Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 25-05-2018 and time 11:44:46 (Italy) in region 1 km SW Sant'Alfio (CT)

A magnitude ML 1.9 earthquake occured in region: 1 km SW Sant'Alfio (CT), on

  • 25-05-2018 09:44:46 (UTC)
  • 25-05-2018 11:44:46 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.7400, 15.1320 at 28 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
Sant'Alfio CT 1 1582 1582
Milo CT 2 1087 2669
Giarre CT 5 27659 30328
Zafferana Etnea CT 6 9517 39845
Santa Venerina CT 6 8592 48437
Mascali CT 6 14282 62719
Riposto CT 6 14838 77557
Piedimonte Etneo CT 9 3963 81520
Fiumefreddo di Sicilia CT 9 9623 91143
Linguaglossa CT 11 5403 96546
Calatabiano CT 13 5308 101854
Trecastagni CT 14 10910 112764
Acireale CT 14 52622 165386
Viagrande CT 15 8563 173949
Aci Sant'Antonio CT 15 17984 191933
Pedara CT 15 14102 206035
Aci Catena CT 15 29851 235886
Gaggi ME 16 3184 239070
Aci Bonaccorsi CT 16 3524 242594
Castiglione di Sicilia CT 16 3215 245809
Nicolosi CT 17 7463 253272
Giardini-Naxos ME 17 9415 262687
Valverde CT 18 7840 270527
Motta Camastra ME 18 845 271372
Francavilla di Sicilia ME 18 3945 275317
San Giovanni la Punta CT 18 23060 298377
Taormina ME 18 10960 309337
Castelmola ME 18 1088 310425
Tremestieri Etneo CT 19 20589 331014
Graniti ME 19 1492 332506
Moio Alcantara ME 19 717 333223
San Gregorio di Catania CT 19 11966 345189
Mascalucia CT 20 31958 377147

Municipalities with at least 50000 inhabitants

An earthquake occurred to
14 Km N of Acireale (52622 inhabitants)
27 Km N of Catania (314555 inhabitants)
61 Km SW of Reggio di Calabria (183035 inhabitants)
63 Km SW of Messina (238439 inhabitants)
77 Km N of Siracusa (122291 inhabitants)
97 Km NE of Ragusa (73313 inhabitants)
98 Km E of Caltanissetta (63360 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 1.9 2018-05-25
09:44:46		 37.7398 15.132 28 2019-04-24
14:50:49		 Bollettino Sismico Italiano INGV 59065811
Reviewed
Rev100 		ML 2.0 2018-05-25
09:44:45		 37.7453 15.1342 31 2018-05-25
10:04:41		 Sala Sismica INGV-Roma 57209951
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-05-25 09:44:46 ± 0.15
Latitude 37.7398 ± 0.0036
Longitude 15.1320 ± 0.0091
Depth (km) 28 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 59065811

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 770
Semi-minor axis of confidence ellipse (meter) 22
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 273
Circular confidence region, given by single value of horizontal uncertainty (meter) 770.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 124
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 23
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.08094
Epicentral distance of station farthest from the epicenter (degree) 0.67269
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 57209951
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-05-25 10:04:41

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 59065811
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2018-07-25 10:46:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MEU.SHZ. 2018-05-25T09:45:09.70 0.6 undecidable manual S 201 74.6697 105 0.19 47
IV.HAGA.HHZ. 2018-05-25T09:45:03.79 0.6 undecidable manual S 178 50.5161 113 0.39 47
IV.MPNC.HHN. 2018-05-25T09:45:03.38 0.6 undecidable manual S 23 49.1175 114 0.33 48
IV.MNO.SHZ. 2018-05-25T09:45:02.19 0.6 undecidable manual S 299 43.7229 116 0.43 47
IV.HLNI.HHE. 2018-05-25T09:45:02.80 0.6 undecidable manual S 208 49.0176 114 -0.24 49
IV.MUCR.HHZ. 2018-05-25T09:45:00.97 0.3 undecidable manual S 326 40.5261 119 -0.03 78
IV.MEU.SHZ. 2018-05-25T09:44:59.44 1.0 undecidable manual P 201 74.6697 105 -0.36 22
IV.IVPL.HHZ. 2018-05-25T09:44:59.83 0.6 undecidable manual P 349 71.8725 106 0.44 45
IV.NOV.HHZ. 2018-05-25T09:44:59.03 0.3 undecidable manual S 1 31.9458 126 -0.03 78
IV.EPZF.HHZ. 2018-05-25T09:44:58.07 0.3 undecidable manual S 291 25.8519 132 0.28 74
IV.SSY.HHZ. 2018-05-25T09:44:58.72 0.6 undecidable manual P 185 64.7907 107 0.38 46
IV.AIO.HHZ. 2018-05-25T09:44:57.72 0.3 undecidable manual S 19 27.1506 131 -0.33 74
IV.MPNC.HHN. 2018-05-25T09:44:56.22 0.1 undecidable manual P 23 49.1175 114 0.14 100
IV.HAGA.HHZ. 2018-05-25T09:44:56.26 0.6 undecidable manual P 178 50.5161 113 -0.01 50
IV.MNO.SHZ. 2018-05-25T09:44:55.62 0.1 undecidable manual P 299 43.7229 116 0.29 97
IV.HLNI.HHE. 2018-05-25T09:44:55.84 0.3 undecidable manual P 208 49.0176 114 -0.23 73
IV.EPOZ.HHZ. 2018-05-25T09:44:55.67 0.6 undecidable manual S 147 8.9799 160 0.44 50
IV.MUCR.HHZ. 2018-05-25T09:44:54.80 0.3 undecidable manual P 326 40.5261 119 -0.09 76
IV.NOV.HHZ. 2018-05-25T09:44:53.70 0.3 undecidable manual P 1 31.9458 126 -0.07 77
IV.AIO.HHZ. 2018-05-25T09:44:53.05 0.3 undecidable manual P 19 27.1506 131 -0.14 77
IV.EPZF.HHZ. 2018-05-25T09:44:52.61 0.1 undecidable manual P 291 25.8519 132 -0.43 97
IV.EPOZ.HHZ. 2018-05-25T09:44:51.70 0.3 undecidable manual P 147 8.9799 160 0.14 80
IV.EMSG.HHZ. 2018-05-25T09:44:51.57 0.1 undecidable manual P 299 18.3705 143 -0.69 90
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.EPZF.HHN. ML:0.0 0.0005511108 0.32 AML other m 2018-05-25T09:44:58.36
IV.EPZF.HHE. ML:0.0 0.00040998574999999996 0.2816 AML other m 2018-05-25T09:44:59.89
IV.EPOZ.HHE. ML:1.9 0.00039563325 0.3008 AML other m 2018-05-25T09:44:59.56
IV.EPOZ.HHN. ML:2.0 0.0005224582 0.2752 AML other m 2018-05-25T09:44:59.76
IV.AIO.HHN. ML:1.6 0.00016452060000000002 0.2624 AML other m 2018-05-25T09:45:00.60
IV.AIO.HHE. ML:1.8 0.00021413860000000002 0.4608 AML other m 2018-05-25T09:44:58.67
IV.NOV.HHN. ML:1.9 0.00024656099999999996 0.3776 AML other m 2018-05-25T09:45:00.49
IV.NOV.HHE. ML:2.1 0.0004564376 0.576 AML other m 2018-05-25T09:44:59.57
IV.MUCR.HHN. ML:1.6 0.00010388110000000001 0.4608 AML other m 2018-05-25T09:45:01.15
IV.MUCR.HHE. ML:1.8 0.00015599745 0.5184 AML other m 2018-05-25T09:45:01.24
IV.MNO.SHE. ML:0.0 0.0001664601 0.5568 AML other m 2018-05-25T09:45:03.64
IV.MNO.SHN. ML:0.0 0.00011080607500000001 0.64 AML other m 2018-05-25T09:45:06.35
IV.MEU.SHE. ML:0.0 0.000053573015000000005 0.1984 AML other m 2018-05-25T09:45:11.68
IV.MEU.SHN. ML:0.0 0.00007871190000000001 0.1984 AML other m 2018-05-25T09:45:12.10
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
Waveforms Seismic signals in miniseed + resp format Download