Large Apparent Stresses from the Canterbury Earthquakes of 20. Suitability of rapid energy magnitude determinations for emergency response purposes. What is Sigma of the Stress Drop? Seismol. Global patterns of radiated seismic energy and apparent stress. Site response, attenuation and source spectra of S waves along the Guerrero, Mexico, subduction zone. Tectonic stress and the spectra of seismic shear waves from earthquakes. Strong ground motion characteristics observed in the 4 September 2010 Darfield, New Zealand earthquake. Average body-wave radiation coefficients. Simulation of ground motion using the stochastic method. Fault slip models of the 2010–2011 Canterbury, New Zealand, earthquakes from geodetic data and observations of postseismic ground deformation. Evolution of the 2010–2012 Canterbury earthquake sequence. Radiated seismic energy from coda measurements and no scaling in apparent stress with seismic moment. (Washington DC: American Geophysical Union).īaltay, A., Prieto, G., and Beroza, G.C. Objective determination of source parameters and similarity of earthquakes of different size. A model for the shape of the Fourier amplitude spectrum of acceleration at high frequencies. Separation of source and site effects by generalized inversion technique using the aftershock recordings of the 2009 L’Aquila earthquake. Spatial and temporal stress drop variations in small earthquakes near Parkfield, California. Stress drop scaling with earthquake size is nearly self-similar, and we identify lateral variations throughout Canterbury, in particular high stress drops at the fault edges of the two major events, the M W 7.2 Darfield and M W 6.2 Christchurch earthquakes.Īki, K. We find that stress drops range between 1 and 20 MPa with a median value of 5 MPa, which is a factor of 5 larger than the median stress drop previously estimated with the same method for crustal earthquakes in much more seismically active Japan. Source spectra were derived using a generalized spectral inversion technique and found to be well characterized by the ω −2 source model. Here we present a source parameter study of more than 200 events of the Canterbury sequence, covering the magnitude range M W 3–7.2. A better understanding of the seismic source signature of this sequence, in particular the stress release and its scaling with earthquake size, is crucial for future ground motion prediction and hazard assessment in Canterbury, but also of high interest for other low-to-moderate seismicity regions where high-quality records of large earthquakes are lacking. Ground motions during this sequence ranged up to extreme values of 2.2 g, recorded during the February 2011 M W 6.2 event beneath the city of Christchurch. The Canterbury earthquake sequence beginning with the 2010 M W 7.2 Darfield earthquake is one of the most notable and well-recorded crustal earthquake sequences in a low-strain-rate region worldwide and as such provides a unique opportunity to better understand earthquake source physics and ground motion generation in such a tectonic setting.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |