Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 21-08-2013 and time 01:54:31 (Italy) in region 6 km E Cerreto di Spoleto (PG)

A magnitude ML 0.9 earthquake occured in region: 6 km E Cerreto di Spoleto (PG), on

  • 20-08-2013 23:54:31 (UTC)
  • 21-08-2013 01:54:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8420, 12.9830 at 10 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
Cerreto di Spoleto PG 6 1075 1075
Preci PG 6 724 1799
Sellano PG 7 1079 2878
Norcia PG 11 4957 7835
Vallo di Nera PG 13 364 8199
Visso MC 13 1107 9306
Cascia PG 14 3217 12523
Poggiodomo PG 15 117 12640
Castelsantangelo sul Nera MC 15 281 12921
Campello sul Clitunno PG 17 2442 15363
Sant'Anatolia di Narco PG 17 564 15927
Monte Cavallo MC 17 145 16072
Ussita MC 17 444 16516
Scheggino PG 19 461 16977
Trevi PG 20 8469 25446

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km E of Foligno (57155 inhabitants)
42 Km NE of Terni (111501 inhabitants)
57 Km SE of Perugia (166134 inhabitants)
62 Km W of Teramo (54892 inhabitants)
64 Km NW of L'Aquila (69753 inhabitants)
86 Km NE of Viterbo (67173 inhabitants)
96 Km N of Guidonia Montecelio (88673 inhabitants)
97 Km SW of Ancona (100861 inhabitants)
99 Km N of Tivoli (56533 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 		ML 0.9 2013-08-20
23:54:31		 42.8425 12.9827 10 2015-01-20
11:28:30		 Bollettino Sismico Italiano INGV 4764761
Reviewed
Rev100 		ML 0.8 2013-08-20
23:54:30		 42.8443 12.9823 10 2014-10-21
12:08:56		 Sala Sismica INGV-Roma 4304621
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2013-08-20 23:54:31 ± 0.08
Latitude 42.8425 ± 0.0027
Longitude 12.9827 ± 0.0074
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 4764761

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 577
Semi-minor axis of confidence ellipse (meter) 251
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 76
Circular confidence region, given by single value of horizontal uncertainty (meter) 580.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 171
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.09713
Epicentral distance of station farthest from the epicenter (degree) 0.29768
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitudes information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 4764761
Agency INGV
Autore Manually reviewed by Franco Mele
Time of creation (UTC) 2015-01-15 13:04:18

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 3
Type of magnitude ML
Reference to an origin 4304621
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2013-08-21 00:05:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2013-08-20T23:54:42.63 0.1 undecidable manual S 33 33.0447 50 0.17 93
IV.LNSS.HHZ. 2013-08-20T23:54:40.74 0.1 undecidable manual S 170 26.9508 50 -0.12 95
IV.FDMO.HHZ. 2013-08-20T23:54:39.53 0.1 undecidable manual S 22 23.1546 114 -0.24 93
IV.CESI.HHZ. 2013-08-20T23:54:38.50 0.1 undecidable manual S 341 19.0698 118 -0.01 98
IV.CSP1.EHZ. 2013-08-20T23:54:37.57 0.1 undecidable manual P 33 33.0447 50 -0.05 95
IV.LNSS.HHZ. 2013-08-20T23:54:36.67 0.1 undecidable manual P 170 26.9508 50 -0.02 97
IV.NRCA.HHZ. 2013-08-20T23:54:36.13 0.1 undecidable manual S 95 10.7781 133 -0.01 100
IV.FDMO.HHZ. 2013-08-20T23:54:36.01 0.1 undecidable manual P 22 23.1546 114 -0.06 97
IV.CESI.HHZ. 2013-08-20T23:54:35.50 0.1 undecidable manual P 341 19.0698 118 0.16 96
IV.NRCA.HHZ. 2013-08-20T23:54:34.18 0.1 undecidable manual P 95 10.7781 133 0.21 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHE. ML:0.5 0.000026749999999999996 0.1 AML other m 2013-08-20T23:54:38.78
IV.CESI.HHN. ML:0.7 0.0000376 1.44 AML other m 2013-08-20T23:54:38.78
IV.FSSB.HHE. ML:1.9 0.00009214999999999999 1.48 AML other m 2013-08-20T23:54:59.27
IV.LNSS.HHN. ML:0.9 0.000038849999999999996 1.58 AML other m 2013-08-20T23:54:41.22
IV.LNSS.HHE. ML:0.9 0.0000475 1.58 AML other m 2013-08-20T23:55:22.24
IV.NRCA.HHN. ML:1.1 0.00014950000000000003 0.12 AML other m 2013-08-20T23:54:36.24
IV.NRCA.HHE. ML:0.8 0.00007944999999999999 1.12 AML other m 2013-08-20T23:54:36.29
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