Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 02-05-2021 and time 05:30:44 (Italy) in region Costa Siracusana (Siracusa)

A magnitude ML 1.7 earthquake occured in region: Costa Siracusana (Siracusa), on

  • 02-05-2021 03:30:44 (UTC)
  • 02-05-2021 05:30:44 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.1380, 15.5910 at 20 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
28 Km E of Siracusa (122291 inhabitants)
60 Km SE of Catania (314555 inhabitants)
65 Km SE of Acireale (52622 inhabitants)
80 Km E of Ragusa (73313 inhabitants)
80 Km E of Modica (54633 inhabitants)
96 Km E of Vittoria (63339 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 2021-05-02
03:30:44		 37.1383 15.5913 20 2021-12-29
11:12:22		 Bollettino Sismico Italiano INGV 94591071
Reviewed
Rev100 		ML 1.7 2021-05-02
03:30:44		 37.1277 15.5907 10 2021-05-02
03:45:46		 Sala Sismica INGV-Roma 89690671
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-05-02 03:30:44 ± 0.14
Latitude 37.1383 ± 0.0045
Longitude 15.5913 ± 0.0079
Depth (km) 20 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 94591071

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 715
Semi-minor axis of confidence ellipse (meter) 238
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 271
Circular confidence region, given by single value of horizontal uncertainty (meter) 710.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 293
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 17
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) 0.29768
Epicentral distance of station farthest from the epicenter (degree) 0.69877
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 94591071
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-07 10:34:36

ML:1.7

Field Value
Value 1.7
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 89690671
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-05-02 03:45:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HVZN.HHZ. 2021-05-02T03:31:08.35 0.6 undecidable manual S 274 77.5668 97 0.16 45
IV.HMDC.HHZ. 2021-05-02T03:31:07.30 0.3 undecidable manual S 255 74.2701 98 -0.03 70
IV.HPAC.HHE. 2021-05-02T03:31:06.10 0.3 undecidable manual S 226 68.4759 99 0.31 68
IV.HLNI.HHZ. 2021-05-02T03:31:05.40 0.1 undecidable manual S 290 67.6767 99 -0.18 93
IV.HCRL.HHZ. 2021-05-02T03:31:01.70 0.1 undecidable manual S 288 51.9036 102 0.26 93
IV.HAVL.HHZ. 2021-05-02T03:30:59.60 0.3 undecidable manual S 245 46.0206 104 -0.32 70
IV.SSY.HHZ. 2021-05-02T03:30:59.90 0.6 undecidable manual S 273 45.8208 104 0.04 49
IV.HVZN.HHZ. 2021-05-02T03:30:58.53 0.1 undecidable manual P 274 77.5668 97 0.19 91
IV.HAGA.HHZ. 2021-05-02T03:30:58.90 0.3 undecidable manual S 293 41.8248 106 0.07 74
IV.HMDC.HHZ. 2021-05-02T03:30:57.62 0.1 undecidable manual P 255 74.2701 98 -0.22 90
IV.HPAC.HHE. 2021-05-02T03:30:56.94 0.1 undecidable manual P 226 68.4759 99 -0.02 94
IV.HLNI.HHZ. 2021-05-02T03:30:56.65 0.1 undecidable manual P 290 67.6767 99 -0.19 92
IV.HCRL.HHZ. 2021-05-02T03:30:54.57 0.1 undecidable manual P 288 51.9036 102 0.12 96
IV.HAVL.HHZ. 2021-05-02T03:30:53.51 0.1 undecidable manual P 245 46.0206 104 -0.05 98
IV.SSY.HHZ. 2021-05-02T03:30:53.51 0.3 undecidable manual P 273 45.8208 104 -0.02 74
IV.HAGA.HHZ. 2021-05-02T03:30:52.92 0.3 undecidable manual P 293 41.8248 106 -0.02 75
IV.HSRS.HHE. 2021-05-02T03:30:51.58 0.1 undecidable manual P 261 33.0447 111 -0.07 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HAGA.HHE. ML:1.4 0.000068210455 0.0816 AML other m 2021-05-02T03:30:59.19
IV.HAGA.HHN. ML:1.4 0.000067675615 0.0992 AML other m 2021-05-02T03:30:59.41
IV.HAVL.HHN. ML:1.8 0.000177723455 0.08 AML other m 2021-05-02T03:31:00.22
IV.HAVL.HHE. ML:1.8 0.0001488352 0.0816 AML other m 2021-05-02T03:31:00.27
IV.SSY.HHE. ML:1.9 0.00022401044999999998 0.1392 AML other m 2021-05-02T03:31:00.49
IV.SSY.HHN. ML:2.2 0.00042907139999999997 0.1808 AML other m 2021-05-02T03:31:01.98
IV.HCRL.HHE. ML:1.7 0.00011249292999999999 0.16 AML other m 2021-05-02T03:31:02.12
IV.HCRL.HHN. ML:1.5 0.000078929405 0.0992 AML other m 2021-05-02T03:31:03.16
IV.HLNI.HHN. ML:1.8 0.00009785551000000001 0.0992 AML other m 2021-05-02T03:31:06.05
IV.HLNI.HHE. ML:1.6 0.0000617591 0.1008 AML other m 2021-05-02T03:31:06.40
IV.HMDC.HNN. ML:2.0 0.00015114084999999998 0.5504 AML other m 2021-05-02T03:31:08.40
IV.HMDC.HHE. ML:1.6 0.000057525199999999996 0.1184 AML other m 2021-05-02T03:31:08.57
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