Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 17-02-2021 and time 06:13:35 (Italy) in region 6 km E Ragusa (RG)

A magnitude ML 1.9 earthquake occured in region: 6 km E Ragusa (RG), on

  • 17-02-2021 05:13:35 (UTC)
  • 17-02-2021 06:13:35 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 36.9310, 14.8040 at 21 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
Ragusa RG 7 73313 73313
Modica RG 9 54633 127946
Giarratana RG 13 3048 130994
Chiaramonte Gulfi RG 15 8238 139232
Palazzolo Acreide SR 17 8808 148040
Scicli RG 18 27077 175117
Comiso RG 18 30156 205273
Monterosso Almo RG 18 3032 208305
Rosolini SR 18 21427 229732
Ispica RG 18 16061 245793
Buscemi SR 19 1051 246844

Municipalities with at least 50000 inhabitants

An earthquake occurred to
7 Km E of Ragusa (73313 inhabitants)
9 Km NE of Modica (54633 inhabitants)
24 Km E of Vittoria (63339 inhabitants)
46 Km W of Siracusa (122291 inhabitants)
51 Km E of Gela (75827 inhabitants)
69 Km SW of Catania (314555 inhabitants)
82 Km SW of Acireale (52622 inhabitants)
91 Km SE 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 2021-02-17
05:13:35		 36.9312 14.8037 21 2021-07-12
16:54:59		 Bollettino Sismico Italiano INGV 87375941
Reviewed
Rev100 		ML 1.9 2021-02-17
05:13:35		 36.9342 14.8015 21 2021-02-17
05:22:56		 Sala Sismica INGV-Roma 87230511
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-17 05:13:35 ± 0.08
Latitude 36.9312 ± 0.0036
Longitude 14.8037 ± 0.0034
Depth (km) 21 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 87375941

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 397
Semi-minor axis of confidence ellipse (meter) 146
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 342
Circular confidence region, given by single value of horizontal uncertainty (meter) 400.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 93
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) 0.14
Epicentral distance of station closest to the epicenter (degree) 0.03238
Epicentral distance of station farthest from the epicenter (degree) 0.45686
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:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 87230511
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-17 05:22:56

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 87375941
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-09 08:54:37
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HAGA.HHZ. 2021-02-17T05:13:51.63 0.3 undecidable manual S 38 50.1165 105 -0.01 69
IV.HLNI.HHZ. 2021-02-17T05:13:50.75 0.3 undecidable manual S 7 46.7199 106 -0.02 69
IV.HCRL.HHZ. 2021-02-17T05:13:49.92 0.3 undecidable manual S 27 44.0226 108 -0.16 68
IV.HSRS.HNN. 2021-02-17T05:13:49.38 0.3 undecidable manual S 64 41.1255 109 0.01 70
IV.SSY.HHZ. 2021-02-17T05:13:47.98 0.3 undecidable manual S 44 34.6431 113 0.22 68
IV.HVZN.HHZ. 2021-02-17T05:13:46.50 0.6 undecidable manual S 344 28.4493 119 0.22 46
IV.HAVL.HHZ. 2021-02-17T05:13:46.10 0.3 undecidable manual S 84 28.4493 119 -0.15 70
IV.RAFF.HHZ. 2021-02-17T05:13:45.36 0.3 undecidable manual P 310 50.7159 105 0.47 63
IV.CROCE.HHZ. 2021-02-17T05:13:45.80 0.3 undecidable manual S 245 26.2515 122 0.04 72
IV.HLNI.HHZ. 2021-02-17T05:13:44.12 0.1 undecidable manual P 7 46.7199 106 -0.18 89
IV.ISPIC.EHZ. 2021-02-17T05:13:44.40 0.6 undecidable manual S 152 18.9699 132 0.21 46
IV.HAGA.HHZ. 2021-02-17T05:13:44.64 0.6 undecidable manual P 38 50.1165 105 -0.16 44
IV.HSRS.HNN. 2021-02-17T05:13:43.44 0.6 undecidable manual P 64 41.1255 109 -0.05 46
IT.LNT.HGZ. 2021-02-17T05:13:43.86 0.3 undecidable manual P 24 43.3233 108 0.05 70
IV.HCRL.HHZ. 2021-02-17T05:13:43.94 0.3 undecidable manual P 27 44.0226 108 0.04 70
IV.HMDC.HHZ. 2021-02-17T05:13:42.04 0.1 undecidable manual S 329 3.5964 169 -0.08 100
IV.SSY.HHZ. 2021-02-17T05:13:42.67 0.3 undecidable manual P 44 34.6431 113 0.11 70
IV.HVZN.HHZ. 2021-02-17T05:13:41.64 0.1 undecidable manual P 344 28.4493 119 -0.06 94
IV.HAVL.HHZ. 2021-02-17T05:13:41.71 0.1 undecidable manual P 84 28.4493 119 0.02 96
IV.ACATE.HNZ. 2021-02-17T05:13:41.45 0.6 undecidable manual P 291 28.749 119 -0.29 45
IV.CROCE.HHZ. 2021-02-17T05:13:41.34 0.1 undecidable manual P 245 26.2515 122 -0.07 94
IV.ISPIC.EHZ. 2021-02-17T05:13:40.75 1.0 undecidable manual P 152 18.9699 132 0.25 23
IV.HMDC.HHZ. 2021-02-17T05:13:39.26 0.1 undecidable manual P 329 3.5964 169 -0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HMDC.HHN. ML:1.6 0.00029700000000000006 0.18 AML other m 2021-02-17T05:13:42.27
IV.HMDC.HHE. ML:1.7 0.00041500000000000006 0.26 AML other m 2021-02-17T05:13:42.28
IV.HAVL.HHE. ML:1.9 0.000317 0.4 AML other m 2021-02-17T05:13:46.97
IV.HAVL.HHN. ML:1.7 0.00022799999999999999 0.96 AML other m 2021-02-17T05:13:47.97
IV.SSY.HHE. ML:2.3 0.0007289999999999999 0.78 AML other m 2021-02-17T05:13:48.53
IV.SSY.HHN. ML:2.4 0.0008810000000000001 0.98 AML other m 2021-02-17T05:13:49.69
IV.HCRL.HHE. ML:2.1 0.00035999999999999997 0.14 AML other m 2021-02-17T05:13:50.67
IV.HLNI.HHN. ML:1.6 0.00010839999999999999 1.28 AML other m 2021-02-17T05:13:51.20
IV.HLNI.HHE. ML:1.7 0.000126 1.12 AML other m 2021-02-17T05:13:52.76
IV.HCRL.HHN. ML:1.9 0.000212 0.2 AML other m 2021-02-17T05:13:52.26
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