Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 20-12-2010 and time 10:31:11 (UTC) in region 4 km E Spoleto (PG)

A magnitude ML 1.5 earthquake occured in region: 4 km E Spoleto (PG), on

  • 20-12-2010 10:31:11 (UTC)
  • 20-12-2010 11:31:11 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7310, 12.7850 at 8 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Spoleto PG 4 38218 38218
Sant'Anatolia di Narco PG 4 564 38782
Scheggino PG 4 461 39243
Vallo di Nera PG 8 364 39607
Campello sul Clitunno PG 10 2442 42049
Ferentillo TR 12 1913 43962
Poggiodomo PG 13 117 44079
Castel Ritaldi PG 14 3278 47357
Cerreto di Spoleto PG 15 1075 48432
Montefranco TR 15 1276 49708
Monteleone di Spoleto PG 16 599 50307
Arrone TR 16 2763 53070
Trevi PG 17 8469 61539
Polino TR 17 233 61772
Cascia PG 19 3217 64989
Acquasparta TR 20 4778 69767

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km NE of Terni (111501 inhabitants)
26 Km S of Foligno (57155 inhabitants)
53 Km SE of Perugia (166134 inhabitants)
66 Km NE of Viterbo (67173 inhabitants)
66 Km NW of L'Aquila (69753 inhabitants)
76 Km W of Teramo (54892 inhabitants)
81 Km N of Guidonia Montecelio (88673 inhabitants)
85 Km N of Tivoli (56533 inhabitants)
96 Km N of Roma (2864731 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		Md 1.2
ML 1.5 		2010-12-20
10:31:11		 42.731 12.785 8 2014-10-21
12:27:13		 Bollettino Sismico Italiano INGV 1152579
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2010-12-20 10:31:11 ± 0.26
Latitude 42.7310 ± 0.0036
Longitude 12.7850 ± 0.0049
Depth (km) 8 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-SISPICK
Event type earthquake
Origin ID 1152579

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 476
Semi-minor axis of confidence ellipse (meter) 174
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 316
Circular confidence region, given by single value of horizontal uncertainty (meter) 565.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 147
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.28778
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 4
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations
Type of magnitude ML
Reference to an origin 1152579
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-05 22:25:19

Md:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations
Type of magnitude Md
Reference to an origin 1152579
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-05 22:25:19
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.STR4.BHN. 2010-12-20T10:32:27.28 10.0 undecidable manual Sg 0 0 0
IV.STR3.BHN. 2010-12-20T10:32:26.55 10.0 undecidable manual Pg 0 0 0
IV.STR4.BHN. 2010-12-20T10:32:20.95 10.0 undecidable manual Pg 0 0 0
MN.VSL.HHE. 2010-12-20T10:32:15.64 10.0 undecidable manual Pg 0 0 0
IV.SASS.HHE. 2010-12-20T10:32:08.65 10.0 undecidable manual Pg 0 0 0
CH.BERNI.HHZ. 2010-12-20T10:31:48.56 10.0 undecidable manual Pg 0 0 0
NI.AGOR.HHZ. 2010-12-20T10:31:34.38 10.0 undecidable manual Pg 0 0 0
IV.CESI.HHN. 2010-12-20T10:31:23.10 0.1 undecidable manual Sg 18 31.9458 0.067 98
IV.ZCCA.HHE. 2010-12-20T10:31:21.28 10.0 undecidable manual Pg 0 0 0
IV.NRCA.HHN. 2010-12-20T10:31:21.96 0.1 undecidable manual Sg 67 29.1486 -0.128 97
IV.LNSS.HHZ. 2010-12-20T10:31:20.75 0.1 undecidable manual Sg 124 25.1526 -0.025 100
IV.CESX.HHE. 2010-12-20T10:31:19.64 0.1 undecidable manual Sg 231 21.4674 0.103 99
IV.CESI.HHN. 2010-12-20T10:31:18.28 0.1 undecidable manual Pg 18 31.9458 0.054 98
IV.LNSS.HHZ. 2010-12-20T10:31:17.15 0.1 undecidable manual Pg 124 25.1526 0.226 96
IV.NRCA.HHN. 2010-12-20T10:31:17.64 0.1 undecidable manual Pg 67 29.1486 -0.041 99
IV.CESX.HHE. 2010-12-20T10:31:15.96 0.1 undecidable manual Pg 231 21.4674 -0.248 96
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download