Mag. 4.5 earthquake - South Pacific Ocean, 49 km northwest of Valparaiso, Provincia de Valparaiso, Region de Valparaiso, Chile, on Thursday, 1 October 2015 at 14:31 (GMT)

This quake was likely an aftershock of the 7.8 quake Choapa, 36 km west of Illapel, Provincia de Choapa, Coquimbo Region, Chile, 16 September 2015 22:54 GMT, which had occurred 2 weeks earlier.
Mag. 4.5 earthquake  - South Pacific Ocean, 49 km northwest of Valparaiso, Provincia de Valparaiso, Region de Valparaiso, Chile, on Thursday, 1 October 2015 at 14:31 (GMT)

Light magnitude 4.5 earthquake at 11 km depth

1 Oct 15:10 UTC: First to report: GFZ after 39 minutes.
Date & time: 1 Oct 2015 14:31:11 UTC
Magnitude: 4.5
Depth: 11.0 km
Epicenter latitude / longitude: 32.81°S / 72.08°W (South Pacific Ocean, Chile)
Nearest volcano: Tupungatito (222 km / 138 mi)
Nearby towns and cities:
49 km (30 mi) WNW of Valparaiso (pop: 282,400) --> See nearby quakes!
55 km (34 mi) WNW of Viña del Mar (pop: 294,600) --> See nearby quakes!
65 km (40 mi) WNW of Quilpué (pop: 130,300) --> See nearby quakes!
71 km (44 mi) WNW of Villa Alemana (pop: 97,300) --> See nearby quakes!
78 km (49 mi) W of Quillota (pop: 67,800) --> See nearby quakes!
79 km (49 mi) WNW of Limache (Marga Marga) (pop: 35,900) --> See nearby quakes!
81 km (50 mi) W of Hacienda La Calera (pop: 49,100) --> See nearby quakes!
98 km (61 mi) NNW of San Antonio (pop: 85,700) --> See nearby quakes!
152 km (94 mi) WNW of Santiago (pop: 4,837,300) --> See nearby quakes!
166 km (103 mi) WNW of Puente Alto (pop: 510,400) --> See nearby quakes!
Primary data source: GFZ (German Research Centre for Geosciences)
Estimated released energy: 3.5 x 1011 joules (98.6 megawatt hours, equivalent to 84.8 tons of TNT) More info
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Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
M 4.511 kmOff Coast of Central ChileGFZ
M 4.330 km54 km al NO de ValparaísoGUG (U. Chile)

User reports for this quake (4)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Con Con (Chile, 52 km E of epicenter) : I heard a boom in the distance and waited to see if it was an earthquake or an explosion. It took a couple of seconds before I felt a short but decently strong jolt.Not special compared to what we were getting 10 days ago, but it was strange in that is was so quick and sharp. (reported through EMSC)
La Serena (Chile, 331 km N of epicenter) : short sharp jolt. (reported through EMSC)
(Chile, 148 km SE of epicenter) : No se sintio casi nada (reported through EMSC)
Viña del Mar (Chile, 53 km SE of epicenter) : Con ruído (reported through EMSC)
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Earlier earthquakes in the same area

Mag. 4.5 earthquake - South Pacific Ocean, 49 km northwest of Valparaiso, Provincia de Valparaiso, Region de Valparaiso, Chile, on Thursday, 1 October 2015 at 14:31 (GMT)
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