Figure 2 - uploaded by Maria Lancieri
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The M w 7.7 Tocopilla earthquake of 2007 November 14. The epicentre of the main event is shown with a red star and the black ellipses show the slip patches of the main event determined by Peyrat et al. (2010). The focal mechanisms from the global centroid moment tensor catalogue show the main aftershocks of the event. Two shallow thrust aftershocks occurred on 2007 November 15 offshore Mejillones peninsula. The slabpush event of M w 6.9 of 2007 December 16 is shown with a yellow star. The stations of the task force (TF) seismic network that was deployed 2 weeks after the mainshock are shown with magenta triangles. The green triangles depict the location of the permanent IPOC network.
Source publication
The Northern Chile gap is generally considered to the site of the next megathurst event in Chile. The Tocopilla earthquake of 14 November 2007 (Mw 7.8) and aftershock series broke the southern end of this gap. The Tocopilla event ruptured a narrow strip of 120 km of length and a width that (Peyrat et al.; Delouis et al. 2009) estimated as 30 km. Th...
Contexts in source publication
Context 1
... 2007 November 14 the Tocopilla earthquake of magnitude M w 7.7 (Delouis et al. 2009;Peyrat et al. 2010) broke the southern part of the Northern Chile gap. The slip distribution of this earth- quake, shown in Fig. 2, was obtained by kinematic inversion of the source (Peyrat et al. 2010) using far and near field data. The slip distribution was composed of two main patches: the rupture started in the northern patch and propagated towards the south breaking a second patch that covers an area close to the ocean and stopped at the Mejillones peninsula. ...
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... off-shore the Mejillones peninsula (Peyrat et al. 2010;Schurr et al. 2012). Both are thrust events with the same mechanism as the Tocopilla earth- quake. In the same zone we identified five events of magnitude M w larger than 6 that occurred during the first week after the Tocopilla earthquake ( Lancieri et al. 2012;Schurr et al. 2012) (see Fig. ...
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... Tocopilla aftershocks were locally recorded by the IPOC and TF networks in the North of Chile (Fig. 2). The IPOC network was installed in 2006 thanks to an agreement between the International Laboratory Montessus de Ballore (LIA) and the German Research Centre for Geosciences (GFZ) with the aim of monitoring the seis- mic gap of northern Chile. The IPOC network was composed of 12 stations equipped with broadband seismometers (STS-2) and ...
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... composed of 12 stations equipped with broadband seismometers (STS-2) and accelerometers (GMG-5 and Episensor FBA ES-T), spanning the northern Chile gap with an inter-station distance of 80 km. The net- work was operational in 2007 November when the main event and the entire aftershock sequence were recorded at the seven southern- most stations (Fig. 2). The PB04 station was located right above the hypocentre of the main event and station PB05 was situated above the Michilla slab-push event of 2007 December 16. The IPOC net- work has been continuously improved and is currently operational in Northern Chile. In order to understand the activity of the southern part of the rupture, from ...
Context 5
... expected, the errors increase towards the trench for the two models (Fig. S2). During period I, the network geometry dominated the uncertainties, so that we were not able to decide which model produced better locations based on the formal errors. For period II (see Table 1), the errors in depth determination were improved with a mean value of 1.73 km for the 1-D model and 2.15 km for the 2-D model. Finally for ...
