Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.3 on date 31-12-2017 and time 08:44:23 (Italy) in region 8 km W Mazzarrone (CT)

A magnitude ML 2.3 earthquake occured in region: 8 km W Mazzarrone (CT), on

  • 31-12-2017 07:44:23 (UTC)
  • 31-12-2017 08:44:23 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.1040, 14.4700 at 27 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
Mazzarrone CT 9 4078 4078
Acate RG 9 10954 15032
Niscemi CL 9 27558 42590
Caltagirone CT 16 38686 81276
Vittoria RG 18 63339 144615
Grammichele CT 19 13418 158033
Gela CL 20 75827 233860
San Michele di Ganzaria CT 20 3245 237105

Municipalities with at least 50000 inhabitants

An earthquake occurred to
18 Km NW of Vittoria (63339 inhabitants)
20 Km E of Gela (75827 inhabitants)
31 Km NW of Ragusa (73313 inhabitants)
38 Km NW of Modica (54633 inhabitants)
56 Km SE of Caltanissetta (63360 inhabitants)
70 Km SW of Catania (314555 inhabitants)
73 Km W of Siracusa (122291 inhabitants)
82 Km E of Agrigento (59770 inhabitants)
84 Km SW of Acireale (52622 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 2.3 2017-12-31
07:44:23		 37.1043 14.47 27 2018-09-04
09:10:41		 Bollettino Sismico Italiano INGV 54082611
Reviewed
Rev100 		ML 2.3 2017-12-31
07:44:23		 37.1332 14.416 26 2017-12-31
08:00:36		 Sala Sismica INGV-Roma 52930241
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2017-12-31 07:44:23 ± 0.13
Latitude 37.1043 ± 0.0081
Longitude 14.4700 ± 0.0090
Depth (km) 27 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 54082611

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 854
Semi-minor axis of confidence ellipse (meter) 442
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 5
Circular confidence region, given by single value of horizontal uncertainty (meter) 850.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 165
Number of associated phases, regardless of their use for origin computation 36
Number of defining phases 36
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.33
Epicentral distance of station closest to the epicenter (degree) 0.14569
Epicentral distance of station farthest from the epicenter (degree) 2.05495
Number of stations at which the event was observed 27
Number of stations from which data was used for origin computation 27
Magnitudes information

ML:2.3

Field Value
Value 2.3
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 52930241
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2017-12-31 08:00:36

ML:2.3

Field Value
Value 2.3
Uncertainty 0.4
Num. used stations 18
Type of magnitude ML
Reference to an origin 54082611
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2018-07-26 11:04:19
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PLAC.HHE. 2017-12-31T07:44:57.49 0.6 undecidable manual P 49 228.105 54 -0.05 27
IV.MUCR.HHZ. 2017-12-31T07:44:57.11 0.6 undecidable manual S 19 110.0121 99 0.98 34
MN.CEL.HNZ. 2017-12-31T07:44:52.14 0.6 undecidable manual P 44 179.0874 54 0.71 30
IV.MPG.SHE. 2017-12-31T07:44:48.15 0.6 undecidable manual P 321 152.5362 54 0.02 41
IV.MMGO.HHN. 2017-12-31T07:44:47.50 0.6 undecidable manual P 296 145.4433 54 0.26 40
IV.ESLN.HHZ. 2017-12-31T07:44:47.62 1.0 undecidable manual S 34 79.0653 103 -0.39 22
IV.MTTG.HHE. 2017-12-31T07:44:47.40 1.0 undecidable manual P 47 147.1416 54 -0.05 21
IV.SOLUN.HHE. 2017-12-31T07:44:46.18 0.6 undecidable manual P 323 137.0628 54 -0.02 43
IV.AGST.EHN. 2017-12-31T07:44:45.47 0.6 undecidable manual S 76 68.9754 106 0.05 49
IV.HPAC.HHZ. 2017-12-31T07:44:45.62 0.6 undecidable manual S 131 66.7776 106 0.77 40
IV.CORL.HHZ. 2017-12-31T07:44:45.61 0.6 undecidable manual P 311 134.9649 54 -0.33 41
IV.HAGA.HHZ. 2017-12-31T07:44:44.15 0.3 undecidable manual S 71 63.7917 107 0.07 74
IV.AIO.HHE. 2017-12-31T07:44:43.15 0.6 undecidable manual P 35 117.2937 99 -0.49 40
IV.NOV.HHZ. 2017-12-31T07:44:43.24 0.6 undecidable manual P 30 117.993 99 -0.51 40
IV.MUCR.HHZ. 2017-12-31T07:44:42.67 0.1 undecidable manual P 19 110.0121 99 0.14 89
IV.SSY.HHZ. 2017-12-31T07:44:42.40 0.6 undecidable manual S 83 53.7018 111 0.86 40
IV.GIB.HHE. 2017-12-31T07:44:42.01 0.3 undecidable manual P 338 105.7164 100 0.13 67
IV.PLLN.EHN. 2017-12-31T07:44:41.36 0.6 undecidable manual P 344 102.6195 100 -0.05 46
IV.MSFR.HHZ. 2017-12-31T07:44:41.51 0.3 undecidable manual P 6 103.7184 100 -0.06 69
IV.CSLB.HHZ. 2017-12-31T07:44:40.48 0.6 undecidable manual P 339 99.3228 100 -0.42 43
IV.ALJA.HHZ. 2017-12-31T07:44:40.70 0.6 undecidable manual P 319 95.3379 101 0.39 43
IV.EMSG.HHN. 2017-12-31T07:44:40.32 1.0 undecidable manual P 28 90.0432 102 0.82 19
IV.EPOZ.HHZ. 2017-12-31T07:44:39.84 0.1 undecidable manual P 45 89.3439 102 0.45 87
IV.EPZF.HHZ. 2017-12-31T07:44:39.89 0.3 undecidable manual P 23 86.8464 102 0.88 56
IV.PETRA.HHN. 2017-12-31T07:44:39.25 0.3 undecidable manual P 339 86.7465 102 0.25 68
IV.HLNI.HHZ. 2017-12-31T07:44:38.77 0.3 undecidable manual S 53 44.622 115 -0.54 68
IV.ESLN.HHZ. 2017-12-31T07:44:38.27 1.0 undecidable manual P 34 79.0653 103 0.42 22
IV.HMDC.HHZ. 2017-12-31T07:44:36.64 0.3 undecidable manual S 120 32.0457 125 0.26 75
IV.AGST.EHN. 2017-12-31T07:44:35.80 0.3 undecidable manual P 76 68.9754 106 -0.55 65
IV.HPAC.HHZ. 2017-12-31T07:44:35.99 0.3 undecidable manual P 131 66.7776 106 -0.03 74
IV.HAGA.HHZ. 2017-12-31T07:44:35.02 0.1 undecidable manual P 71 63.7917 107 -0.56 88
IV.RAFF.HHZ. 2017-12-31T07:44:33.74 0.3 undecidable manual S 324 16.1727 146 0.39 75
IV.SSY.HHZ. 2017-12-31T07:44:33.94 0.3 undecidable manual P 83 53.7018 111 -0.17 74
IV.HLNI.HHZ. 2017-12-31T07:44:32.20 0.1 undecidable manual P 53 44.622 115 -0.62 89
IV.HMDC.HHZ. 2017-12-31T07:44:30.83 0.1 undecidable manual P 120 32.0457 125 -0.3 100
IV.RAFF.HHZ. 2017-12-31T07:44:28.87 0.1 undecidable manual P 324 16.1727 146 -0.51 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RAFF.HHE. ML:2.3 0.0010500979500000002 0.1792 AML other m 2017-12-31T07:44:34.04
IV.RAFF.HHN. ML:2.0 0.00044365545 0.1408 AML other m 2017-12-31T07:44:34.62
IV.HMDC.HHN. ML:2.8 0.002246665 0.1792 AML other m 2017-12-31T07:44:36.88
IV.HMDC.HHE. ML:2.8 0.0022552645 0.2432 AML other m 2017-12-31T07:44:36.90
IV.HLNI.HHN. ML:2.0 0.00022469555 0.256 AML other m 2017-12-31T07:44:39.14
IV.HLNI.HHE. ML:2.0 0.00022506805 0.256 AML other m 2017-12-31T07:44:39.11
IV.SSY.HHN. ML:2.5 0.00064056645 0.2048 AML other m 2017-12-31T07:44:43.94
IV.HAGA.HHE. ML:1.9 0.000140619 0.1984 AML other m 2017-12-31T07:44:45.24
IV.SSY.HHE. ML:2.1 0.00028408449999999994 0.1792 AML other m 2017-12-31T07:44:45.63
IV.HAGA.HHN. ML:1.9 0.000138904 0.1024 AML other m 2017-12-31T07:44:45.62
IV.HPAC.HHN. ML:2.8 0.00096374475 0.2176 AML other m 2017-12-31T07:44:46.03
IV.HPAC.HHE. ML:2.7 0.0009306643999999999 0.3008 AML other m 2017-12-31T07:44:46.81
IV.EPOZ.HHN. ML:2.7 0.000547912 0.2368 AML other m 2017-12-31T07:44:54.09
IV.EPOZ.HHE. ML:2.5 0.00037823815 0.4992 AML other m 2017-12-31T07:44:53.98
IV.MUCR.HHE. ML:2.5 0.00025535455000000003 0.4032 AML other m 2017-12-31T07:44:57.56
IV.MUCR.HHN. ML:2.3 0.00014957255 0.3584 AML other m 2017-12-31T07:44:57.91
IV.CSLB.HHE. ML:1.8 0.000053132835 0.6592 AML other m 2017-12-31T07:44:59.42
IV.CSLB.HHN. ML:1.8 0.000058726429999999996 0.4608 AML other m 2017-12-31T07:45:00.28
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
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Type Description Link
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