Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.2 on date 23-12-2017 and time 18:35:29 (Italy) in region 4 km NE Ragalna (CT)

A magnitude ML 2.2 earthquake occured in region: 4 km NE Ragalna (CT), on

  • 23-12-2017 17:35:29 (UTC)
  • 23-12-2017 18:35:29 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.6590, 14.9660 at 6 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
Ragalna CT 4 3924 3924
Nicolosi CT 7 7463 11387
Belpasso CT 8 28108 39495
Santa Maria di Licodia CT 8 7641 47136
Biancavilla CT 9 24007 71143
Pedara CT 10 14102 85245
Paternò CT 11 48228 133473
Camporotondo Etneo CT 11 5023 138496
San Pietro Clarenza CT 11 7743 146239
Trecastagni CT 11 10910 157149
Adrano CT 12 36122 193271
Mascalucia CT 12 31958 225229
Viagrande CT 13 8563 233792
Zafferana Etnea CT 13 9517 243309
Tremestieri Etneo CT 13 20589 263898
Gravina di Catania CT 14 25838 289736
Aci Bonaccorsi CT 14 3524 293260
San Giovanni la Punta CT 15 23060 316320
Sant'Agata li Battiati CT 15 9479 325799
Milo CT 15 1087 326886
Aci Sant'Antonio CT 15 17984 344870
Santa Venerina CT 16 8592 353462
Misterbianco CT 16 49410 402872
Motta Sant'Anastasia CT 16 12116 414988
San Gregorio di Catania CT 16 11966 426954
Valverde CT 17 7840 434794
Aci Catena CT 17 29851 464645
Acireale CT 18 52622 517267
Sant'Alfio CT 18 1582 518849
Bronte CT 19 19172 538021
Aci Castello CT 20 18723 556744

Municipalities with at least 50000 inhabitants

An earthquake occurred to
18 Km W of Acireale (52622 inhabitants)
20 Km NW of Catania (314555 inhabitants)
73 Km NW of Siracusa (122291 inhabitants)
78 Km SW of Reggio di Calabria (183035 inhabitants)
79 Km SW of Messina (238439 inhabitants)
82 Km E of Caltanissetta (63360 inhabitants)
84 Km N of Ragusa (73313 inhabitants)
88 Km NE of Vittoria (63339 inhabitants)
91 Km N of Modica (54633 inhabitants)
91 Km NE of Gela (75827 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 2.2 2017-12-23
17:35:29		 37.6593 14.9657 6 2018-09-04
09:10:44		 Bollettino Sismico Italiano INGV 57395591
Reviewed
Rev100 		ML 2.2 2017-12-23
17:35:29		 37.6562 14.9653 6 2017-12-23
17:52:45		 Sala Sismica INGV-Roma 52761601
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2017-12-23 17:35:29 ± 0.11
Latitude 37.6593 ± 0.0054
Longitude 14.9657 ± 0.0091
Depth (km) 6 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 57395591

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 684
Semi-minor axis of confidence ellipse (meter) 629
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 65
Circular confidence region, given by single value of horizontal uncertainty (meter) 680.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 67
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) 0.45
Epicentral distance of station closest to the epicenter (degree) 0.03507
Epicentral distance of station farthest from the epicenter (degree) 0.50902
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:2.2

Field Value
Value 2.2
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 57395591
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2018-05-31 09:01:35

ML:2.2

Field Value
Value 2.2
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 52761601
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2017-12-23 17:52:45
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SSY.HHZ. 2017-12-23T17:35:48.57 0.3 undecidable manual S 170 56.499 50 0.7 58
IV.AGST.EHE. 2017-12-23T17:35:46.19 0.6 undecidable manual S 153 50.3163 50 -0.02 48
IV.MUCR.HHZ. 2017-12-23T17:35:44.55 0.3 undecidable manual S 349 43.3233 98 0.19 69
IV.HAGA.HHZ. 2017-12-23T17:35:44.98 0.3 undecidable manual S 158 44.7219 50 0.24 68
IV.HLNI.HHZ. 2017-12-23T17:35:42.04 0.3 undecidable manual S 193 35.4423 99 0.38 68
IV.GALF.HHZ. 2017-12-23T17:35:42.38 0.3 undecidable manual S 279 35.5422 99 0.71 61
IV.SSY.HHZ. 2017-12-23T17:35:39.37 0.1 undecidable manual P 170 56.499 50 -0.6 82
IV.AGST.EHE. 2017-12-23T17:35:39.57 0.1 undecidable manual P 153 50.3163 50 0.55 84
IV.HAGA.HHZ. 2017-12-23T17:35:37.43 0.1 undecidable manual P 158 44.7219 50 -0.74 79
IV.MUCR.HHZ. 2017-12-23T17:35:37.93 0.1 undecidable manual P 349 43.3233 98 -0.02 96
IV.NOV.HHZ. 2017-12-23T17:35:37.47 0.1 undecidable manual P 20 43.5231 50 -0.51 87
IV.AIO.HHZ. 2017-12-23T17:35:37.44 0.1 undecidable manual P 34 41.8248 98 -0.2 93
IV.GALF.HHZ. 2017-12-23T17:35:36.95 0.1 undecidable manual P 279 35.5422 99 0.55 86
IV.EPOZ.HHZ. 2017-12-23T17:35:36.95 0.3 undecidable manual S 86 19.6692 107 0.65 64
IV.HLNI.HHZ. 2017-12-23T17:35:35.44 0.1 undecidable manual P 193 35.4423 99 -0.94 73
IV.EMSG.HHZ. 2017-12-23T17:35:35.48 0.3 undecidable manual S 356 17.9709 108 -0.27 71
IV.EPOZ.HHZ. 2017-12-23T17:35:33.61 0.1 undecidable manual P 86 19.6692 107 0.32 94
IV.EMSG.HHZ. 2017-12-23T17:35:33.28 0.1 undecidable manual P 356 17.9709 108 0.31 95
IV.EPZF.HHZ. 2017-12-23T17:35:33.47 0.1 undecidable manual P 332 20.5683 106 -0.01 100
IV.ESML.HHZ. 2017-12-23T17:35:33.01 0.6 undecidable manual S 239 8.88 124 0.14 50
IV.ESLN.HHZ. 2017-12-23T17:35:31.85 0.3 undecidable manual S 12 3.8961 147 0.22 74
IV.ESML.HHZ. 2017-12-23T17:35:30.68 0.1 negative manual P 239 8.88 124 -0.64 87
IV.ESLN.HHZ. 2017-12-23T17:35:30.17 0.1 negative manual P 12 3.8961 147 -0.43 94
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ESML.HHE. ML:2.4 0.004889056 0.22 AML other m 2017-12-23T17:35:35.19
IV.ESML.HHN. ML:2.4 0.005017283 0.26 AML other m 2017-12-23T17:35:36.36
IV.EPOZ.HHE. ML:1.9 0.000697 1.56 AML other m 2017-12-23T17:35:40.94
IV.EMSG.HHN. ML:2.4 0.0024535855 0.38 AML other m 2017-12-23T17:35:40.40
IV.EPOZ.HHN. ML:2.0 0.000798 0.74 AML other m 2017-12-23T17:35:40.64
IV.EMSG.HHE. ML:2.6 0.0034422625 0.3 AML other m 2017-12-23T17:35:41.76
IV.HLNI.HHN. ML:1.5 0.00013971792500000002 0.38 AML other m 2017-12-23T17:35:43.78
IV.HLNI.HHE. ML:1.6 0.00015411455 1.5 AML other m 2017-12-23T17:35:45.81
IV.SSY.HHE. ML:2.0 0.00025412345 0.68 AML other m 2017-12-23T17:35:48.87
IV.SSY.HHN. ML:2.2 0.0003835497 1.1 AML other m 2017-12-23T17:35:48.10
IV.GALF.HHE. ML:2.1 0.00049930625 0.46 AML other m 2017-12-23T17:35:49.48
IV.GALF.HHN. ML:2.2 0.0007269286500000001 0.48 AML other m 2017-12-23T17:35:51.62
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