scholarly journals A declustered earthquake catalog for the Iranian Plateau

2015 ◽  
Vol 57 (6) ◽  
Author(s):  
Seyed Hasan Mousavi-Bafrouei ◽  
Noorbakhsh Mirzaei ◽  
Elham Shabani
Keyword(s):  
Seismic Hazard ◽  
Hazard Analysis ◽  
Time Windows ◽  
Recurrence Time ◽  
Earthquake Catalog ◽  
Magnitude Of Completeness ◽  
Iranian Plateau ◽  
Seismic Stations ◽  
International Agencies ◽  
Seismotectonic Province

A unified catalog of earthquakes in Iran and adjacent regions (the area bounded in 22<sup>º</sup>-42<sup>º</sup>N and 42<sup>º</sup>-66<sup>º</sup>E) covering the period of 4<sup>th</sup> century B.C. through 2012 with M<sub>w</sub>≥4 is provided. The catalog includes all events for which magnitude have been determined by international agencies and most reliable individual sources. Since the recurrence time of maximum credible earthquake cannot be directly estimated from the m<sub>b</sub>, empirical formulae are established to convert m<sub>b</sub> to M<sub>s</sub>, m<sub>b</sub> to M<sub>w</sub> and M<sub>s</sub> to M<sub>w</sub> for each major seismotectonic province separately. The unified catalog is declustered using conjugated distance-time windows. In order to estimate completeness thresholds, magnitude-time (M-T) diagram and Stepp’s method are applied on the declustered catalog for each seismotectonic province. The magnitude of completeness (M<sub>c</sub>) decreases with development of local and regional seismic stations. The results of present study are particularly important in seismic hazard analysis in Iran.

Seismic Hazard Estimation in East China Offshore Areas

2013 ◽  
Vol 690-693 ◽  
pp. 1158-1167
Author(s):  
Li Fang Zhang ◽  
Yan Ju Peng ◽  
Zhen Ming Wang
Keyword(s):  
Seismic Hazard ◽  
Seismic Activity ◽  
Hazard Analysis ◽  
Seismic Hazard Analysis ◽  
East China ◽  
Earthquake Catalog ◽  
Ground Acceleration ◽  
Study Region ◽  
Seismicity Model ◽  
Seismic Hazard Estimation

In this study, we chose East China offshore areas as study region(N25°~41°，E117°~126°).According to the tectonic environments and characteristics of earthquake the seismotectonic units were established, taking Gaussian spatially smoothing only based on the input earthquake catalog, and fault-rupture-oriented elliptical smoothing to calculate the seismic activity rate in each cells. The maps for the distribution of horizontal peak ground acceleration with 10% probability of exceedance in 50 years were obtained through using the method of seismic hazard analysis based on cell source. While the total number of earthquakes unchanged, two-stage smoothing procedure deals with the error of epicenter location, contains the seismotectonic information in elliptical smoothing seismicity model. This method build up a simple and easy methodology of probabilistic seismic hazard analysis, especially for those place where not yet been clearly master the seismic tectonic information and with distributed Seismic activity.

Preliminary Volcanic Seismic Hazard Analysis for Tatun Volcano Group in Northern Taiwan

2013 ◽  
Vol 479-480 ◽  
pp. 1061-1065
Author(s):  
Cheng Yu Pan ◽  
Yuan Cheih Wu ◽  
Chih Wei Chang
Keyword(s):  
Seismic Hazard ◽  
Power Plants ◽  
Hot Spring ◽  
Hazard Analysis ◽  
Source Parameters ◽  
Seismic Source ◽  
Seismic Hazard Analysis ◽  
Earthquake Catalog ◽  
Source Characterization ◽  
Taipei Basin

Tatun volcano group is located in north Taiwan and near Taipei Basin where several million people live there. Although it provides hot spring and landscape for citizens and keeps calm most of time, the threat remains, particularly for the two nearby nuclear power plants. This paper discusses the seismic hazard of volcanic seismic source including source characterization of Tatun volcano group, probabilistic seismic hazard analysis (PSHA), and its preliminary seismic hazard result. Based on nuclear regulatory requirement for PSHA, the uncertainties of source parameters are vital, such as geometry, maximum earthquake, and activity relating earthquake catalog selection, so the first-time seismic source characterization workshop for volcano is held to let domestic experts discuss their hypotheses and investigation result. Hence, the renewed source parameters can represent current geo-science for Tatun volcanic seismic source, and the process of PSHA can lead the better way to combine the result of different research projects for Tatun volcano.

Ground Motion Distribution Analysis about Taipei-101 in Earthquake

2013 ◽  
Vol 671-674 ◽  
pp. 1346-1350
Author(s):  
Zhao Lu ◽  
Ren Yu Zuo ◽  
Xiang Ruan
Keyword(s):  
Seismic Hazard ◽  
Ground Motion ◽  
Hazard Analysis ◽  
Tall Building ◽  
Seismic Hazard Analysis ◽  
Earthquake Catalog ◽  
Distribution Analysis ◽  
Chi Square ◽  
Chi Square Test ◽  
Taipei 101

It is important for tall building to infer seismic hazard analysis. Recently, researchers paid great efforts to study the seismic hazard analysis using the method of probabilistic seismic hazard analysis (PSHA), and PSHA has been proved to be sound and popular. The PSHA method is not new. However, the use of PSHA in China is not extensive. The purpose of this paper is to explore the use of ground motion distribution analysis about one typical tall building Taipei-101. Based on the earthquake catalog around Taiwan with more than 50,000 events over 100-years of recording, the author takes Taipei-101’s geographic coordination as object to do ground motion distribution analysis. The research shows that ground motion is affected significantly by service year, and the chi-square test applied in testing Annual ground motion distribution better than K-S test, In addition, Bernoulli distribution is verified reasonable in evaluating the entire service year ground motion distribution.

Development of the 2017 national seismic hazard maps of Indonesia

2020 ◽  
Vol 36 (1_suppl) ◽  
pp. 112-136
Author(s):  
Masyhur Irsyam ◽  
Phil R Cummins ◽  
M Asrurifak ◽  
Lutfi Faizal ◽  
Danny Hilman Natawidjaja ◽  
...  
Keyword(s):  
Seismic Hazard ◽  
Epistemic Uncertainty ◽  
Hazard Analysis ◽  
Active Faults ◽  
Seismic Hazard Assessment ◽  
Velocity Model ◽  
National Standards ◽  
Earthquake Catalog ◽  
Hazard Maps ◽  
Seismic Hazard Maps

Indonesia is one of the most seismically active countries in the world, and its large, vulnerable population makes reliable seismic hazard assessment an urgent priority. In 2016, the Indonesian Ministry of Public Works and Housing established a team of earthquake scientists and engineers tasked with improving the input data available for revising the national seismic hazard map. They compiled results of recent active fault studies using geological, geophysical, and geodetic observations, as well as a new comprehensive earthquake catalog including hypocenters relocated in a three-dimensional velocity model. Seismic hazard analysis was undertaken using recently developed ground motion prediction equations (GMPEs), and logic trees for the inclusion of epistemic uncertainty associated with different choices for GMPEs and earthquake recurrence models. The new seismic hazard maps establish the importance of active faults and intraslab seismicity, as well as the subduction megathrust, in determining the level of seismic hazard, especially in onshore, populated areas. The new Indonesian hazard maps will be used to update national standards for design of earthquake-resilient buildings and infrastructure.

Seismic Hazard in Syria Based on Completeness Analysis and Assessment

2018 ◽  
Vol 13 (1) ◽  
pp. 153-167
Author(s):  
Ahmed Alhourani ◽  
Junji Kiyono ◽  
Aiko Furukawa ◽  
Hussam Eldein Zaineh ◽  
◽  
...  
Keyword(s):  
Seismic Hazard ◽  
Hazard Analysis ◽  
Region Of Interest ◽  
Seismic Energy ◽  
Return Periods ◽  
Hazard Maps ◽  
Magnitude Of Completeness ◽  
Ground Acceleration ◽  
Seismic Catalog

An important criterion for conducting an accurate seismic hazard analysis and assessment is the compiling of a representative and completehistorical seismic catalog for the region of interest. This paper describes the procedure to assemble a full earthquake events catalog for Syria from the years 37 AD to 2011 AD. The procedure starts with improving the quality of the compiled full catalog by eliminating manmade events by choosing a cutoff magnitude of 2.5; and by eliminating the potential aftershocks and afforeshcks using an appropriate declustering method. To examine the quality of the resultant seismic catalog (after eliminating artificial, aftershock and afforeshok earthquake) the magnitude of completeness (MC) was calculated and the distribution of MC with time showed an overall good quality of the adopted complete catalog. The adopted complete seismic catalog is then used to generate peak ground acceleration hazard maps for 475, 1000 and 2475 years return periods. The study also concludes that to accommodate for the quiescence of the DSFS and potential undetected buildup and release of seismic energy it is important to introduce 1000 and 2475 years return periods seismic hazard maps especially in the design of important structures.

scholarly journals Time-Dependent Seismic Hazard Analysis for Induced Seismicity: The Case of St Gallen (Switzerland), Geothermal Field

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2747
Author(s):  
Vincenzo Convertito ◽  
Hossein Ebrahimian ◽  
Ortensia Amoroso ◽  
Fatemeh Jalayer ◽  
Raffaella De Matteis ◽  
...  
Keyword(s):  
Seismic Hazard ◽  
Ground Motion ◽  
Induced Seismicity ◽  
Hazard Analysis ◽  
Geothermal Field ◽  
Seismic Hazard Analysis ◽  
Time Dependent ◽  
Recurrence Time ◽  
Maximum Magnitude ◽  
Small Magnitude

Reliable seismic hazard analyses are crucial to mitigate seismic risk. When dealing with induced seismicity the standard Probabilistic Seismic Hazard Analysis (PSHA) has to be modified because of the peculiar characteristics of the induced events. In particular, the relative shallow depths, small magnitude, a correlation with field operations, and eventually non-Poisson recurrence time. In addition to the well-known problem of estimating the maximum expected magnitude, it is important to take into account how the industrial field operations affect the temporal and spatial distribution of the earthquakes. In fact, during specific stages of the project the seismicity may be hard to be modelled as a Poisson process—as usually done in the standard PSHA—and can cluster near the well or migrate toward hazardous known or—even worse—not known faults. Here we present a technique in which we modify the standard PSHA to compute time-dependent seismic hazard. The technique allows using non-Poisson models (BPT, Weibull, gamma and ETAS) whose parameters are fitted using the seismicity record during distinct stages of the field operations. As a test case, the procedure has been implemented by using data recorded at St. Gallen deep geothermal field, Switzerland, during fluid injection. The results suggest that seismic hazard analyses, using appropriate recurrence model, ground motion predictive equations, and maximum magnitude allow the expected ground-motion to be reliably predicted in the study area. The predictions can support site managers to decide how to proceed with the project avoiding adverse consequences.

Seismic activity in stable continental regions

2021 ◽  
Author(s):  
Manel Labidi ◽  
Beau Whitney ◽  
Stéphane Drouet
Keyword(s):  
Seismic Hazard ◽  
Hazard Analysis ◽  
Plate Boundary ◽  
Internal Variability ◽  
Initial Step ◽  
Seismic Hazard Analysis ◽  
Earthquake Catalog ◽  
Global Database ◽  
Seismicity Parameters ◽  
Stable Continental Regions

&lt;div&gt; &lt;p&gt;&lt;span&gt;Stable continental regions (SCRs) have low seismicity and large magnitude earthquakes are infrequent and diffuse compared to plate boundary settings. Because of this, seismicity parameters required for seismic hazard analysis (SHA) are difficult to constrain. A method to overcome this challenge involves using an analogue approach to generate seismic hazard inputs in SCRs. Seismic hazard analysis of these regions develops recurrence parameters by drawing upon data from a larger global database than what is typically done for plate boundary regions. This is completed by choosing regions that are considered seismotectonically analogous and then amalgamating data from the regions to generate larger and perceivably more robust seismicity data sets. Historically, this is done by considering all SCRs as analogous and including all of their data into the analysis. &lt;/span&gt;&lt;/p&gt; &lt;p&gt;&lt;span&gt;This study refines and updates this approach by assessing whether there is internal variability of seismogenic potential within SCR crust that can be distinguished by comparing properties of the crust to seismicity. We completed this analysis by: (1) compiling a global homogeneous earthquake catalog for earthquakes &gt;= Mw 2 up to July 2020 which includes historical and instrumental events; (2) subdividing global SCR crust into five geological domains that distinguish crustal criteria within SCRs; (3) calculating and comparing the seismic parameters between the different SCRs and sub-domains to better understand the range in values across different SCRs and determine if there is statistically observable variation between sub-domains&lt;/span&gt;. &lt;span&gt;Our results provide an initial step towards redefining what crustal characteristics define analog regions for use in seismic hazard studies.&lt;/span&gt;&lt;/p&gt; &lt;/div&gt;

PEMETAAN DAERAH RENTAN GEMPA BUMI SEBAGAI DASAR PERENCANAAN TATA RUANG DAN WILAYAH DI PROVINSI SULAWESI BARAT

KURVATEK ◽  
2017 ◽  
Vol 1 (2) ◽  
pp. 41-47
Author(s):  
Marinda noor Eva
Keyword(s):  
Seismic Hazard ◽  
Hazard Analysis ◽  
Probabilistic Seismic Hazard Analysis ◽  
Seismic Hazard Analysis ◽  
Probabilistic Seismic Hazard

Penelitian mengenai daerah rawan gempa bumi ini menggunakan Metode Probabilistic Seismic Hazard Analysis (PSHA) di Provinsi Sulawesi Barat, dengan tujuan untuk memetakan tingkat kerawanan bahaya gempa bumi di Kabupaten Mamasa. Penelitian ini menggunakan data kejadian gempa bumi di Pulau Sulawesi dan sekitarnya dari tahun 1900 – 2015. Hasil pengolahan PSHA menggunakan Software Ez-Frisk 7.52 yang menghasilkan nilai hazard di batuan dasar pada kondisi PGA (T = 0,0 sekon), dengan periode ulang 500 tahun dan 2500 tahun berkisar antara (149,54 – 439,45) gal dan (287,18 – 762,81) gal. Nilai hazard di batuan dasar dengan kondisi spektra T = 0,2 sekon untuk periode ulang 500 tahun dan 2500 tahun adalah (307,04 – 1010,90) gal dan (569,48 – 1849,78) gal. Nilai hazard di batuan dasar dengan kondisi spektra T = 1,0 sekon untuk periode ulang 500 tahun dan 2500 tahun diperoleh nilai (118,01 – 265,75) gal dan (223,74 – 510,92) gal. Berdasarkan analisis PSHA, nilai PGA di Provinsi Sulawesi Barat dominan dipengaruhi oleh sumber gempa sesar.

PSHA software review based on the Monte Carlo method

2020 ◽  
pp. 14-24
Author(s):  
V.A. Mironov ◽  
S.A. Peretokin ◽  
K.V. Simonov
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Seismic Hazard ◽  
Hazard Analysis ◽  
Software Review ◽  
Seismic Hazard Analysis ◽  
Probabilistic Seismic Hazard ◽  
Test Calculation ◽  
Seismic Surveys ◽  
The Monte Carlo Method

The article is a continuation of the software research to perform probabilistic seismic hazard analysis (PSHA) as one of the main stages in engineering seismic surveys. The article provides an overview of modern software for PSHA based on the Monte Carlo method, describes in detail the work of foreign programs OpenQuake Engine and EqHaz. A test calculation of seismic hazard was carried out to compare the functionality of domestic and foreign software.

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