Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 04-08-2013 and time 02:19:26 (Italy) in region 4 km S Spoleto (PG)

A magnitude ML 0.9 earthquake occured in region: 4 km S Spoleto (PG), on

  • 04-08-2013 00:19:26 (UTC)
  • 04-08-2013 02:19:26 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6970, 12.7320 at 19 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
Scheggino PG 8 461 38679
Sant'Anatolia di Narco PG 10 564 39243
Ferentillo TR 10 1913 41156
Montefranco TR 11 1276 42432
Arrone TR 13 2763 45195
Vallo di Nera PG 14 364 45559
Campello sul Clitunno PG 14 2442 48001
Castel Ritaldi PG 15 3278 51279
Acquasparta TR 15 4778 56057
Polino TR 15 233 56290
Terni TR 17 111501 167791
Poggiodomo PG 17 117 167908
San Gemini TR 18 5018 172926
Monteleone di Spoleto PG 19 599 173525
Massa Martana PG 19 3770 177295
Labro RI 20 374 177669
Giano dell'Umbria PG 20 3846 181515

Municipalities with at least 50000 inhabitants

An earthquake occurred to
17 Km NE of Terni (111501 inhabitants)
29 Km S of Foligno (57155 inhabitants)
54 Km SE of Perugia (166134 inhabitants)
60 Km NE of Viterbo (67173 inhabitants)
67 Km NW of L'Aquila (69753 inhabitants)
77 Km N of Guidonia Montecelio (88673 inhabitants)
80 Km W of Teramo (54892 inhabitants)
82 Km N of Tivoli (56533 inhabitants)
92 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 		ML 0.9 2013-08-04
00:19:26		 42.6968 12.7315 19 2015-01-20
11:28:20		 Bollettino Sismico Italiano INGV 4830981
Reviewed
Rev100 		ML 0.9 2013-08-04
00:19:26		 42.7018 12.7327 18 2014-10-21
12:08:56		 Sala Sismica INGV-Roma 4198601
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2013-08-04 00:19:26 ± 0.1
Latitude 42.6968 ± 0.0027
Longitude 12.7315 ± 0.0049
Depth (km) 19 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 4830981

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 346
Semi-minor axis of confidence ellipse (meter) 278
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 245
Circular confidence region, given by single value of horizontal uncertainty (meter) 350.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 81
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.14
Epicentral distance of station closest to the epicenter (degree) 0.12051
Epicentral distance of station farthest from the epicenter (degree) 0.42808
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.4
Num. used stations 10
Type of magnitude ML
Reference to an origin 4198601
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2013-08-04 00:29:42

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 9
Type of magnitude ML
Reference to an origin 4830981
Agency INGV
Autore Manually reviewed by Franco Mele
Time of creation (UTC) 2015-01-15 13:05:34
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2013-08-04T00:19:42.05 0.1 undecidable manual S 37 47.5191 103 0.33 88
IV.CESI.HHZ. 2013-08-04T00:19:39.01 0.1 undecidable manual S 22 36.9297 108 0.01 96
IV.ASSB.HHZ. 2013-08-04T00:19:39.39 0.1 undecidable manual S 351 38.8278 106 -0.08 95
IV.NRCA.HHZ. 2013-08-04T00:19:38.15 0.1 undecidable manual S 64 34.6431 109 -0.27 92
IV.LNSS.HHZ. 2013-08-04T00:19:36.62 0.1 undecidable manual S 112 27.2505 115 0.03 98
IV.FDMO.HHZ. 2013-08-04T00:19:35.08 0.1 positive manual P 37 47.5191 103 -0.14 91
IV.MOMA.HHZ. 2013-08-04T00:19:34.40 0.1 undecidable manual S 311 17.5713 130 -0.01 99
IV.CESX.HHZ. 2013-08-04T00:19:33.87 0.1 undecidable manual S 230 15.3735 134 -0.09 98
IV.NRCA.HHZ. 2013-08-04T00:19:33.26 0.1 positive manual P 64 34.6431 109 -0.06 95
IV.CESI.HHZ. 2013-08-04T00:19:33.60 0.1 positive manual P 22 36.9297 108 -0.05 95
IV.ASSB.HHZ. 2013-08-04T00:19:33.99 0.6 undecidable manual P 351 38.8278 106 0.06 48
IV.ARRO.EHZ. 2013-08-04T00:19:33.59 0.1 undecidable manual S 168 13.3755 139 -0.01 100
IV.LNSS.HHZ. 2013-08-04T00:19:32.29 0.1 negative manual P 112 27.2505 115 0.03 98
IV.MOMA.HHZ. 2013-08-04T00:19:31.05 0.3 undecidable manual P 311 17.5713 130 0.05 74
IV.ARRO.EHZ. 2013-08-04T00:19:30.72 0.1 positive manual P 168 13.3755 139 0.19 97
IV.CESX.HHZ. 2013-08-04T00:19:30.80 0.1 positive manual P 230 15.3735 134 0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARRO.EHN. ML:1.0 0.0000673 0.22 AML other m 2013-08-04T00:19:33.84
IV.ARRO.EHE. ML:1.2 0.00010339999999999999 0.82 AML other m 2013-08-04T00:19:34.25
IV.ASSB.HHN. ML:0.8 0.00001935 1.02 AML other m 2013-08-04T00:19:40.22
IV.ASSB.HHE. ML:0.9 0.00002325 1.02 AML other m 2013-08-04T00:19:40.21
IV.CESI.HHE. ML:0.4 0.000007625 0.9 AML other m 2013-08-04T00:19:39.12
IV.CESI.HHN. ML:0.6 0.0000143 0.28 AML other m 2013-08-04T00:20:14.59
IV.CESX.HHE. ML:0.7 0.00003525 0.42 AML other m 2013-08-04T00:19:36.22
IV.CESX.HHN. ML:0.7 0.00003535 0.52 AML other m 2013-08-04T00:19:36.50
IV.FDMO.HHE. ML:0.8 0.0000165 0.14 AML other m 2013-08-04T00:19:42.27
IV.FDMO.HHN. ML:0.8 0.0000149 0.3 AML other m 2013-08-04T00:19:42.33
IV.LAV9.HHE. ML:2.6 0.0003525 0.48 AML other m 2013-08-04T00:19:40.71
IV.LAV9.HHN. ML:2.5 0.00028149999999999996 0.5 AML other m 2013-08-04T00:19:40.67
IV.LNSS.HHE. ML:0.9 0.0000355 1.18 AML other m 2013-08-04T00:19:37.33
IV.LNSS.HHN. ML:1.0 0.0000425 1.34 AML other m 2013-08-04T00:19:37.20
IV.MOMA.HHN. ML:0.8 0.00004245 0.88 AML other m 2013-08-04T00:19:34.56
IV.MOMA.HHE. ML:0.8 0.000035799999999999996 0.18 AML other m 2013-08-04T00:19:35.87
IV.NRCA.HHN. ML:1.1 0.0000426 1.54 AML other m 2013-08-04T00:19:38.37
IV.NRCA.HHE. ML:1.1 0.00004975 0.16 AML other m 2013-08-04T00:19:39.83
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