The Mw 6.2 Christchurch earthquake of February 2011: preliminary report

被引：152

作者：

Kaiser, A. ^{[1
]}

Holden, C. ^{[1
]}

Beavan, J. ^{[1
]}

Beetham, D. ^{[1
]}

Benites, R. ^{[1
]}

Celentano, A. ^{[5
]}

Collett, D. ^{[2
]}

Cousins, J. ^{[1
]}

Cubrinovski, M. ^{[3
]}

Dellow, G. ^{[1
]}

Denys, P. ^{[4
]}

Fielding, E. ^{[6
]}

Fry, B. ^{[1
]}

Gerstenberger, M. ^{[1
]}

Langridge, R. ^{[1
]}

Massey, C. ^{[1
]}

Motagh, M. ^{[7
]}

Pondard, N. ^{[1
]}

McVerry, G. ^{[1
]}

Ristau, J. ^{[1
]}

Stirling, M. ^{[1
]}

Thomas, J. ^{[8
]}

Uma, S. R. ^{[1
]}

Zhao, J. ^{[1
]}

机构：

[1] GNS Sci, Lower Hutt, New Zealand

[2] Land Informat New Zealand, Wellington, New Zealand

[3] Univ Canterbury, Christchurch 1, New Zealand

[4] Univ Otago, Sch Surveying, Dunedin, New Zealand

[5] E GEOS ASI, Matera, Italy

[6] JPL Caltech, Pasadena, CA USA

[7] GFZ, Potsdam, Germany

[8] Land Informat New Zealand, Christchurch, New Zealand

来源：

NEW ZEALAND JOURNAL OF GEOLOGY AND GEOPHYSICS | 2012年 / 55卷 / 01期

基金：

美国国家航空航天局;

关键词：

Canterbury earthquake sequence; Christchurch earthquake; strong ground motion; earthquake source model; liquefaction; landslides; NEW-ZEALAND; SOUTH-ISLAND; DARFIELD CANTERBURY; SLIP DISTRIBUTION; SOURCE PARAMETERS; NORTH CANTERBURY; SEISMIC HAZARD; ALPINE FAULT; SOURCE MODEL; HOPE FAULT;

D O I：

10.1080/00288306.2011.641182

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

A moment magnitude (M-w) 6.2 earthquake struck beneath the outer suburbs of Christchurch, New Zealand's second largest city, on 22 February 2011 local time. The Christchurch earthquake was the deadliest in New Zealand since the 1931 M-w 7.8 Hawkes Bay earthquake and the most expensive in New Zealand's recorded history. The effects of the earthquake on the region's population and infrastructure were severe including 181 fatalities, widespread building damage, liquefaction and landslides. The Christchurch earthquake was an aftershock of the M-w 7.1 Darfield Earthquake of September 2010, occurring towards the eastern edge of the aftershock zone. This was a low recurrence earthquake for New Zealand and occurred on a fault unrecognised prior to the Darfield event. Geodetic and seismological source models show that oblique-reverse slip occurred along a northeast-southwest-striking fault dipping southeast at c. 69 degrees, with maximum slip at 3-4 km depth. Ground motions during the earthquake were unusually large at near-source distances for an earthquake of its size, registering up to 2.2 g (vertical) and 1.7 g (horizontal) near the epicentre and up to 0.8 g (vertical) and 0.7 g (horizontal) in the city centre. Acceleration response spectra exceeded 2500 yr building design codes and estimates based on standard New Zealand models. The earthquake was associated with high apparent stress indicative of a strong fault. Furthermore, rupture in an updip direction towards Christchurch likely led to strong directivity effects in the city. Site effects including long period amplification and near-surface effects also contributed to the severity of ground motions.

引用

页码：67 / 90

页数：24

共 70 条

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