Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 17-02-2021 and time 07:14:45 (Italy) in region 7 km E Ragusa (RG)

A magnitude ML 1.7 earthquake occured in region: 7 km E Ragusa (RG), on

  • 17-02-2021 06:14:45 (UTC)
  • 17-02-2021 07:14:45 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 36.9260, 14.8070 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 8 54633 127946
Giarratana RG 14 3048 130994
Chiaramonte Gulfi RG 15 8238 139232
Scicli RG 17 27077 166309
Rosolini SR 18 21427 187736
Palazzolo Acreide SR 18 8808 196544
Ispica RG 18 16061 212605
Comiso RG 18 30156 242761
Monterosso Almo RG 19 3032 245793
Buscemi SR 19 1051 246844

Municipalities with at least 50000 inhabitants

An earthquake occurred to
7 Km E of Ragusa (73313 inhabitants)
8 Km NE of Modica (54633 inhabitants)
24 Km E of Vittoria (63339 inhabitants)
46 Km W of Siracusa (122291 inhabitants)
52 Km E of Gela (75827 inhabitants)
69 Km SW of Catania (314555 inhabitants)
83 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 1.7 2021-02-17
06:14:45		 36.9258 14.8068 21 2021-07-12
16:54:59		 Bollettino Sismico Italiano INGV 87380751
Reviewed
Rev100 		ML 1.7 2021-02-17
06:14:45		 36.9143 14.7913 23 2021-02-17
06:23:35		 Sala Sismica INGV-Roma 87232041
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-17 06:14:45 ± 0.12
Latitude 36.9258 ± 0.0063
Longitude 14.8068 ± 0.0067
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 87380751

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 721
Semi-minor axis of confidence ellipse (meter) 307
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 314
Circular confidence region, given by single value of horizontal uncertainty (meter) 720.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 95
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.03777
Epicentral distance of station farthest from the epicenter (degree) 0.46225
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 19
Type of magnitude ML
Reference to an origin 87380751
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-09 13:08:16

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 19
Type of magnitude ML
Reference to an origin 87232041
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-17 06:23:35
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HAGA.HHZ. 2021-02-17T06:15:02.13 0.3 undecidable manual S 38 50.3163 105 -0.09 71
IV.HLNI.HHZ. 2021-02-17T06:15:01.45 0.6 undecidable manual S 7 47.2194 106 0.03 47
IV.HCRL.HHZ. 2021-02-17T06:15:00.94 0.6 undecidable manual S 27 44.4222 108 0.25 45
IV.HSRS.HNZ. 2021-02-17T06:14:59.83 0.6 undecidable manual S 63 41.1255 109 -0.05 48
IV.SSY.HHZ. 2021-02-17T06:14:58.70 0.3 undecidable manual S 42 34.9428 113 0.37 68
IV.HVZN.HHZ. 2021-02-17T06:14:56.84 0.3 undecidable manual S 344 29.1486 119 -0.1 74
IV.HAVL.HHZ. 2021-02-17T06:14:56.72 0.6 undecidable manual S 82 28.1496 120 0 49
IV.CROCE.HHZ. 2021-02-17T06:14:56.21 0.6 undecidable manual S 247 26.2515 122 -0.07 49
IV.RAFF.HHZ. 2021-02-17T06:14:56.27 0.3 undecidable manual P 310 51.3153 105 0.78 57
IV.HAGA.HHZ. 2021-02-17T06:14:54.97 0.3 undecidable manual P 38 50.3163 105 -0.38 66
IV.ISPIC.HNZ. 2021-02-17T06:14:54.89 0.6 undecidable manual S 152 18.2706 134 0.31 49
IV.HCRL.HHZ. 2021-02-17T06:14:54.40 0.1 undecidable manual P 27 44.4222 108 -0.06 96
IV.HLNI.HHZ. 2021-02-17T06:14:54.54 0.3 undecidable manual P 7 47.2194 106 -0.35 68
IV.HSRS.HNZ. 2021-02-17T06:14:53.95 0.6 undecidable manual P 63 41.1255 109 -0.05 48
IV.SSY.HHZ. 2021-02-17T06:14:53.19 0.1 undecidable manual P 42 34.9428 113 0.09 96
IV.HMDC.HHZ. 2021-02-17T06:14:52.55 0.6 undecidable manual S 330 4.1958 167 -0.13 50
IV.HAVL.HHZ. 2021-02-17T06:14:52.11 0.3 undecidable manual P 82 28.1496 120 -0.06 73
IV.HVZN.HHZ. 2021-02-17T06:14:52.04 0.6 undecidable manual P 344 29.1486 119 -0.26 47
IV.CROCE.HHZ. 2021-02-17T06:14:51.84 0.1 undecidable manual P 247 26.2515 122 -0.08 97
IV.ISPIC.HNZ. 2021-02-17T06:14:51.31 0.6 undecidable manual P 152 18.2706 134 0.38 47
IV.HMDC.HHZ. 2021-02-17T06:14:49.69 0.1 undecidable manual P 330 4.1958 167 -0.15 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HMDC.HHN. ML:1.9 0.0005729999999999999 0.34 AML other m 2021-02-17T06:14:52.85
IV.HMDC.HNN. ML:1.8 0.000531 0.36 AML other m 2021-02-17T06:14:52.86
IV.HMDC.HNE. ML:1.6 0.000309 0.4 AML other m 2021-02-17T06:14:52.87
IV.HMDC.HHE. ML:1.4 0.00021720455 0.0608 AML other m 2021-02-17T06:14:53.34
IV.CROCE.HHE. ML:1.5 0.00013900000000000002 0.34 AML other m 2021-02-17T06:14:56.43
IV.CROCE.HHN. ML:1.7 0.00020400000000000003 0.1 AML other m 2021-02-17T06:14:56.51
IV.CROCE.HNN. ML:1.7 0.00023516139999999998 0.0992 AML other m 2021-02-17T06:14:56.51
IV.CROCE.HNE. ML:1.5 0.00013364985000000003 0.6784 AML other m 2021-02-17T06:14:57.09
IV.SSY.HHE. ML:2.3 0.000725 0.28 AML other m 2021-02-17T06:14:58.95
IV.HVZN.HHE. ML:1.8 0.00028463450000000003 0.4 AML other m 2021-02-17T06:14:58.85
IV.HVZN.HNE. ML:1.8 0.00027823524999999997 0.4 AML other m 2021-02-17T06:14:58.86
IV.HVZN.HHN. ML:1.5 0.00014025114999999998 0.2816 AML other m 2021-02-17T06:14:59.23
IV.SSY.HHN. ML:2.3 0.0007255 0.66 AML other m 2021-02-17T06:14:59.32
IV.HCRL.HHN. ML:2.0 0.0002505 0.94 AML other m 2021-02-17T06:15:02.68
IV.HCRL.HHE. ML:2.0 0.000243 0.16 AML other m 2021-02-17T06:15:02.79
IV.HAGA.HHN. ML:1.4 0.00006526125500000001 0.1216 AML other m 2021-02-17T06:15:03.38
IV.HLNI.HHE. ML:1.9 0.000211 0.12 AML other m 2021-02-17T06:15:03.72
IV.HAGA.HHE. ML:1.4 0.00005334047 0.08 AML other m 2021-02-17T06:15:03.78
IV.HLNI.HHN. ML:1.6 0.00008774999999999999 0.56 AML other m 2021-02-17T06:15:03.52
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