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Update 16:38 UTC : This earthquake, which is not extremely dangerous if the preliminary data are correct (depth +150 km), will be felt ina very wide radius of hundreds of km. We do not have yet official data.
Update 16:46 UTC : Please omit the depth of Geofon in the listings. 10 km in in many cases reported as a “we do not know it yet” depth. Both USGS and EMSC are reporting a very weakening 168 and 140 km depth. This depth is normal as this is clearly a subduction earthquake generated by a moving Nazca plate who did hang below the continental South American Plate.
Update 16:49 UTC : A tsunami is NOT possible because of the epicenter who is located below land (far inland)
Update 16:54 UTC : First incoming reports are talking about a weak to very weak shaking, which is exactly what we did expect. In some cases a moderate shaking may be experienced, but we are quiet sure that this earthquake will not generate serious damage or injuries.
Important Update 16:57 UTC : USGS has just decreased the Magnitude from M7.4 to M7.1 at a depth of 150 km. These are very good numbers which confirm the incoming intensity (shaking) values
Update 17:01 UTC :
* 2 million people are expected to have felt a moderate shaking
* 14.5 million people a light shaking and 10 million people a weak shaking. These 3 shaking values are normally NOT generating any damage. Small cracks in walls and falling objects are often experienced though.
Update 17:08 UTC : Most important cities near the epicenter and their (probable) experienced shaking values
Moderate MMI V shaking : San Agustin 9000 people, Isnos 5000, Saladoblanco 1000, Pitalito 53000, Palestina 2000 and Elias 1000
Large intermediate-depth earthquakes (those occurring between depths of approximately 70 and 300 km) are relatively limited in size and spatial extent in South America, and occur within the Nazca plate as a result of internal deformation within the subducting plate. These earthquakes generally cluster beneath northern Chile and southwestern Bolivia, and to a lesser extent beneath northern Peru and southern Ecuador, with depths between 110 and 130 km. Most of these earthquakes occur adjacent to the bend in the coastline between Peru and Chile. The most recent large intermediate-depth earthquake in this region was the 2005 M7.8 Tarapaca, Chile earthquake.