Numerical modelling of the near feld velocity pulse like ground motions of the Northridge earthquake

Luo, Quanbo; Dai, Feng; Liu, Yi; Gao, Mengtan

doi:10.1007/s11600-020-00459-4

Artykuł - szczegóły

Tytuł artykułu

Numerical modelling of the near feld velocity pulse like ground motions of the Northridge earthquake

Autorzy

Luo Quanbo , Dai Feng , Liu Yi , Gao Mengtan

Wybrane pełne teksty z tego czasopisma

https://www.springer.com/journal/11600

Identyfikatory

DOI

10.1007/s11600-020-00459-4

Warianty tytułu

Języki publikacji

Abstrakty

The seismic records acquired during the 1994 MW6.7 Northridge earthquake provide important data for studying the pulse-like ground motions in the vicinity of reverse faults. We selected 106 horizontal records from 468 strong ground motion records in the near-feld region and rotated the original records into fault-parallel and fault-normal orientations. Large velocity pulses were simulated by the 3D fnite diference method using a kinematic source model and a velocity structure model. Regres sion analysis was performed on the simulated and observed amplitudes of the velocity time history and response spectrum using the least-squares method. Our results show that the released energy and rupture time of asperities in the source model have important efects on the near-feld velocity pulses, and the asperity near the initial rupture contributes more to the velocity pulses than does the asperity near the central region. The unidirectional and bidirectional characteristics of large velocity pulses are related to the thrust slip and rupture direction of the fault. The pulse period and the characteristic period are positively correlated with the rise time, and the pulse peak is regulated by multiple parameters of the subfaults. The distributions of the simulated PGV and Arias intensity agree well with the observed records, in which the contours exhibit asymmetric distribution and irregular elliptical attenuation in the near-feld region, and the distributions exhibit a signifcant directivity along the fault. Moreover, the attenuation rate decreases with increasing distance from the fault. In addition, the fault-normal component is larger than that on the fault-parallel component, and the former decays faster. Velocity pulses larger than 30 cm/s are most likely to be distributed within approximately 15 km from the fault plane of the Northridge earthquake. Thus, the revealed pattern of the near-feld velocity pulse-like ground motions indicates their close relation with the most severe earthquake efects.

Słowa kluczowe

Northridge earthquake finite diference method large velocity pulse source model PGV response spectrum Arias intensity

trzęsienie ziemi w Northridge impuls o dużej prędkości model źródłowy PGV spektrum odpowiedzi intensywność współczynnika Arias metoda różnic skończonych

Wydawca

Instytut Geofizyki PAN
Springer

Czasopismo

Acta Geophysica

Rocznik

2020

Tom

Vol. 68, no. 4

Strony

993--1006

Opis fizyczny

Bibliogr. 53 poz.

Twórcy

autor

Luo Quanbo

State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, Sichuan 610065, China

autor

Dai Feng

State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, Sichuan 610065, China

autor

Liu Yi

liuyi_scu@163.com

State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, Sichuan 610065, China

autor

Gao Mengtan

Institute of Geophysics, China Earthquake Administration, Beijing 100081, China

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021)

Typ dokumentu

Bibliografia

Identyfikator YADDA

bwmeta1.element.baztech-d9c95e09-8ee0-45d3-8aee-2b468a8246c2