Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 21-04-2013 and time 10:26:06 (Italy) in region 2 km W Foligno (PG)

A magnitude ML 0.9 earthquake occured in region: 2 km W Foligno (PG), on

  • 21-04-2013 08:26:06 (UTC)
  • 21-04-2013 10:26:06 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9580, 12.6760 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
Foligno PG 2 57155 57155
Spello PG 4 8645 65800
Bevagna PG 6 5081 70881
Montefalco PG 7 5679 76560
Cannara PG 9 4305 80865
Trevi PG 11 8469 89334
Gualdo Cattaneo PG 11 6155 95489
Valtopina PG 13 1398 96887
Assisi PG 14 28299 125186
Castel Ritaldi PG 15 3278 128464
Giano dell'Umbria PG 16 3846 132310
Bastia Umbra PG 16 21874 154184
Bettona PG 17 4367 158551
Campello sul Clitunno PG 17 2442 160993
Nocera Umbra PG 20 5839 166832

Municipalities with at least 50000 inhabitants

An earthquake occurred to
2 Km W of Foligno (57155 inhabitants)
29 Km SE of Perugia (166134 inhabitants)
44 Km N of Terni (111501 inhabitants)
76 Km NE of Viterbo (67173 inhabitants)
86 Km SE of Arezzo (99543 inhabitants)
90 Km NW of L'Aquila (69753 inhabitants)
90 Km W of Teramo (54892 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 2013-04-21
08:26:06		 42.9575 12.6763 10 2015-01-20
11:25:02		 Bollettino Sismico Italiano INGV 3590751
Reviewed
Rev100 		ML 0.9 2013-04-21
08:26:06		 42.9572 12.6787 10 2014-10-21
12:08:56		 Sala Sismica INGV-Roma 3258391
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2013-04-21 08:26:06 ± 0.04
Latitude 42.9575 ± 0.0018
Longitude 12.6763 ± 0.0037
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 3590751

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 327
Semi-minor axis of confidence ellipse (meter) 217
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 271
Circular confidence region, given by single value of horizontal uncertainty (meter) 330.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 144
Number of associated phases, regardless of their use for origin computation 9
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.08633
Epicentral distance of station farthest from the epicenter (degree) 0.31027
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 0.2
Num. used stations 2
Type of magnitude ML
Reference to an origin 3258391
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2013-04-21 08:32:53

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 2
Type of magnitude ML
Reference to an origin 3590751
Agency INGV
Autore Manually reviewed by Franco Mele
Time of creation (UTC) 2015-01-15 13:24:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2013-04-21T08:26:18.12 0.1 undecidable manual S 75 34.4433 50 0.01 98
IV.ATCC.EHZ. 2013-04-21T08:26:15.70 0.1 undecidable manual S 353 25.4523 50 0 100
IV.FDMO.HHZ. 2013-04-21T08:26:13.03 0.1 undecidable manual P 75 34.4433 50 -0.07 97
IV.MOMA.HHZ. 2013-04-21T08:26:13.81 0.1 undecidable manual S 207 19.4694 118 -0.05 100
IV.ATCC.EHZ. 2013-04-21T08:26:11.70 0.1 undecidable manual P 353 25.4523 50 0 100
IV.MOMA.HHZ. 2013-04-21T08:26:10.70 0.3 undecidable manual P 207 19.4694 118 0.06 75
IV.CESI.HHZ. 2013-04-21T08:26:10.64 0.3 undecidable manual P 74 19.2696 118 0.03 75
IV.ASSB.HHZ. 2013-04-21T08:26:10.96 0.1 undecidable manual S 351 9.5793 137 -0.12 100
IV.ASSB.HHZ. 2013-04-21T08:26:09.21 0.1 undecidable manual P 351 9.5793 137 0.17 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ASSB.HHN. ML:1.1 0.0001555 0.06 AML other m 2013-04-21T08:26:11.56
IV.ASSB.HHE. ML:1.1 0.000178 0.14 AML other m 2013-04-21T08:26:11.60
IV.MOMA.HHN. ML:0.7 0.0000369 0.12 AML other m 2013-04-21T08:26:14.61
IV.MOMA.HHE. ML:0.8 0.00004425 1.38 AML other m 2013-04-21T08:26:14.13
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