Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 20-02-2013 and time 19:08:57 (Italy) in region 4 km E Alimena (PA)

A magnitude ML 2.0 earthquake occured in region: 4 km E Alimena (PA), on

  • 20-02-2013 18:08:57 (UTC)
  • 20-02-2013 19:08:57 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.7050, 14.1610 at 62 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
Alimena PA 4 2032 2032
Bompietro PA 7 1401 3433
Blufi PA 9 1029 4462
Gangi PA 11 6811 11273
Petralia Soprana PA 11 3360 14633
Resuttano CL 12 2038 16671
Petralia Sottana PA 13 2821 19492
Villarosa EN 13 4937 24429
Castellana Sicula PA 13 3411 27840
Calascibetta EN 16 4528 32368
Santa Caterina Villarmosa CL 17 5388 37756
Geraci Siculo PA 17 1945 39701
Sperlinga EN 18 805 40506
Enna EN 18 28019 68525
Polizzi Generosa PA 19 3407 71932

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km NE of Caltanissetta (63360 inhabitants)
67 Km NE of Agrigento (59770 inhabitants)
71 Km SE of Bagheria (55387 inhabitants)
71 Km N of Gela (75827 inhabitants)
84 Km SE of Palermo (674435 inhabitants)
85 Km W of Catania (314555 inhabitants)
89 Km W of Acireale (52622 inhabitants)
90 Km NW of Vittoria (63339 inhabitants)
100 Km NW of Ragusa (73313 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 2.0 2013-02-20
18:08:57		 37.7047 14.1608 62 2015-01-20
11:22:43		 Bollettino Sismico Italiano INGV 3635971
Reviewed
Rev100 		ML 2.1 2013-02-20
18:08:56		 37.6907 14.0987 67 2014-10-21
12:08:56		 Sala Sismica INGV-Roma 2982521
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2013-02-20 18:08:57 ± 0.23
Latitude 37.7047 ± 0.0144
Longitude 14.1608 ± 0.0182
Depth (km) 62 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 3635971

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1537
Semi-minor axis of confidence ellipse (meter) 1240
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 249
Circular confidence region, given by single value of horizontal uncertainty (meter) 1540.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 62
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.42
Epicentral distance of station closest to the epicenter (degree) 0.13400
Epicentral distance of station farthest from the epicenter (degree) 0.90742
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 19
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.2
Num. used stations 9
Type of magnitude ML
Reference to an origin 3635971
Agency INGV
Autore Manually reviewed by Franco Mele
Time of creation (UTC) 2015-01-15 13:24:33

ML:2.1

Field Value
Value 2.1
Uncertainty 0.2
Num. used stations 9
Type of magnitude ML
Reference to an origin 2982521
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2013-02-20 18:19:35
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HMDC.HHZ. 2013-02-20T18:09:27.00 0.6 undecidable manual S 146 99.2229 111 0.19 44
IV.HAGA.HHZ. 2013-02-20T18:09:26.20 0.6 undecidable manual S 118 99.123 111 -0.58 40
IV.HCRL.HHZ. 2013-02-20T18:09:24.70 0.3 undecidable manual S 121 89.8434 114 -0.24 66
IV.MCPD.HHZ. 2013-02-20T18:09:21.30 0.6 undecidable manual S 47 67.8765 123 0.52 42
IV.HLNI.HHZ. 2013-02-20T18:09:21.20 0.3 undecidable manual S 122 73.9704 120 -0.7 58
IV.MSFR.HHZ. 2013-02-20T18:09:19.20 0.6 undecidable manual S 46 52.503 132 1.05 36
IV.GALF.HHZ. 2013-02-20T18:09:16.70 0.6 undecidable manual S 89 35.6421 144 0.99 40
IV.GIB.HHZ. 2013-02-20T18:09:15.10 0.6 undecidable manual S 340 33.8439 146 -0.39 46
IV.HMDC.HHZ. 2013-02-20T18:09:14.25 0.1 undecidable manual P 146 99.2229 111 -0.03 91
IV.HAGA.HHZ. 2013-02-20T18:09:14.01 0.1 undecidable manual P 118 99.123 111 -0.25 87
IV.SSY.HHZ. 2013-02-20T18:09:14.31 0.1 undecidable manual P 127 100.7214 111 -0.14 89
IV.PETRA.HHZ. 2013-02-20T18:09:13.30 0.3 undecidable manual S 344 14.874 164 -0.45 68
IV.HCRL.HHZ. 2013-02-20T18:09:12.74 0.1 undecidable manual P 121 89.8434 114 -0.46 85
IV.HVZN.HHZ. 2013-02-20T18:09:11.63 0.1 undecidable manual P 140 76.1682 119 -0.04 94
IV.CLTA.HHE. 2013-02-20T18:09:11.36 0.1 undecidable manual P 196 63.0924 126 1.05 70
IV.HBSP.HHZ. 2013-02-20T18:09:11.26 0.1 undecidable manual P 155 70.374 122 0.2 92
IV.MUCR.HHZ. 2013-02-20T18:09:11.95 0.1 undecidable manual P 59 72.8715 121 0.63 79
IV.HLNI.HHZ. 2013-02-20T18:09:10.83 0.1 undecidable manual P 122 73.9704 120 -0.61 83
IV.MCPD.HHZ. 2013-02-20T18:09:10.73 0.1 undecidable manual P 47 67.8765 123 -0.06 96
IV.FAVR.HHE. 2013-02-20T18:09:10.41 0.6 undecidable manual P 222 65.1903 125 -0.1 47
IV.SOLUN.HHZ. 2013-02-20T18:09:10.58 0.1 undecidable manual P 308 69.7746 122 -0.41 89
IV.MSFR.HHZ. 2013-02-20T18:09:09.24 0.1 undecidable manual P 46 52.503 132 -0.04 99
IV.RAFF.HHZ. 2013-02-20T18:09:09.99 0.1 positive manual P 162 56.3991 130 0.35 92
IV.ALJA.HHE. 2013-02-20T18:09:08.46 0.3 undecidable manual P 278 36.0417 144 0.56 68
IV.CAGR.HHZ. 2013-02-20T18:09:08.32 0.1 undecidable manual P 107 31.1466 148 0.76 85
IV.GALF.HHZ. 2013-02-20T18:09:07.99 0.1 undecidable manual P 89 35.6421 144 0.12 100
IV.GIB.HHZ. 2013-02-20T18:09:07.52 0.1 undecidable manual P 340 33.8439 146 -0.22 98
IV.PETRA.HHZ. 2013-02-20T18:09:06.08 0.1 negative manual P 344 14.874 164 -0.66 88
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CAGR.HHE. ML:2.0 0.00016399999999999997 1.26 AML other m 2013-02-20T18:09:21.79
IV.CAGR.HHN. ML:1.9 0.0001315 0.6 AML other m 2013-02-20T18:09:24.37
IV.GALF.HHE. ML:1.7 0.0000852 0.32 AML other m 2013-02-20T18:09:18.41
IV.GALF.HHN. ML:1.8 0.00009389999999999999 0.38 AML other m 2013-02-20T18:09:18.91
IV.GIB.HHE. ML:2.3 0.00035499999999999996 0.86 AML other m 2013-02-20T18:09:16.38
IV.GIB.HHN. ML:2.1 0.00020150000000000002 0.4 AML other m 2013-02-20T18:09:16.67
IV.HLNI.HHN. ML:2.2 0.0001535 0.1 AML other m 2013-02-20T18:09:21.82
IV.HLNI.HHE. ML:2.2 0.0001615 0.64 AML other m 2013-02-20T18:09:21.57
IV.MCPD.HHE. ML:1.7 0.00005665 0.36 AML other m 2013-02-20T18:09:22.65
IV.MCPD.HHN. ML:1.8 0.0000667 1.14 AML other m 2013-02-20T18:09:24.14
IV.MUCR.HHN. ML:2.0 0.00009934999999999999 0.7 AML other m 2013-02-20T18:09:24.64
IV.MUCR.HHE. ML:1.9 0.00008295 0.7 AML other m 2013-02-20T18:09:25.11
IV.PETRA.HHE. ML:1.9 0.000148 0.44 AML other m 2013-02-20T18:09:13.63
IV.PETRA.HHN. ML:1.9 0.000144 1.46 AML other m 2013-02-20T18:09:17.60
IV.RAFF.HHE. ML:2.3 0.00025550000000000003 0.24 AML other m 2013-02-20T18:09:20.68
IV.RAFF.HHN. ML:2.2 0.0002245 0.5 AML other m 2013-02-20T18:09:21.10
IV.SSY.HHE. ML:2.2 0.0001275 1.54 AML other m 2013-02-20T18:09:18.99
IV.SSY.HHN. ML:2.5 0.000244 0.76 AML other m 2013-02-20T18:09:31.15
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
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Type Description Link
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QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download
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