Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.1 on date 17-02-2021 and time 01:01:11 (Italy) in region 3 km S Siracusa (SR)

A magnitude ML 2.1 earthquake occured in region: 3 km S Siracusa (SR), on

  • 17-02-2021 00:01:11 (UTC)
  • 17-02-2021 01:01:11 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.0340, 15.3040 at 15 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
Siracusa SR 3 122291 122291
Floridia SR 14 22762 145053
Priolo Gargallo SR 17 12091 157144
Solarino SR 18 8091 165235

Municipalities with at least 50000 inhabitants

An earthquake occurred to
3 Km S of Siracusa (122291 inhabitants)
52 Km E of Modica (54633 inhabitants)
52 Km E of Ragusa (73313 inhabitants)
56 Km SE of Catania (314555 inhabitants)
66 Km S of Acireale (52622 inhabitants)
69 Km E of Vittoria (63339 inhabitants)
94 Km E 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 2.1 2021-02-17
00:01:11		 37.0343 15.3042 15 2021-07-12
16:54:59		 Bollettino Sismico Italiano INGV 87269621
Reviewed
Rev100 		ML 2.1 2021-02-17
00:01:11		 37.0407 15.2735 15 2021-02-17
00:16:22		 Sala Sismica INGV-Roma 87223151
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-17 00:01:11 ± 0.27
Latitude 37.0343 ± 0.0063
Longitude 15.3042 ± 0.0169
Depth (km) 15 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 87269621

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1156
Semi-minor axis of confidence ellipse (meter) 934
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 92
Circular confidence region, given by single value of horizontal uncertainty (meter) 1160.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 257
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.34
Epicentral distance of station closest to the epicenter (degree) 0.08813
Epicentral distance of station farthest from the epicenter (degree) 0.98206
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 87223151
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-17 00:16:22

ML:2.1

Field Value
Value 2.1
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 87269621
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-03-20 08:24:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RAFF.HHZ. 2021-02-17T00:01:38.92 0.6 undecidable manual S 284 85.8474 93 2.11 16
IV.CROCE.HHZ. 2021-02-17T00:01:33.03 0.6 undecidable manual S 252 71.7726 94 -0.04 45
IV.CPTP.HHZ. 2021-02-17T00:01:31.20 0.1 undecidable manual P 293 109.0131 93 1.57 46
IV.HVZN.HHZ. 2021-02-17T00:01:28.72 0.6 undecidable manual S 287 54.501 96 0.27 45
IV.HLNI.HHZ. 2021-02-17T00:01:27.19 0.6 undecidable manual S 313 51.7038 96 -0.53 43
IV.HMDC.HHZ. 2021-02-17T00:01:26.21 0.6 undecidable manual S 260 46.9197 97 -0.24 46
IV.RAFF.HHZ. 2021-02-17T00:01:26.40 0.1 undecidable manual P 284 85.8474 93 0.33 84
IV.ISPIC.EHZ. 2021-02-17T00:01:26.03 0.6 undecidable manual S 232 45.3213 98 -0.01 48
IT.LNT.HGE. 2021-02-17T00:01:24.03 0.6 undecidable manual S 317 38.8278 99 -0.28 46
IV.ACATE.EHZ. 2021-02-17T00:01:23.79 0.1 undecidable manual P 269 71.1732 94 -0.02 92
IV.HCRL.HHZ. 2021-02-17T00:01:23.26 0.6 undecidable manual S 319 36.5412 100 -0.46 45
IV.CROCE.HHZ. 2021-02-17T00:01:23.52 0.1 positive manual P 252 71.7726 94 -0.39 85
IV.HAGA.HHZ. 2021-02-17T00:01:22.14 0.6 undecidable manual S 335 30.747 103 -0.06 49
IV.HVZN.HHZ. 2021-02-17T00:01:21.29 0.1 undecidable manual P 287 54.501 96 0.05 94
IV.HLNI.HHZ. 2021-02-17T00:01:20.54 0.1 undecidable manual P 313 51.7038 96 -0.28 90
IV.SSY.HHZ. 2021-02-17T00:01:20.50 0.3 undecidable manual S 304 24.5532 109 -0.1 73
IV.ISPIC.EHZ. 2021-02-17T00:01:19.69 0.3 undecidable manual P 232 45.3213 98 -0.16 70
IV.HMDC.HHZ. 2021-02-17T00:01:19.79 0.1 positive manual P 260 46.9197 97 -0.3 91
IV.HCRL.HHZ. 2021-02-17T00:01:18.50 0.1 negative manual P 319 36.5412 100 -0.01 98
IV.HAVL.HHZ. 2021-02-17T00:01:18.99 0.3 undecidable manual S 243 18.1707 118 -0.04 75
IT.LNT.HGE. 2021-02-17T00:01:18.84 0.3 undecidable manual P 317 38.8278 99 -0.01 73
IV.HAGA.HHZ. 2021-02-17T00:01:17.57 0.1 undecidable manual P 335 30.747 103 -0.07 98
IV.HSRS.HHE. 2021-02-17T00:01:17.45 0.3 undecidable manual S 312 9.7791 140 0.17 76
IV.SSY.HHZ. 2021-02-17T00:01:16.70 0.1 negative manual P 304 24.5532 109 -0.01 100
IV.HAVL.HHZ. 2021-02-17T00:01:15.93 0.1 positive manual P 243 18.1707 118 0.12 99
IV.HSRS.HHE. 2021-02-17T00:01:14.97 0.1 negative manual P 312 9.7791 140 0.17 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HAVL.HHN. ML:3.1 0.008150000000000001 0.32 AML other m 2021-02-17T00:01:19.23
IV.HAVL.HHE. ML:3.0 0.007279999999999999 0.26 AML other m 2021-02-17T00:01:19.51
IV.SSY.HHE. ML:2.7 0.002645 0.18 AML other m 2021-02-17T00:01:20.59
IV.SSY.HHN. ML:3.0 0.00554 0.7 AML other m 2021-02-17T00:01:22.54
IV.HAGA.HHN. ML:2.0 0.0004335 0.82 AML other m 2021-02-17T00:01:22.69
IV.HAGA.HHE. ML:1.8 0.0002775 0.82 AML other m 2021-02-17T00:01:24.74
IV.HCRL.HHE. ML:2.1 0.00047 0.92 AML other m 2021-02-17T00:01:25.25
IV.HCRL.HHN. ML:2.1 0.0004505 1.38 AML other m 2021-02-17T00:01:25.05
IV.HMDC.HHN. ML:2.2 0.00045850000000000003 0.18 AML other m 2021-02-17T00:01:27.35
IV.HMDC.HNN. ML:2.2 0.000383 0.74 AML other m 2021-02-17T00:01:27.36
IV.HMDC.HHE. ML:2.0 0.000255 0.64 AML other m 2021-02-17T00:01:27.71
IV.HMDC.HNE. ML:1.8 0.00017912475 0.21 AML other m 2021-02-17T00:01:28.54
IV.HVZN.HNN. ML:2.1 0.0003155 0.82 AML other m 2021-02-17T00:01:29.81
IV.HLNI.HHN. ML:1.9 0.0001785 1.36 AML other m 2021-02-17T00:01:30.08
IV.HVZN.HHE. ML:2.1 0.00028199999999999997 0.94 AML other m 2021-02-17T00:01:31.36
IV.HVZN.HNE. ML:2.1 0.0002745 0.94 AML other m 2021-02-17T00:01:31.37
IV.HVZN.HHN. ML:2.1 0.0003135 0.9 AML other m 2021-02-17T00:01:32.13
IV.HLNI.HHE. ML:1.8 0.000142 0.1 AML other m 2021-02-17T00:01:32.91
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