime fluctuations, are presented here for the 18 December 2006 earthquake. 4.1. Terminator-time (TT) method As shown in Fig. 1, the VTX-Suva propagation path is largely in the E– ...
A study of local amplification effect of soil layers on ground motion in
... in irregular layers of deposition ranging in age from the late Pliocene era to the present (Dongol, 1985; Fujii and Sakai, 2002; Moribayashi and Maruo, 1980; Sakai et al., 2001; Yoshida and Igarashi, 1984; and Dahal and Aryal, 2002). Based on a gravity measurement study, Moribayashi and Maruo (1980) ...
... in irregular layers of deposition ranging in age from the late Pliocene era to the present (Dongol, 1985; Fujii and Sakai, 2002; Moribayashi and Maruo, 1980; Sakai et al., 2001; Yoshida and Igarashi, 1984; and Dahal and Aryal, 2002). Based on a gravity measurement study, Moribayashi and Maruo (1980) ...
On the onset of ionospheric precursors 40 min before strong
... coseismic ionospheric disturbance (CID). On the contrary, Mw < 8 earthquakes show CIDs but no evident precursory signal. CIDs are caused by the arrival of atmospheric waves excited by the vertical motion of the ground (or sea level) and usually appear within a few minutes after the earthquake [Calai ...
... coseismic ionospheric disturbance (CID). On the contrary, Mw < 8 earthquakes show CIDs but no evident precursory signal. CIDs are caused by the arrival of atmospheric waves excited by the vertical motion of the ground (or sea level) and usually appear within a few minutes after the earthquake [Calai ...
Improvement of Methods for Earthquake
... evaluation of individual slopes aimed to different demands (ISSMGE, 1999; Australian geomechanics society landslide zoning working group, 2007; Bommer et al, 2002;). Generally, according to the applicability of landslides hazard zoning map, these approaches have been classified into three grades at ...
... evaluation of individual slopes aimed to different demands (ISSMGE, 1999; Australian geomechanics society landslide zoning working group, 2007; Bommer et al, 2002;). Generally, according to the applicability of landslides hazard zoning map, these approaches have been classified into three grades at ...
Full Text pdf - Centre for Samoan Studies
... The Samoa China Digital Seismic Network (SCDSN) completed its final installations in June 2012. The SCDSN consists of 3 broadband seismic stations, 4 portable short period seismic stations, one Data center and related data transmission equipments. This will significantly enhance local monitoring cap ...
... The Samoa China Digital Seismic Network (SCDSN) completed its final installations in June 2012. The SCDSN consists of 3 broadband seismic stations, 4 portable short period seismic stations, one Data center and related data transmission equipments. This will significantly enhance local monitoring cap ...
Handbook for Seismic Rehabilitation of Existing Buildings
... Prior to the emphasis on performance based design, perceived qualitative differences between the probable performance of difference schemes would be used to assist in choosing a scheme. Specific performance objectives are often set prior to the development of schemes. Objectives that require a limit ...
... Prior to the emphasis on performance based design, perceived qualitative differences between the probable performance of difference schemes would be used to assist in choosing a scheme. Specific performance objectives are often set prior to the development of schemes. Objectives that require a limit ...
Global pattern of earthquakes and seismic energy distributions
... The earthquake catalogues of 20th century can be considered statistically complete for events with M ≥ 7.0 (Kossobokov, 2004; Pacheco and Sykes, 1992). Then, our study is based on the global catalogue of all M ≥ 7.0 events recorded in 1900–2009, as a selection from the catalogue compiled by Shebalin ...
... The earthquake catalogues of 20th century can be considered statistically complete for events with M ≥ 7.0 (Kossobokov, 2004; Pacheco and Sykes, 1992). Then, our study is based on the global catalogue of all M ≥ 7.0 events recorded in 1900–2009, as a selection from the catalogue compiled by Shebalin ...
UPDATED SEISMIC HAZARD FOR LEBANON AND IMPLICATIONS
... The following relevant observations and assumptions were considered for modeling the seismic sources and deriving their earthquake recurrence relationships: (i) The seismic events triggered by the fault system in the Lebanese segment under evaluation are enclosed within the area zone defined in Figu ...
... The following relevant observations and assumptions were considered for modeling the seismic sources and deriving their earthquake recurrence relationships: (i) The seismic events triggered by the fault system in the Lebanese segment under evaluation are enclosed within the area zone defined in Figu ...
Seismic hazard for some regions of the world examined using strain
... as the M3. In this cell the energy has been accumulating since 1991 and the quantity DT is equal to 14.6 years. In view of the above results, we can conclude that in the next decade the area will experience an earthquake with magnitude of equivalent energy of 1023 ergs (less or equal to 8.4) and the ...
... as the M3. In this cell the energy has been accumulating since 1991 and the quantity DT is equal to 14.6 years. In view of the above results, we can conclude that in the next decade the area will experience an earthquake with magnitude of equivalent energy of 1023 ergs (less or equal to 8.4) and the ...
The mechanism of intraplate earthquakes: insights from geodynamic
... fault weakening, several possible causes have been proposed. Sibson [1992] suggested fault weakening through change of water pore pressure on faults. Lyakhovsky et al. [2001] suggested changes of fault rheology due to a balance between weakening due to earthquakes and interseismic healing. Fault wea ...
... fault weakening, several possible causes have been proposed. Sibson [1992] suggested fault weakening through change of water pore pressure on faults. Lyakhovsky et al. [2001] suggested changes of fault rheology due to a balance between weakening due to earthquakes and interseismic healing. Fault wea ...
PDF only
... EQs we studied. This has been inferred in case of Figure 13, as a special variation of the value p/b over the period from 5/8/2005 until 15/8/2005. Here we examined the possible influence of the electron precipitation during this period in broad regions over the globe. Figure 15b (bottom panel) show ...
... EQs we studied. This has been inferred in case of Figure 13, as a special variation of the value p/b over the period from 5/8/2005 until 15/8/2005. Here we examined the possible influence of the electron precipitation during this period in broad regions over the globe. Figure 15b (bottom panel) show ...
Existence of low-velocity zones under the source areas of the... 2007 Chuetsu-oki earthquakes inferred from travel-time tomography
... (Received November 22, 2007; Revised February 13, 2008; Accepted February 26, 2008; Online published November 18, 2008) ...
... (Received November 22, 2007; Revised February 13, 2008; Accepted February 26, 2008; Online published November 18, 2008) ...
Ground-shaking mapping for a scenario earthquake considering
... In order to examine the correlation of the shear-wave velocity with the geomorphological conditions in the Kanto and Hanshin areas, soil data on shear-wave velocity for these two areas are collected. The total number of soil data compiled was 478 (the number of PS logging and that of boring data is ...
... In order to examine the correlation of the shear-wave velocity with the geomorphological conditions in the Kanto and Hanshin areas, soil data on shear-wave velocity for these two areas are collected. The total number of soil data compiled was 478 (the number of PS logging and that of boring data is ...
The San Andreas Fault
... Different segments of the fault also behave differently. For example, in the vicinity of Hollister, frequent small shocks are recorded, and slow movement .at the rate of 12 mm per year has been recorded. In contrast, the segment near San Francisco, except for an earthquake of magnitude 5.3 in 1957, ...
... Different segments of the fault also behave differently. For example, in the vicinity of Hollister, frequent small shocks are recorded, and slow movement .at the rate of 12 mm per year has been recorded. In contrast, the segment near San Francisco, except for an earthquake of magnitude 5.3 in 1957, ...
Variations of fluid pressure within the subducting oceanic crust and
... stations deployed during a seismic survey conducted in 2001 with three explosions (red stars) [Kodaira et al., 2004]. Solid squares denote permanent stations. (c) Relocated regular earthquakes as circles scaled to earthquake magnitude and color coded to depth. Open stars represent epicenters of LFEs ...
... stations deployed during a seismic survey conducted in 2001 with three explosions (red stars) [Kodaira et al., 2004]. Solid squares denote permanent stations. (c) Relocated regular earthquakes as circles scaled to earthquake magnitude and color coded to depth. Open stars represent epicenters of LFEs ...
1570 Ferrara earthquake
The 1570 Ferrara earthquake struck the Italian city of Ferrara on November 16 and 17, 1570. After the initial shocks, an earthquake swarm continued for four years, with over 2000 aftershocks concentrated from November 1570 to February 1571.The same area was struck, centuries later, by another major earthquake of comparable intensity.The disaster destroyed half the city, permanently marked many of the buildings left standing, and directly contributed to – but was not the sole cause of – a long-term decline of the city lasting until the 19th century.The earthquake caused the first documented episode of soil liquefaction in the Po Valley, and one of the oldest occurrences of the event known outside of paleoseismology. It led to the establishment of an earthquake observatory which published to very high regard, and the drafting of some of the first-known building designs based on a scientific seismic-resistant approach.