Strong-motion characteristics of January and February 2001 earthquakes in El Salvador

2004 ◽  
Author(s):  
J.M. Cepeda ◽  
M.B. Benito ◽  
E.A. Burgos
Keyword(s):  
El Salvador ◽  
Strong Motion ◽  
Motion Characteristics

Processed strong-motion data for the El Salvador earthquake of June 19, 1982

1988 ◽  
Author(s):  
Kenneth W. Campbell ◽  
Sylvester Theodore Algermissen
Keyword(s):  
El Salvador ◽  
Strong Motion ◽  
Strong Motion Data ◽  
Motion Data

Spectral matching RotD100 target spectra: Effect on records characteristics and seismic response

2021 ◽  
pp. 875529302110492
Author(s):  
Alan Rivera-Figueroa ◽  
Luis A Montejo
Keyword(s):  
Seismic Response ◽  
Strong Motion ◽  
Bridge Piers ◽  
Spectral Variability ◽  
Reinforced Concrete Bridge ◽  
Energy Demands ◽  
Target Spectrum ◽  
Single Column ◽  
Scaling Down ◽  
Motion Characteristics

This article investigates three different approaches to generate seismic input compatible with RotD100 design spectra: (1) separately matching each horizontal component to the target spectrum, (2) separately matching and then scaling-down the records to improve the match and (3) directly pursuing the match of RotD100 by simultaneously modifying both horizontal components. We examine the strong motion characteristics of the resulting records individually and their variability as suites of input records. The records generated, along with a set of amplitude-scaled records, are used as input for bi-directional non-linear response history analyses of idealized single column reinforced concrete bridge piers with different geometric and reinforcement characteristics. It is shown that the records generated pursuing a direct match of the target spectrum attain the closest match, retain better the strong motion characteristics of the seed records and their horizontal components exhibit a spectral variability comparable to suites of amplitude-scaled records. Regarding the effect on seismic response, the suites constructed separately matching each component consistently imposed larger peak inelastic and total energy demands than all other suites. Directly pursuing the match of RotD100 generated responses close but consistently below the expected from amplitude-scaled suites. The best results were obtained using the direct match methodology but using as target 110% the RotD100 spectrum as required in ASCE 7-16.

scholarly journals Crowdsourcing an Earthquake early warning system for the Indian Subcontinent

2019 ◽  
Author(s):  
Abdul Aleem ◽  
Paul George ◽  
Prasanna Natarajan
Keyword(s):  
Indian Subcontinent ◽  
Low Cost ◽  
Warning System ◽  
Strong Motion ◽  
Deep Penetration ◽  
Ground Shaking ◽  
Earthquake Early Warning System ◽  
Ongoing Work ◽  
Motion Characteristics ◽  
Main Components

Earthquakes are potentially very destructive natural events. The risk fromearthquakes is aggravated because they are unpredictable and can cause tremendousloss of life and property within seconds, particularly in dense urban settings. Wepresent our ongoing work to develop a comprehensive earthquake early warningsystem (EEWS) for the Indian subcontinent. The impetus for this work comes fromthe fact that India has just 82 seismic stations for a land area of about 3.2 million sq.km, with no dedicated EEWS, plus low-cost accelerometers are now easily available,and smartphones have deep penetration. The planned system will use a network ofmobile smartphones and stationary low-cost MEMS-based strong motion sensors.The main components of this project are: creating a high-density network of low-costsensors, real-time transmission of data, algorithms to analyze ground shaking data,compute ground motion characteristics, and determine if the source of shaking is anearthquake.

Spectrum-Compatible Earthquake Records and Their Influence on the Seismic Response of Reinforced Concrete Structures

2016 ◽  
Vol 32 (1) ◽  
pp. 101-123 ◽  
Author(s):  
Ramon L. Gascot ◽  
Luis A. Montejo
Keyword(s):  
Frequency Domain ◽  
Structural Response ◽  
Strong Motion ◽  
Continuous Wavelet ◽  
Earthquake Records ◽  
Inelastic Demand ◽  
Target Spectrum ◽  
Motion Characteristics ◽  
Frequency Domain Approach ◽  
Original Characteristic

Three different methodologies for the generation of spectrum-compatible records are evaluated: wavelet-based modification of seed records, seed record adjustment based on the continuous wavelet transform, and synthetic record generation in the frequency domain. It was found that the three methodologies are capable of generating compatible records with an acceptable level of match. However, the records generated using the frequency domain approach exhibit unrealistic strong motion characteristics and a tendency to induce less inelastic demand in the structures. In the case of methodologies based on modification of actual earthquake records, it was found that when the seed records are selected based on their initial compatibility with the target spectrum, the resultant compatible records not only better retain the original characteristic of the records but the variability in the structural response is reduced.

Building Typologies Prevalent in Northern Pakistan and Their Performance during the 2015 Hindu Kush Earthquake

2016 ◽  
Vol 32 (4) ◽  
pp. 2473-2493 ◽  
Author(s):  
Najif Ismail ◽  
Nouman Khattak
Keyword(s):  
Failure Modes ◽  
Strong Motion ◽  
Masonry Walls ◽  
Northern Pakistan ◽  
Ground Settlement ◽  
Hindu Kush ◽  
Reverse Faulting ◽  
Out Of Plane ◽  
Shear Cracking ◽  
Motion Characteristics

The M7.5 earthquake of 26 October 2015 resulted due to reverse faulting at an intermediate depth of 210 km within the northeast-trending tabular zone underneath the Hindu Kush region, with its epicenter located 45 km southwest of Jarm in Afghanistan. In Pakistan alone, the earthquake and subsequent aftershock swarm resulted in 280 fatalities, injuries to 1,770 persons, and notable damage to 109,123 buildings. A synopsis of observations is presented herein, covering details about seismotectonics, strong motion characteristics, damage statistics, and typical building failure modes. Building damage was observed to mostly concentrate in vulnerable rural and old unreinforced masonry buildings, with aspects such as complete or partial out of plane collapse of walls, collapse of roofs due to loss of seating, shear cracking in masonry walls/panels, shear and flexural damage in masonry spandrels, cracking at infill-frame interface, damage at building corners, pounding damage, toppled minarets, and damage due to ground settlement.

Influence of strong motion characteristics on permanent displacement of slopes

Landslides ◽  
2015 ◽  
Vol 13 (2) ◽  
pp. 279-292 ◽  
Author(s):  
Rana Roy ◽  
Debasis Ghosh ◽  
Gautam Bhattacharya
Keyword(s):  
Strong Motion ◽  
Permanent Displacement ◽  
Motion Characteristics

scholarly journals Reconnaissance Report on the 31 March 2002 Earthquake on the East Coast of Taiwan

2003 ◽  
Vol 19 (3) ◽  
pp. 531-556 ◽  
Author(s):  
C. H. Loh ◽  
K. C. Tsai ◽  
L. L. Chung ◽  
C. H. Yeh
Keyword(s):  
Earthquake Engineering ◽  
East Coast ◽  
Strong Motion ◽  
Building Damage ◽  
Lessons Learned ◽  
Typical Situation ◽  
Taipei Basin ◽  
Basin Effects ◽  
Motion Characteristics ◽  
Taiwan Earthquake

On 31 March 2002, an earthquake of magnitude ML=6.8 occurred in northeastern Taiwan that caused five deaths and damage to more than 300 buildings. The earthquake left some important lessons; these lessons were not considered after the 1999 Chi-Chi (Taiwan) earthquake but must be taken into account for the management of a similar situation in the future. This article first presents the strong motion characteristics found from the ground accelerations recorded from this event. In particular, the basin effects on the distribution of ground motion intensities observed in Taipei Basin are critically reviewed. Observations of some severe building damage following the earthquakes are then summarized. The building damage modes for this event, particularly due to the basin effect, are explored in detail. The characteristics of the building disaster reflected a typical situation that can occur in cities located in high seismic risk. Finally, the collapse of the two tower cranes on, and its impact on, the Taipei Financial Center construction site are described in detail. This article presents the main lessons learned from this earthquake in the light of work performed by the research team for natural disaster from the National Center for Research on Earthquake Engineering, Taiwan.

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