EarthScope Community Instrument Deployment in Chile
Maps and Figures

Deployment Map
(updated 04 April 2010)

Map (right) shows stations installed in the rupture region of the 2010 magnitude 8.8 earthquake (see key, upper left; Note - large blue square is Geoscope station PEL) as of 04 April  2010. When complete, 60 broadband seismometers and 10 accelerometers will be deployed at 60 sites. The goal of the deployment is to provide open access, high quality seismograms of aftershocks of the great earthquake to the seismologic community and the public. Scientific targets that can potentially be resolved with such a dataset include precise definition of the rupture region, imaging of the down-dip limit of co-seismic slip, recording possible non-volcanic tremor and slow slip events, and identification and characterization of transient changes to the down-going Nazca plate, overriding South America, and the interplate interface between them. (Image courtesy of R. Russo)

Click the image for a more detailed view.

Click the image for a more detailed view.

Seismicity Map

Map of the source region of the 2010 Chile earthquake. The large red circle is the mainshock epicenter (USGS, 2010), and other red dots are aftershocks with radius scaled proportional to seismic magnitude at the USGS locations. The gray focal mechanisms are GCMT (Ekström, 2010) solutions for larger aftershocks shown at their centroid locations. The approximate rupture extent of previous large earthquakes in the region are shown in pink or indicated by the offshore dashed curves, with the known seismic magnitudes given in the inset. The 1939 event near Concepción was an intra-slab rupture, but the others are believed to have been on the megathrust. (Image courtesy of T. Lay, C.J. Ammon, H. Kanamori, et al)

Click the image for a more detailed view.

Rupture Maps

Maps of the finite-fault slip distributions obtained by inversion of (a) teleseismic P and SH waves and (b) teleseismic P waves, SH waves, and R1 STFs. The background map is the same as the figure above, with the GCMT focal mechanism shown in the insets. The P and SH inversion allows for variable rake at each grid position, with the slip vectors for the hanging wall being shown, and their relative amplitudes contoured. The rupture velocity used for the P and SH inversion was 2.5 km/s and it was 2.0 km/s for the P, SH and R1 STF inversion. (Image courtesy of T. Lay, C.J. Ammon, H. Kanamori, et al)

Aftershock Map by Magnitude

Aftershocks of the February 27, 2010, great Chile earthquake (epicenter shown by star) as located by the US Geological Survey's National Earthquake Information Center. Aftershock epicenters are scaled by magnitude, as shown by the key (upper left). (Image courtesy of R. Russo)

Click the image for a more detailed view.

Aftershock Map by Depth

Aftershocks of the February 27, 2010, great Chile earthquake plotted by hypocentral depth. Data are from the US Geological Survey's National Earthquake Information Center Preliminary Determination of Epicenter (PDE). Hypocentral depths for many events were fixed at 35 km (open yellow symbols) because depth resolution is often poor when no recording stations directly overlie the earthquake. The aftershocks generally deepen eastward, consistent with the eastward dip of the Nazca plate beneath South America. The IRIS Community deployment in the rupture region will yield a much improved estimate of aftershock depths and an unprecedented image of the interface between the Nazca and South American plates in this region. (Image courtesy of R. Russo)

Click the image for a more detailed view.

Vertical Displacement Seismograms

18-hour record section from 407 USArray Transportable Array stations,
filtered from 5-120 seconds. (Image courtesy of R. Aster)

Click the image for a more detailed view.