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A large seismic event struck the Chilean coast at 19.10:40 UT on May 22, 1960 (Plafker and Savage, 1970; Cifuentes, 1989; Cifuentes and Silver, 1989). The hypocenter was at 38.05°S – 72.34°W and the focal depth was estimated around 35 km, similar to the Sumatra earthquake. A recent relocation (Krawczyk and the SPOC Team, 2003) provides a more western and slightly deeper hypocenter > 73° 05’ W, 38° 15’ S, H = 38.5 km).
The records suggest that a large slow and silent foreshock took place on the deepest portion of the fault 15 minutes before the main shock, with a seismic moment comparable to that of the main event (Plafker and Savage, 1970; Kanamori and Cipar, 1974; Lund, 1982; Cifuentes, 1989; Cifuentes and Silver, 1989). Lund (1982) assumed that a solitary wave (soliton) was generated by this foreshock of 7.9 Mw. This precursor was detected on the strainmeter at Pasadena. It was modelled tentatively – using the observed surface deformation (Figure 10a) – by Linde and Silver (1989). The moderate uplift of the coastline was explained as a double slope fault that started to slip slowly at the deepest edge (Linde and Silver, 1989). In this case, the rupture would have to nucleate in the subcrustal ductile lithosphere where the stress produced by the subducting slab would dissipate.
reply to post by magnum1188
Are you saying you lurked for seven years without joining, and had to endure those ads in between the posts, the white background, ads flying everwhere, not seeing the avatars and signatures, why....that's dedication. Welcome to the funhouse, and please stick around and play.
Seven years lurking on ATS and I must say that TA you are amazing with the work and dedication you show here. There are others I know, but what I like about you is that you don't hesitate to show when things look bad. Keep up the great monitoring.
Now for an actual question. What magnitude of quake would we need to see now to continue to worry, or is that 7.6 already cause enough for concern?
reply to post by magnum1188
The current activity March-April has a Fault length of 235km, not enough for a Mag 9.
But it could start to unzip north or south at any time.
that 7.6Mw was 36km from the southern most event in the series so far, which is what is of concern, why is it not in the main bunch?.
The 2010 M8.8 aftershocks were quite widespread, over 780km Fault length, based on just the M5+ aftershocks over 2 months
EDIS Number: EQ-20140405-397035-CHL Common Alerting Protocol
Mercalli scale: 6
Date-Time [UTC]: 05 April, 2014 at 04:22:38 UTC
Local Date/Time: Saturday, April 05, 2014 at 04:22 at night at epicenter
Coordinate: 32° 41.970, 71° 22.698
Depth: 32.17 km (19.99 miles)
Hypocentrum: Shallow depth
Location: 0.18 km (0.11 miles) SE of Hacienda La Calera, Region de Valparaiso, Chile
We fInally had a shake in Santiago,(not an Earthquake), lasted 2 minutes, but luckily everything returned to normality fast
11:35PM, time in Chile. (10 to 4AM in London)
5,8 Richter. With Epicentrr in quillota.
No more news for now.
Santiago - There was a deep rumble and lots of shaking, scaring us to immediately head for the front door, many people who were already outside listening to music and other things, began screaming. Took awhile to calm down. Still shaking while writing this note.
mendoza - senti un leve movimiento estando sentada y el crujir de la puerta cerrada
GEOFON Near Coast Of Central Chile Apr 05 02:22 5.6 10 MAP I Felt It
Santiago - Heard the eerie rumbling/roaring noise and then everything started shaking. The door rattled, the ground beneath us was shaking and it was really scary. We were ready to run to the doors but then the shaking subsided.
Santiago - Ich spürte ein schütteln und dröhnen.