Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 21-05-2021 and time 22:55:42 (Italy) in region 3 km E Cassaro (SR)

A magnitude ML 1.5 earthquake occured in region: 3 km E Cassaro (SR), on

  • 21-05-2021 20:55:42 (UTC)
  • 21-05-2021 22:55:42 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.0970, 14.9740 at 7 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
Cassaro SR 3 821 821
Ferla SR 4 2523 3344
Palazzolo Acreide SR 7 8808 12152
Buscemi SR 8 1051 13203
Sortino SR 9 8690 21893
Canicattini Bagni SR 10 7109 29002
Buccheri SR 11 1999 31001
Solarino SR 13 8091 39092
Floridia SR 16 22762 61854
Melilli SR 16 13621 75475
Giarratana RG 17 3048 78523
Francofonte SR 17 12800 91323
Monterosso Almo RG 19 3032 94355

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km W of Siracusa (122291 inhabitants)
29 Km NE of Ragusa (73313 inhabitants)
32 Km NE of Modica (54633 inhabitants)
42 Km E of Vittoria (63339 inhabitants)
46 Km S of Catania (314555 inhabitants)
60 Km S of Acireale (52622 inhabitants)
64 Km E of Gela (75827 inhabitants)
92 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 1.5 2021-05-21
20:55:42		 37.0967 14.9738 7 2021-12-29
11:12:32		 Bollettino Sismico Italiano INGV 95737961
Reviewed
Rev100 		ML 1.6 2021-05-21
20:55:42		 37.0917 14.9853 11 2021-05-21
21:01:28		 Sala Sismica INGV-Roma 90349541
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-05-21 20:55:42 ± 0.08
Latitude 37.0967 ± 0.0045
Longitude 14.9738 ± 0.0056
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 95737961

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 449
Semi-minor axis of confidence ellipse (meter) 348
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 306
Circular confidence region, given by single value of horizontal uncertainty (meter) 450.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 55
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.10072
Epicentral distance of station farthest from the epicenter (degree) 0.39120
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:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 95737961
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-22 11:27:20

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 90349541
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-05-21 21:01:28
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HPAC.HHE. 2021-05-21T20:55:58.11 0.3 undecidable manual S 173 43.4232 50 0.71 61
IV.HVIT.HHZ. 2021-05-21T20:55:57.01 0.3 undecidable manual S 254 41.625 50 0.07 72
IV.HLNI.HHZ. 2021-05-21T20:55:53.19 0.3 undecidable manual S 342 29.3484 103 0.31 71
IV.HAGA.HHZ. 2021-05-21T20:55:51.52 0.3 undecidable manual S 37 26.3514 105 -0.34 70
IV.HPAC.HHE. 2021-05-21T20:55:51.10 0.6 undecidable manual P 173 43.4232 50 0.03 49
IV.HVZN.HHZ. 2021-05-21T20:55:51.50 0.6 undecidable manual S 292 24.5532 106 0.22 48
IT.LNT.HGZ. 2021-05-21T20:55:50.54 0.6 undecidable manual S 7 21.4674 108 0.31 48
IV.HAVL.HHZ. 2021-05-21T20:55:50.08 0.3 undecidable manual S 139 20.0688 109 0.29 72
IV.HSRS.HHE. 2021-05-21T20:55:50.27 0.3 undecidable manual S 91 21.9669 107 -0.14 74
IV.HCRL.HHZ. 2021-05-21T20:55:50.52 0.3 undecidable manual S 14 21.3675 108 0.33 71
IV.HVIT.HHZ. 2021-05-21T20:55:50.34 0.3 undecidable manual P 254 41.625 50 -0.46 67
IV.HMDC.HHZ. 2021-05-21T20:55:50.52 0.6 undecidable manual S 228 22.755 107 -0.15 49
IV.HLNI.HHZ. 2021-05-21T20:55:47.91 0.1 undecidable manual P 342 29.3484 103 -0.56 88
IV.HCRL.HHZ. 2021-05-21T20:55:47.00 0.1 undecidable manual P 14 21.3675 108 0.09 100
IV.HMDC.HHZ. 2021-05-21T20:55:47.12 0.1 undecidable manual P 228 22.755 107 -0.07 100
IV.HAGA.HHZ. 2021-05-21T20:55:47.49 0.1 undecidable manual P 37 26.3514 105 -0.38 93
IV.HVZN.HHZ. 2021-05-21T20:55:47.65 0.1 undecidable manual P 292 24.5532 106 0.12 99
IV.SSY.HHZ. 2021-05-21T20:55:47.41 0.3 undecidable manual S 53 11.1777 122 0.44 71
IT.LNT.HGZ. 2021-05-21T20:55:46.84 0.6 undecidable manual P 7 21.4674 108 -0.09 50
IV.HAVL.HHZ. 2021-05-21T20:55:46.43 0.1 undecidable manual P 139 20.0688 109 -0.25 97
IV.HSRS.HHE. 2021-05-21T20:55:46.73 0.1 undecidable manual P 91 21.9669 107 -0.31 95
IV.SSY.HHZ. 2021-05-21T20:55:45.31 0.1 undecidable manual P 53 11.1777 122 0.27 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SSY.HHE. ML:2.1 0.001805471 0.1152 AML other m 2021-05-21T20:55:48.15
IV.SSY.HHN. ML:2.4 0.0031450000000000002 0.18 AML other m 2021-05-21T20:55:48.77
IV.HCRL.HHN. ML:1.8 0.00041564955000000006 0.1152 AML other m 2021-05-21T20:55:51.44
IV.HMDC.HHE. ML:1.4 0.00016728569999999998 0.1792 AML other m 2021-05-21T20:55:51.20
IV.HCRL.HHE. ML:1.8 0.00047113875000000005 0.2176 AML other m 2021-05-21T20:55:52.05
IV.HAGA.HHN. ML:1.2 0.00009665550000000001 0.256 AML other m 2021-05-21T20:55:51.99
IV.HAVL.HHE. ML:1.5 0.00025550000000000003 0.16 AML other m 2021-05-21T20:55:51.72
IV.HAGA.HHE. ML:1.4 0.00015610605 0.1664 AML other m 2021-05-21T20:55:51.97
IV.HVZN.HHE. ML:1.6 0.00022495500000000002 0.1792 AML other m 2021-05-21T20:55:52.88
IV.HLNI.HHN. ML:0.0 0.00007640315 0.0768 AML other m 2021-05-21T20:55:54.17
IV.HVZN.HHN. ML:1.5 0.0002151075 0.1792 AML other m 2021-05-21T20:55:53.20
IV.HLNI.HHE. ML:0.0 0.00007730112 0.128 AML other m 2021-05-21T20:55:53.92
IV.HMDC.HHN. ML:1.3 0.00013190570000000003 0.0896 AML other m 2021-05-21T20:55:53.03
IV.HAVL.HHN. ML:1.4 0.00020256355 0.064 AML other m 2021-05-21T20:55:51.23
IV.HMDC.HNE. ML:1.1 0.000091480795 0.1152 AML other m 2021-05-21T20:55:51.78
IV.HMDC.HNN. ML:1.3 0.00014164893 0.1536 AML other m 2021-05-21T20:55:51.67
IV.HVZN.HNN. ML:1.5 0.00018108774 0.1664 AML other m 2021-05-21T20:55:53.21
IV.HVZN.HNE. ML:1.5 0.0002041318 0.192 AML other m 2021-05-21T20:55:52.90
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