Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.1 on date 15-12-2017 and time 01:58:44 (Italy) in region Costa Ragusana (Ragusa)

A magnitude ML 2.1 earthquake occured in region: Costa Ragusana (Ragusa), on

  • 15-12-2017 00:58:44 (UTC)
  • 15-12-2017 01:58:44 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 36.5230, 14.6060 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

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km SW of Modica (54633 inhabitants)
46 Km S of Ragusa (73313 inhabitants)
48 Km S of Vittoria (63339 inhabitants)
68 Km SE of Gela (75827 inhabitants)
86 Km SW of Siracusa (122291 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 2.1 2017-12-15
00:58:44		 36.523 14.6063 6 2018-09-04
09:10:44		 Bollettino Sismico Italiano INGV 56984421
Reviewed
Rev100 		ML 2.3 2017-12-15
00:58:42		 36.4205 14.5427 10 2017-12-15
01:18:52		 Sala Sismica INGV-Roma 52597421
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2017-12-15 00:58:44 ± 0.31
Latitude 36.5230 ± 0.0162
Longitude 14.6063 ± 0.0224
Depth (km) 6 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 56984421

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2130
Semi-minor axis of confidence ellipse (meter) 1560
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 304
Circular confidence region, given by single value of horizontal uncertainty (meter) 2130.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 158
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.44
Epicentral distance of station closest to the epicenter (degree) 0.39210
Epicentral distance of station farthest from the epicenter (degree) 0.88493
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 56984421
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2018-05-18 14:42:33

ML:2.3

Field Value
Value 2.3
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 52597421
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2017-12-15 01:18:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HAGA.HHZ. 2017-12-15T00:59:15.07 1.0 undecidable manual S 30 97.5246 50 1.33 19
IV.HLNI.HHZ. 2017-12-15T00:59:13.62 0.3 undecidable manual S 14 94.5387 50 0.68 79
IV.RAFF.HHZ. 2017-12-15T00:59:12.28 0.6 undecidable manual S 344 80.5638 50 3.07 3
IV.SSY.HHZ. 2017-12-15T00:59:10.75 0.6 undecidable manual S 30 81.7515 50 1.23 42
IV.HMDC.HHZ. 2017-12-15T00:59:01.12 0.6 undecidable manual S 18 50.8158 50 -0.16 66
IV.HAGA.HHZ. 2017-12-15T00:59:01.16 0.3 undecidable manual P 30 97.5246 50 -0.04 93
IV.AGST.EHE. 2017-12-15T00:59:01.31 0.3 undecidable manual P 34 98.2239 50 0 93
IV.HLNI.HHZ. 2017-12-15T00:59:00.27 0.3 undecidable manual P 14 94.5387 50 -0.47 85
IV.HPAC.HHZ. 2017-12-15T00:58:59.46 0.3 undecidable manual S 62 43.5231 98 0.16 100
MN.WDD.HHE. 2017-12-15T00:58:58.58 0.3 undecidable manual P 186 76.4679 50 0.64 83
IV.SSY.HHZ. 2017-12-15T00:58:58.32 0.3 negative manual P 30 81.7515 50 -0.44 88
IV.RAFF.HHZ. 2017-12-15T00:58:58.49 0.6 undecidable manual P 344 80.5638 50 -0.09 63
IV.HMDC.HHZ. 2017-12-15T00:58:53.29 0.3 undecidable manual P 18 50.8158 50 -0.71 84
IV.HPAC.HHZ. 2017-12-15T00:58:52.30 0.3 negative manual P 62 43.5231 98 -0.56 91
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HPAC.HHE. ML:2.3 0.0006364303499999999 0.22 AML other m 2017-12-15T00:58:59.89
IV.HPAC.HHN. ML:2.3 0.0006470256 0.34 AML other m 2017-12-15T00:59:00.27
IV.HMDC.HHN. ML:2.0 0.00026464075 0.22 AML other m 2017-12-15T00:59:01.43
IV.HMDC.HHE. ML:2.0 0.00023910530000000003 4.98 AML other m 2017-12-15T00:59:03.65
IV.SSY.HHN. ML:2.3 0.00028268280000000003 0.22 AML other m 2017-12-15T00:59:16.57
IV.SSY.HHE. ML:2.1 0.00017760385000000002 0.34 AML other m 2017-12-15T00:59:12.00
IV.HLNI.HHN. ML:2.0 0.00009789243000000001 0.24 AML other m 2017-12-15T00:59:16.76
IV.HLNI.HHE. ML:2.0 0.0001216805 0.24 AML other m 2017-12-15T00:59:15.58
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