scholarly journals Irrecoverable collapse time for a fixed-hinge dry-stack arch under constant horizontal acceleration

2019 ◽  
Author(s):  
Gabriel Stockdale ◽  
Gabriele Milani ◽  
Vasilis Sarhosis
Keyword(s):  
Horizontal Acceleration ◽  
Collapse Time

Lesson learned from the pre-collapse time series of displacement of the Preonzo landslide (Switzerland)

2016 ◽  
Vol 41 ◽  
pp. 247-250 ◽  
Author(s):  
Serena Moretto ◽  
Francesca Bozzano ◽  
Carlo Esposito ◽  
Paolo Mazzanti
Keyword(s):  
Time Series ◽  
Collapse Time

Dynamic behavior of reinforced slopes: horizontal acceleration response

2010 ◽  
Vol 17 (4) ◽  
pp. 207-219 ◽  
Author(s):  
C.-C. Huang ◽  
J.-C. Horng ◽  
W.-J. Chang ◽  
S.-Y. Chueh ◽  
J.-S. Chiou ◽  
...  
Keyword(s):  
Dynamic Behavior ◽  
Acceleration Response ◽  
Horizontal Acceleration ◽  
Reinforced Slopes

On the characteristics of local geology and their influence on ground motions generated by the Loma Prieta earthquake in the San Francisco Bay region, California

1992 ◽  
Vol 82 (2) ◽  
pp. 603-641 ◽  
Author(s):  
Roger D. Borcherdt ◽  
Gary Glassmoyer
Keyword(s):  
Ground Motion ◽  
San Francisco ◽  
San Francisco Bay ◽  
Ground Motions ◽  
Loma Prieta Earthquake ◽  
Franciscan Complex ◽  
Horizontal Acceleration ◽  
Geological Conditions ◽  
Peak Horizontal Acceleration ◽  
Loma Prieta

Abstract Strong ground motions recorded at 34 sites in the San Francisco Bay region from the Loma Prieta earthquake show marked variations in characteristics dependent on crustal structure and local geological conditions. Peak horizontal acceleration and velocity inferred for sites underlain by “rock” generally occur on the transverse component of motion. They are consistently greater with lower attenuation rates than the corresponding mean value predicted by empirical curves based on previous strong-motion data. Theoretical amplitude distributions and synthetic seismograms calculated for 10-layer models suggest that “bedrock” motions were elevated due in part to the wide-angle reflection of S energy from the base of a relatively thin (25 km) continental crust in the region. Characteristics of geologic and geotechnical units as currently mapped for the San Francisco Bay region show that average ratios of peak horizontal acceleration, velocity and displacement increase with decreasing mean shear-wave velocity. Ratios of peak acceleration for sites on “soil” (alluvium, fill/Bay mud) are statistically larger than those for sites on “hard rock” (sandstone, shale, Franciscan Complex). Spectral ratios establish the existence of predominant site periods with peak amplifications near 15 for potentially damaging levels of ground motion at some sites underlain by alluvium and fill/bay mud. Average spectral amplifications inferred for vertical and the mean horizontal motion are, respectively, (1,1) for sites on the Franciscan Complex (KJf), (1.4, 1.5) for sites on Mesozoic and Tertiary rocks (TMzs), (2.1, 2.0) for sites on the Santa Clara Formation (QTs), (2.3, 2.9) for sites on alluvium (Qal), and (2.1, 4.0) for sites on fill/Bay mud (Qaf/Qhbm). These mean values are not statistically different at the 5% significance level from those inferred from previous low-strain data. Analyses suggest that soil amplification and reflected crustal shear energy were major contributors to levels of ground motion sufficient to cause damage to vulnerable structures at distances near 100 km in the cities of San Francisco and Oakland.

Peak horizontal acceleration and velocity from strong-motion records including records from the 1979 imperial valley, California, earthquake

1981 ◽  
Vol 71 (6) ◽  
pp. 2011-2038 ◽  
Author(s):  
William B. Joyner ◽  
David M. Boore
Keyword(s):  
Strong Motion ◽  
Fault Rupture ◽  
Imperial Valley ◽  
Attenuation Relations ◽  
Motion Data ◽  
Horizontal Acceleration ◽  
Anelastic Attenuation ◽  
Distance Dependence ◽  
Peak Horizontal Acceleration

Abstract We have taken advantage of the recent increase in strong-motion data at close distances to derive new attenuation relations for peak horizontal acceleration and velocity. This new analysis uses a magnitude-independent shape, based on geometrical spreading and anelastic attenuation, for the attenuation curve. An innovation in technique is introduced that decouples the determination of the distance dependence of the data from the magnitude dependence. The resulting equations are log A = − 1.02 + 0.249 M − log r − 0.00255 r + 0.26 P r = ( d 2 + 7.3 2 ) 1 / 2 5.0 ≦ M ≦ 7.7 log V = − 0.67 + 0.489 M − log r − 0.00256 r + 0.17 S + 0.22 P r = ( d 2 + 4.0 2 ) 1 / 2 5.3 ≦ M ≦ 7.4 where A is peak horizontal acceleration in g, V is peak horizontal velocity in cm/ sec, M is moment magnitude, d is the closest distance to the surface projection of the fault rupture in km, S takes on the value of zero at rock sites and one at soil sites, and P is zero for 50 percentile values and one for 84 percentile values. We considered a magnitude-dependent shape, but we find no basis for it in the data; we have adopted the magnitude-independent shape because it requires fewer parameters.

scholarly journals What can we learn from the January 2012 northern Italy earthquakes?

2012 ◽  
Vol 55 (1) ◽  
Author(s):  
Marco Massa ◽  
Gabriele Ameri ◽  
Sara Lovati ◽  
Rodolfo Puglia ◽  
Gianlorenzo Franceschina ◽  
...  
Keyword(s):  
Strong Motion ◽  
Northern Italy ◽  
Hazard Map ◽  
Civil Protection ◽  
Po Plain ◽  
Motion Data ◽  
Horizontal Acceleration ◽  
Magnitude Range ◽  
Seismic Hazard Map ◽  
Maximum Horizontal Acceleration

<p>This note focuses on the ground motion recorded during the recent moderate earthquakes that occurred in the central part of northern Italy (Panel 1), a region that is characterized by low seismicity. For this area, the Italian seismic hazard map [Stucchi et al. 2011] assigns a maximum horizontal acceleration (rock site) of up to 0.2 g (10% probability of being exceeded in 50 yr). In the last 4 yr, this region has been struck by 9 earthquakes in the magnitude range 4 <span>≤</span>M<span>w </span><span>≤</span> 5.0, with the three largest located in the Northern Apennines (the M<span>w </span>4.9 and 5.0 Parma events, in December 2008 and January 2012) and on the Po Plain (the M<span>w </span>4.9 Reggio Emila event, in January 2012). We have analyzed the strong-motion data (distance &lt;300 km) from these events as recorded by stations belonging to the Istituto Nazionale di Geofisica e Vulcanologia (RAIS, http://rais.mi.ingv.it; RSNC, http://iside.rm.ingv.it) and the Department of Civil Protection (RAN, www.protezionecivile.it; http://itaca.mi.ingv.it). […]</p>

scholarly journals Application of Urban Geology in Construction Projects (Case Study: Urban Geology of Sarpol-e Zahab, Kermanshah Province, Iran)

2021 ◽  
Vol 53 (1) ◽  
Author(s):  
Sajad Afzali ◽  
Faezeh Taheri Sarmad ◽  
Mojtaba Heidari ◽  
Seyed Hossein Jalali
Keyword(s):  
Urban Space ◽  
Construction Projects ◽  
Urban Geology ◽  
Natural Phenomena ◽  
Horizontal Acceleration ◽  
Preliminary Study ◽  
The Impact ◽  
The City ◽  
Financial Losses

Urban geology is a preliminary study for the construction and development of cities, which has been more prominent in recent decades in some countries despite its long application history. It assesses the impact of geological and natural phenomena on urban space and available structures. The earthquake on Nov. 21, 2017, inflicted a lot of damage to the city of Sarpol-e Zahab, west of Iran, including financial losses and casualties. Reconstruction of this city and planning for its sustainable development entail conducting urban geological studies. In the present study, the effect of natural phenomena on Sarpol-e Zahab County was studied by investigating its geology and geomorphology. The results showed that, in addition to the earthquake that habitually affected the city of Sarpol-e Zahab, the hazards of other phenomena are also significant. Recorded horizontal acceleration in the recent earthquake confirmed the high seismicity of Sarpol-e Zahab has.

scholarly journals An accurate estimation of the horizontal acceleration of a rower’s centre of mass using inertial sensors: a validation

2018 ◽  
Vol 18 (7) ◽  
pp. 940-946 ◽  
Author(s):  
Lotte L. Lintmeijer ◽  
Gert S. Faber ◽  
Hessel R. Kruk ◽  
A. J. “Knoek” van Soest ◽  
Mathijs J. Hofmijster
Keyword(s):  
Inertial Sensors ◽  
Accurate Estimation ◽  
Centre Of Mass ◽  
Horizontal Acceleration

scholarly journals Using the cavitation collapse time to indicate the extent of histotripsy-induced tissue fractionation

2018 ◽  
Vol 63 (5) ◽  
pp. 055013 ◽  
Author(s):  
J J Macoskey ◽  
S W Choi ◽  
T L Hall ◽  
E Vlaisavljevich ◽  
J E Lundt ◽  
...  
Keyword(s):  
Collapse Time ◽  
Tissue Fractionation

Visible geological effects of the CANNIKIN event

1972 ◽  
Vol 62 (6) ◽  
pp. 1519-1526 ◽  
Author(s):  
R. H. Morris ◽  
L. M. Gard ◽  
R. P. Snyder
Keyword(s):  
Vertical Displacement ◽  
Ground Zero ◽  
Subsidence Area ◽  
Collapse Time ◽  
Field Investigations ◽  
Principal Directions ◽  
Two Stages ◽  
Steep Slopes ◽  
Rock Slides ◽  
Lake Beds

abstract Postshot field investigations indicate that most of the visible geological effects produced by the CANNIKIN event are limited to an area of a 2-km radius from ground zero (GZ). Two stages of fracturing are recognized, one at shot time that induced a maximum of 0.6 m vertical displacement along the Teal Creek Fault located 1,070 m northwest of GZ, and one inferred to have occurred at collapse time (38 hr later). The three principal directions of fractures are east-northeast, northwest, and north and are related to pre-existing faults and lineaments. Major displacement along a fault located 760 m southeast of GZ is inferred to have occurred during collapse. Preliminary surveys indicate that the collapse sink is asymmetric with relation to GZ. The oval subsidence area is 1,270 by 915 m and the surface low, located 366 m southeast of GZ, subsided about 20 m. Several lakes are forming in the sink area. A portion of the intertidal platform along the Bering coast was uplifted about 1 m and major rock slides occurred along the cliffs within this zone of uplift. Elsewhere, minor rockfalls, slides and tundra slumps occurred along cliffs or steep slopes. Lake beds have been fractured and, in some cases, the lakes have drained.

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