scholarly journals STRONG-MOTION PREDICTION BY SEMI-EMPIRICAL METHOD BASED ON VARIABLE-SLIP RUPTURE MODEL OF EARTHQUAKE FAULT

1998 ◽  
Vol 63 (509) ◽  
pp. 49-60 ◽  
Author(s):  
Kazuo DAN ◽  
Toshiaki SATO
Keyword(s):  
Strong Motion ◽  
Empirical Method ◽  
Motion Prediction ◽  
Earthquake Fault ◽  
Rupture Model ◽  
Semi Empirical

scholarly journals Seismic Hazard of the Uttarakhand Himalaya, India, from Deterministic Modeling of Possible Rupture Planes in the Area

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Anand Joshi ◽  
Ashvini Kumar ◽  
Heriberta Castanos ◽  
Cinna Lomnitz
Keyword(s):  
Seismic Hazard ◽  
Peak Ground Acceleration ◽  
Strong Motion ◽  
Semiempirical Method ◽  
Empirical Method ◽  
Attenuation Relation ◽  
Ground Acceleration ◽  
Important Region ◽  
Semi Empirical ◽  
Uttarakhand Himalaya

This paper presents use of semiempirical method for seismic hazard zonation. The seismotectonically important region of Uttarakhand Himalaya has been considered in this work. Ruptures along the lineaments in the area identified from tectonic map are modeled deterministically using semi empirical approach given by Midorikawa (1993). This approach makes use of attenuation relation of peak ground acceleration for simulating strong ground motion at any site. Strong motion data collected over a span of three years in this region have been used to develop attenuation relation of peak ground acceleration of limited magnitude and distance applicability. The developed attenuation relation is used in the semi empirical method to predict peak ground acceleration from the modeled rupture planes in the area. A set of values of peak ground acceleration from possible ruptures in the area at the point of investigation is further used to compute probability of exceedance of peak ground acceleration of values 100 and 200 gals. The prepared map shows that regions like Tehri, Chamoli, Almora, Srinagar, Devprayag, Bageshwar, and Pauri fall in a zone of 10% probability of exceedence of peak ground acceleration of value 200 gals.

A semi-empirical method for simulating strong ground motions based on variable-slip rupture models for large earthquakes

1999 ◽  
Vol 89 (1) ◽  
pp. 36-53
Author(s):  
Kazuo Dan ◽  
Toshiaki Sato
Keyword(s):  
Slip Velocity ◽  
Ground Motions ◽  
Seismic Intensity ◽  
Empirical Method ◽  
Source Inversion ◽  
Tokyo Metropolitan Area ◽  
Rupture Model ◽  
Semi Empirical ◽  
Large Earthquakes ◽  
Strong Ground

Abstract Variable-slip rupture models for large earthquakes, obtained by the source inversion of long-period (>4 sec) seismic waves, are taken into account in a semi-empirical method for simulating broadband (< about 10 sec) strong ground motions. The high-frequency (>0.25 Hz) source spectrum of the (p, q)th subfault is inferred by the θ−2 mode with two circular corner frequencies. The first is ωDpq = Vpq/Dpq, due to the temporal integration of the slip-velocity time function, where Vpq is the maximum slip velocity and Dpq is the final slip. The other is ωSpq = 2βpq/λpq, due to the spacial integration of the slip-velocity time function on the subfault, where βpq is the S-wave velocity of the medium and λpq is the equivalent radius of the subfault. Here, Vpq, Dpq, βpq, and λpq are specified by the long-period source-inversion results. First, we describe this new method by applying it to the variable-slip rupture model for the 1985 Michoacan, Mexico, earthquake of MS 8.1 obtained by Mendoza and Hartzell (1989). The simulated accelerations and velocities at CAL (Caleta de Campos) and VIL (La Villita), both located above the ruptured zone, are in good agreement with the observed ones. Next, the method is applied to the variable-slip rupture model for the 1923 Kanto, Japan, earthquake of MS 8.2 obtained by Wald and Somerville (1995). This earthquake is one of the most important earthquakes for the mitigation of earthquake disaster in the Tokyo metropolitan area; unfortunately, strong-motion records for this earthquake were off-scaled in the region of strong shaking and significant damage. The pseudo-velocity response spectrum of the simulated acceleration of TOK (Tokyo JMA) averages 60 cm/sec in the period range of 0.5 to 10 sec and is consistent with that of the Kanto earthquake record observed at HNG (Hongo, Tokyo), whose off-scaled parts were restored as well as possible by Yokota et al. (1989). The instrumental JMA seismic intensities (JMA, 1996) of the simulated accelerations at TOK and YOK (Yokohama JMA) are consistent with the observed JMA seismic intensity 6 (JMA, 1983). The instrumental JMA seismic intensity of the simulated accelerations at KNS (soil site in Odawara) is also consistent with the JMA seismic intensity 7, estimated from the ratio of collapsed houses (Mononobe, 1925). The simulated broadband (0.1 to 10 sec) motions will be useful in the mitigation of earthquake disaster in the Tokyo metropolitan area.

Modeling the Effects of O-sulfonation on the CID of Serine

2020 ◽  
Author(s):  
Kenneth Lucas ◽  
George Barnes
Keyword(s):  
Sulfo Group ◽  
High Energy ◽  
Empirical Method ◽  
Side Chain ◽  
Energy Structure ◽  
Direct Dynamics ◽  
Theoretical Mass ◽  
Intermolecular Proton Transfer ◽  
Dynamics Simulations ◽  
Semi Empirical

We present the results of direct dynamics simulations and DFT calculations aimed at elucidating the effect of \textit{O}-sulfonation on the collision induced dissociation for serine. Towards this end, direct dynamics simulations of both serine and sulfoserine were performed at multiple collision energies and theoretical mass spectra obtained. Comparisons to experimental results are favorable for both systems. Peaks related to the sulfo group are identified and the reaction dynamics explored. In particular, three significant peaks (m\z 106, 88, and 81) seen in the theoretical mass spectrum directly related to the sulfo group are analyzed as well as major peaks shared by both systems. Our analysis shows that the m\z 106 peaks result from intramolecular rearrangements, intermolecular proton transfer among complexes composed of initial fragmentation products, and at high energy side-chain fragmentation. The \mz 88 peak was found to contain multiple constitutional isomers, including a previously unconsidered, low energy structure. It was also seen that the RM1 semi empirical method was not able to obtain all of the major peaks seen in experiment for sulfoserine. In contrast, PM6 did obtain all major experimental peaks.

Theoretical investigation of Ramachandran plot of N-formyl-L-alanine-amide

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Genetic Algorithm ◽  
Theoretical Investigation ◽  
Energy Analysis ◽  
Empirical Method ◽  
Conformational Space ◽  
Ramachandran Plot ◽  
Global Minima ◽  
Reasonable Time ◽  
Semi Empirical

The full conformational space of N-formyl-L-alanine-amide was explored by the semi-empirical method AM1 coupled to the Multi Niche Crowding (MNC) genetic algorithm implemented in a package of programs developed in our laboratory. The structural and energy analysis of the resulting conformational space E(,ψ) exhibits 5 regions or minima ɣL, ɣD, ɛL, D and αD. The technique provides better detection of local and global minima within a reasonable time.

Ground-motion model for subduction earthquakes in northern South America

2021 ◽  
pp. 875529302110275
Author(s):  
Carlos A Arteta ◽  
Cesar A Pajaro ◽  
Vicente Mercado ◽  
Julián Montejo ◽  
Mónica Arcila ◽  
...  
Keyword(s):  
South America ◽  
Ground Motion ◽  
Ground Motions ◽  
Strong Motion ◽  
Motion Prediction ◽  
Depth Range ◽  
Ground Motion Prediction ◽  
Natural Period ◽  
Nazca Plate ◽  
Northern South America

Subduction ground motions in northern South America are about a factor of 2 smaller than the ground motions for similar events in other regions. Nevertheless, historical and recent large-interface and intermediate-depth slab earthquakes of moment magnitudes Mw = 7.8 (Ecuador, 2016) and 7.2 (Colombia, 2012) evidenced the vast potential damage that vulnerable populations close to earthquake epicenters could experience. This article proposes a new empirical ground-motion prediction model for subduction events in northern South America, a regionalization of the global AG2020 ground-motion prediction equations. An updated ground-motion database curated by the Colombian Geological Survey is employed. It comprises recordings from earthquakes associated with the subduction of the Nazca plate gathered by the National Strong Motion Network in Colombia and by the Institute of Geophysics at Escuela Politécnica Nacional in Ecuador. The regional terms of our model are estimated with 539 records from 60 subduction events in Colombia and Ecuador with epicenters in the range of −0.6° to 7.6°N and 75.5° to 79.6°W, with Mw≥4.5, hypocentral depth range of 4 ≤  Zhypo ≤ 210 km, for distances up to 350 km. The model includes forearc and backarc terms to account for larger attenuation at backarc sites for slab events and site categorization based on natural period. The proposed model corrects the median AG2020 global model to better account for the larger attenuation of local ground motions and includes a partially non-ergodic variance model.

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