A study on the determination of cumulative absolute velocity (CAV) threshold levels for Vrancea earthquakes

Hakan Alcik; Alexandru Marmureanu; Victorin Toader; Constantin Ionescu; Can Zulfikar

doi:10.30638/eemj.2017.016

A study on the determination of cumulative absolute velocity (CAV) threshold levels for Vrancea earthquakes

Hakan Alcik^*, Alexandru Marmureanu, Victorin Toader, Constantin Ionescu, Can Zulfikar

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Özet

Natural disasters from earthquakes can cause considerable damages, with potentially severe effects to urban environment. Last strong Vrancea earthquake on March 4, 1977 (M_w=7.4, depth=95km); tens of thousands of buildings damaged, many people injured and dead. Strong earthquakes in the Vrancea zone occur between 60-200 km depth within an almost vertical column. Bucharest Earthquake Early Warning (EEW) system detects earthquakes with a seismic network in the epicentral Vrancea region and issue a warning in Bucharest providing 20-25s warning time. In this study, we have investigated the relationships of the bracketed cumulative absolute velocity window (BCAV-W) approach versus epicentral distance and magnitude for Vrancea region. Firstly, a set of time histories contains 11 earthquakes, 111 strong ground motion records for intermediate depth earthquakes with different magnitudes (4.0≤M_w≤6.0) and epicentral distances (0-200 km) are analyzed to determine relations between the window size (W) and BCAV-W ratio. The BCAV-W computed for different windows time size 2s, 4s, 8s, 12s, 16s, 32s, 64s, 128s and 256s have the ratios 24%, 40%, 61%, 74%, 84%, 97%, 97%, 100% and 100% to the total BCAV respectively. The results show that there is no significant benefit to choose a window size more than 16s. Subsequently, rational threshold levels related to M_w=5.4+ earthquakes are determined as 0.28 m/s and 0.34 m/s related to 12-second and 16-second windows, respectively. The goal of the paper is to enhance EEW capability to decrease the effects of Vrancea earthquakes on urban and built environment.

Orijinal dil	İngilizce
Sayfa (başlangıç-bitiş)	141-147
Sayfa sayısı	7
Dergi	Environmental Engineering and Management Journal
Hacim	16
Basın numarası	1
DOI'lar	https://doi.org/10.30638/eemj.2017.016
Yayın durumu	Yayınlandı - Oca 2017
Harici olarak yayınlandı	Evet

Bibliyografik not

Publisher Copyright:
© 2017, Gheorghe Asachi Technical University of Iasi, Romania. All rights reserved.

Finansman

The authors appreciate two anonymous reviewers for their very constructive suggestions and critics, which helped in improving the manuscript. We also would like to thank to Prof. Dr. Gheorghe Marmureanu and to Dr. Y.M. Fahjan for their valuable suggestions and comments. This work was supported partially by a grant of the Romanian National Authority for Scientific Research, CNCS – UEFISCDI, project number PN-II-RU-TE-2012-3-0215 and by the Network of European Research Infrastructures for Earthquake Risk Assessment and Mitigation (NERA www.nera-eu.org) project, FP7, EC grant no. 262330.

Finansörler	Finansör numarası
Corporation for National and Community Service
European Commission	262330
Consiliul National al Cercetarii Stiintifice	PN-II-RU-TE-2012-3-0215
Seventh Framework Programme
Autoritatea Natională pentru Cercetare Stiintifică
Unitatea Executiva pentru Finantarea Invatamantului Superior, a Cercetarii, Dezvoltarii si Inovarii

BM SKH

Bu sonuç, aşağıdaki Sürdürülebilir Kalkınma Hedefine/Hedeflerine katkıda bulunur

Belgeye Erişim

10.30638/eemj.2017.016

Diğer Dosyalar ve Linkler

Link to publication in Scopus

Alıntı Yap

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title = "A study on the determination of cumulative absolute velocity (CAV) threshold levels for Vrancea earthquakes",

abstract = "Natural disasters from earthquakes can cause considerable damages, with potentially severe effects to urban environment. Last strong Vrancea earthquake on March 4, 1977 (Mw=7.4, depth=95km); tens of thousands of buildings damaged, many people injured and dead. Strong earthquakes in the Vrancea zone occur between 60-200 km depth within an almost vertical column. Bucharest Earthquake Early Warning (EEW) system detects earthquakes with a seismic network in the epicentral Vrancea region and issue a warning in Bucharest providing 20-25s warning time. In this study, we have investigated the relationships of the bracketed cumulative absolute velocity window (BCAV-W) approach versus epicentral distance and magnitude for Vrancea region. Firstly, a set of time histories contains 11 earthquakes, 111 strong ground motion records for intermediate depth earthquakes with different magnitudes (4.0≤Mw≤6.0) and epicentral distances (0-200 km) are analyzed to determine relations between the window size (W) and BCAV-W ratio. The BCAV-W computed for different windows time size 2s, 4s, 8s, 12s, 16s, 32s, 64s, 128s and 256s have the ratios 24%, 40%, 61%, 74%, 84%, 97%, 97%, 100% and 100% to the total BCAV respectively. The results show that there is no significant benefit to choose a window size more than 16s. Subsequently, rational threshold levels related to Mw=5.4+ earthquakes are determined as 0.28 m/s and 0.34 m/s related to 12-second and 16-second windows, respectively. The goal of the paper is to enhance EEW capability to decrease the effects of Vrancea earthquakes on urban and built environment.",

keywords = "Bucharest, Built environment, Cumulative absolute velocity, Earthquake early warning, Vrancea seismic area",

author = "Hakan Alcik and Alexandru Marmureanu and Victorin Toader and Constantin Ionescu and Can Zulfikar",

year = "2017",

month = jan,

doi = "10.30638/eemj.2017.016",

language = "English",

volume = "16",

pages = "141--147",

journal = "Environmental Engineering and Management Journal",

issn = "1582-9596",

publisher = "Gh. Asachi Technical University of Iasi",

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}

TY - JOUR

T1 - A study on the determination of cumulative absolute velocity (CAV) threshold levels for Vrancea earthquakes

AU - Alcik, Hakan

AU - Marmureanu, Alexandru

AU - Toader, Victorin

AU - Ionescu, Constantin

AU - Zulfikar, Can

PY - 2017/1

Y1 - 2017/1

N2 - Natural disasters from earthquakes can cause considerable damages, with potentially severe effects to urban environment. Last strong Vrancea earthquake on March 4, 1977 (Mw=7.4, depth=95km); tens of thousands of buildings damaged, many people injured and dead. Strong earthquakes in the Vrancea zone occur between 60-200 km depth within an almost vertical column. Bucharest Earthquake Early Warning (EEW) system detects earthquakes with a seismic network in the epicentral Vrancea region and issue a warning in Bucharest providing 20-25s warning time. In this study, we have investigated the relationships of the bracketed cumulative absolute velocity window (BCAV-W) approach versus epicentral distance and magnitude for Vrancea region. Firstly, a set of time histories contains 11 earthquakes, 111 strong ground motion records for intermediate depth earthquakes with different magnitudes (4.0≤Mw≤6.0) and epicentral distances (0-200 km) are analyzed to determine relations between the window size (W) and BCAV-W ratio. The BCAV-W computed for different windows time size 2s, 4s, 8s, 12s, 16s, 32s, 64s, 128s and 256s have the ratios 24%, 40%, 61%, 74%, 84%, 97%, 97%, 100% and 100% to the total BCAV respectively. The results show that there is no significant benefit to choose a window size more than 16s. Subsequently, rational threshold levels related to Mw=5.4+ earthquakes are determined as 0.28 m/s and 0.34 m/s related to 12-second and 16-second windows, respectively. The goal of the paper is to enhance EEW capability to decrease the effects of Vrancea earthquakes on urban and built environment.

AB - Natural disasters from earthquakes can cause considerable damages, with potentially severe effects to urban environment. Last strong Vrancea earthquake on March 4, 1977 (Mw=7.4, depth=95km); tens of thousands of buildings damaged, many people injured and dead. Strong earthquakes in the Vrancea zone occur between 60-200 km depth within an almost vertical column. Bucharest Earthquake Early Warning (EEW) system detects earthquakes with a seismic network in the epicentral Vrancea region and issue a warning in Bucharest providing 20-25s warning time. In this study, we have investigated the relationships of the bracketed cumulative absolute velocity window (BCAV-W) approach versus epicentral distance and magnitude for Vrancea region. Firstly, a set of time histories contains 11 earthquakes, 111 strong ground motion records for intermediate depth earthquakes with different magnitudes (4.0≤Mw≤6.0) and epicentral distances (0-200 km) are analyzed to determine relations between the window size (W) and BCAV-W ratio. The BCAV-W computed for different windows time size 2s, 4s, 8s, 12s, 16s, 32s, 64s, 128s and 256s have the ratios 24%, 40%, 61%, 74%, 84%, 97%, 97%, 100% and 100% to the total BCAV respectively. The results show that there is no significant benefit to choose a window size more than 16s. Subsequently, rational threshold levels related to Mw=5.4+ earthquakes are determined as 0.28 m/s and 0.34 m/s related to 12-second and 16-second windows, respectively. The goal of the paper is to enhance EEW capability to decrease the effects of Vrancea earthquakes on urban and built environment.

KW - Bucharest

KW - Built environment

KW - Cumulative absolute velocity

KW - Earthquake early warning

KW - Vrancea seismic area

UR - http://www.scopus.com/inward/record.url?scp=85045047379&partnerID=8YFLogxK

U2 - 10.30638/eemj.2017.016

DO - 10.30638/eemj.2017.016

M3 - Article

AN - SCOPUS:85045047379

SN - 1582-9596

VL - 16

SP - 141

EP - 147

JO - Environmental Engineering and Management Journal

JF - Environmental Engineering and Management Journal

IS - 1

ER -

A study on the determination of cumulative absolute velocity (CAV) threshold levels for Vrancea earthquakes

Özet

Bibliyografik not

Finansman

BM SKH

Belgeye Erişim

Diğer Dosyalar ve Linkler

Parmak izi

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