Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 06-05-2021 and time 21:43:58 (Italy) in region 3 km SW Siracusa (SR)

A magnitude ML 1.7 earthquake occured in region: 3 km SW Siracusa (SR), on

  • 06-05-2021 19:43:58 (UTC)
  • 06-05-2021 21:43:58 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.0330, 15.2810 at 24 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 13 22762 145053
Solarino SR 16 8091 153144
Priolo Gargallo SR 16 12091 165235
Avola SR 19 31708 196943
Canicattini Bagni SR 19 7109 204052

Municipalities with at least 50000 inhabitants

An earthquake occurred to
3 Km SW of Siracusa (122291 inhabitants)
50 Km E of Modica (54633 inhabitants)
50 Km E of Ragusa (73313 inhabitants)
55 Km S of Catania (314555 inhabitants)
65 Km S of Acireale (52622 inhabitants)
67 Km E of Vittoria (63339 inhabitants)
92 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 1.7 2021-05-06
19:43:58		 37.0328 15.2808 24 2021-12-29
11:12:04		 Bollettino Sismico Italiano INGV 91096971
Reviewed
Rev100 		ML 1.8 2021-05-06
19:43:58		 37.0358 15.2618 27 2021-05-06
19:48:32		 Sala Sismica INGV-Roma 89850461
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-05-06 19:43:58 ± 0.14
Latitude 37.0328 ± 0.0036
Longitude 15.2808 ± 0.0090
Depth (km) 24 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 91096971

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 831
Semi-minor axis of confidence ellipse (meter) 163
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 99
Circular confidence region, given by single value of horizontal uncertainty (meter) 830.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 230
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.75633
Number of stations at which the event was observed 13
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 14
Type of magnitude ML
Reference to an origin 91096971
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-08 11:27:21

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 89850461
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-05-06 19:48:32
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GIZZ.HHZ. 2021-05-06T19:44:58.21 3.0 undecidable manual Sn -0.5 0
MN.CLTB.HHZ. 2021-05-06T19:44:53.47 3.0 undecidable manual Sg 0.72 0
IV.HVZN.HNZ. 2021-05-06T19:44:15.41 0.6 undecidable manual S 288 52.6029 108 0.2 45
IV.HLNI.HHZ. 2021-05-06T19:44:14.52 0.3 undecidable manual S 314 50.3163 109 -0.12 68
IV.RAFF.HHZ. 2021-05-06T19:44:13.14 0.6 undecidable manual P 285 83.9493 100 0.44 40
IV.HMDC.HHZ. 2021-05-06T19:44:13.24 0.3 undecidable manual S 260 44.8218 111 -0.03 70
IV.HPAC.HHZ. 2021-05-06T19:44:12.57 0.3 undecidable manual S 211 41.9247 113 0.01 70
IV.HCRL.HHZ. 2021-05-06T19:44:11.25 0.3 undecidable manual S 322 35.4423 118 0.28 68
IV.ENIC.HHZ. 2021-05-06T19:44:10.85 0.6 undecidable manual P 341 70.2741 103 0.22 43
IV.HAGA.HHZ. 2021-05-06T19:44:09.80 0.3 undecidable manual S 338 30.1476 123 0.05 72
IV.SSY.HHZ. 2021-05-06T19:44:08.36 0.3 undecidable manual S 307 22.9548 131 0.13 72
IV.HVZN.HNZ. 2021-05-06T19:44:07.62 0.3 undecidable manual P 288 52.6029 108 -0.38 64
IV.HLNI.HHZ. 2021-05-06T19:44:07.43 0.1 undecidable manual P 314 50.3163 109 -0.25 89
IV.HAVL.HHZ. 2021-05-06T19:44:07.00 0.3 undecidable manual S 240 16.2726 142 0.01 74
IV.HPAC.HHZ. 2021-05-06T19:44:06.59 0.1 undecidable manual P 211 41.9247 113 0.12 92
IV.HMDC.HHZ. 2021-05-06T19:44:06.66 0.1 undecidable manual P 260 44.8218 111 -0.23 90
IV.HSRS.HNN. 2021-05-06T19:44:05.82 0.3 undecidable manual S 322 8.4804 158 -0.13 74
IV.HCRL.HHZ. 2021-05-06T19:44:05.59 0.1 undecidable manual P 322 35.4423 118 0.04 95
IV.SSY.HHZ. 2021-05-06T19:44:04.07 0.1 undecidable manual P 307 22.9548 131 0.1 96
IV.HAGA.HHZ. 2021-05-06T19:44:04.79 0.1 undecidable manual P 338 30.1476 123 -0.06 96
IV.HAVL.HHZ. 2021-05-06T19:44:03.28 0.1 undecidable manual P 240 16.2726 142 0.03 98
IV.HSRS.HNN. 2021-05-06T19:44:02.66 0.1 undecidable manual P 322 8.4804 158 0 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HAVL.HHN. ML:2.0 0.0005620000000000001 1.06 AML other m 2021-05-06T19:44:07.12
IV.HAVL.HHE. ML:1.9 0.000397 1.04 AML other m 2021-05-06T19:44:07.40
IV.SSY.HHE. ML:1.9 0.0003765 0.32 AML other m 2021-05-06T19:44:08.85
IV.SSY.HHN. ML:2.2 0.0008065 0.12 AML other m 2021-05-06T19:44:09.91
IV.HAGA.HHN. ML:1.5 0.0001255 0.78 AML other m 2021-05-06T19:44:10.56
IV.HAGA.HHE. ML:1.8 0.00022 0.26 AML other m 2021-05-06T19:44:10.70
IV.HCRL.HHN. ML:1.6 0.0001265 0.18 AML other m 2021-05-06T19:44:11.45
IV.HCRL.HHE. ML:1.7 0.00016450000000000001 1.04 AML other m 2021-05-06T19:44:11.41
IV.HPAC.HHN. ML:1.8 0.0001855 0.44 AML other m 2021-05-06T19:44:13.17
IV.HMDC.HHE. ML:1.7 0.000141 0.72 AML other m 2021-05-06T19:44:13.64
IV.HMDC.HHN. ML:1.9 0.0001995 0.5 AML other m 2021-05-06T19:44:13.61
IV.HPAC.HHE. ML:1.6 0.00011999999999999999 0.88 AML other m 2021-05-06T19:44:14.48
IV.HLNI.HHE. ML:1.4 0.0000575 0.54 AML other m 2021-05-06T19:44:16.48
IV.HLNI.HHN. ML:1.4 0.00006120000000000001 0.7 AML other m 2021-05-06T19:44:17.57
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