Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 19-07-2021 and time 19:51:55 (Italy) in region 4 km E Cassaro (SR)

A magnitude ML 1.9 earthquake occured in region: 4 km E Cassaro (SR), on

  • 19-07-2021 17:51:55 (UTC)
  • 19-07-2021 19:51:55 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.0930, 14.9880 at 10 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 4 821 821
Ferla SR 5 2523 3344
Palazzolo Acreide SR 8 8808 12152
Sortino SR 9 8690 20842
Canicattini Bagni SR 9 7109 27951
Buscemi SR 9 1051 29002
Solarino SR 12 8091 37093
Buccheri SR 13 1999 39092
Floridia SR 15 22762 61854
Melilli SR 16 13621 75475
Giarratana RG 18 3048 78523
Francofonte SR 18 12800 91323
Priolo Gargallo SR 19 12091 103414
Monterosso Almo RG 20 3032 106446

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km W of Siracusa (122291 inhabitants)
29 Km NE of Ragusa (73313 inhabitants)
33 Km NE of Modica (54633 inhabitants)
43 Km E of Vittoria (63339 inhabitants)
47 Km S of Catania (314555 inhabitants)
60 Km S of Acireale (52622 inhabitants)
65 Km E of Gela (75827 inhabitants)
93 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 1.9 2021-07-19
17:51:55		 37.093 14.9877 10 2021-12-29
11:12:50		 Bollettino Sismico Italiano INGV 97207841
Reviewed
Rev100 		ML 1.9 2021-07-19
17:51:55		 37.0947 14.9862 13 2021-07-19
17:58:37		 Sala Sismica INGV-Roma 92961991
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-19 17:51:55 ± 0.1
Latitude 37.0930 ± 0.0054
Longitude 14.9877 ± 0.0079
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97207841

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 713
Semi-minor axis of confidence ellipse (meter) 418
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 115
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) 94
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.09443
Epicentral distance of station farthest from the epicenter (degree) 0.51441
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 97207841
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-03 17:04:51

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 92961991
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-19 17:58:37
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HVIT.HHZ. 2021-07-19T17:52:10.28 0.6 undecidable manual S 255 42.7239 50 0.87 38
IV.RAFF.HHZ. 2021-07-19T17:52:06.91 0.3 undecidable manual P 285 57.0984 50 1.22 46
IV.HLNI.HHZ. 2021-07-19T17:52:05.81 0.6 undecidable manual S 340 30.1476 50 -0.23 47
IV.HVZN.HHZ. 2021-07-19T17:52:05.05 0.6 undecidable manual S 292 25.8519 50 0.14 48
IV.HAGA.HHZ. 2021-07-19T17:52:04.74 0.3 undecidable manual S 35 25.9518 50 -0.18 72
IT.LNT.HGZ. 2021-07-19T17:52:03.78 0.3 undecidable manual S 3 21.6672 115 0.08 74
IV.HMDC.HHZ. 2021-07-19T17:52:03.80 0.3 undecidable manual S 231 23.4543 114 -0.45 68
IV.HVIT.HHZ. 2021-07-19T17:52:03.28 0.3 undecidable manual P 255 42.7239 50 -0.19 70
IV.HAVL.HHZ. 2021-07-19T17:52:03.13 0.3 undecidable manual S 141 18.9699 118 0.27 72
IV.HCRL.HHZ. 2021-07-19T17:52:03.67 0.3 undecidable manual S 11 21.4674 116 0.05 75
IV.HLNI.HHZ. 2021-07-19T17:52:01.18 0.3 undecidable manual P 340 30.1476 50 -0.35 69
IV.HCRL.HHZ. 2021-07-19T17:52:00.10 0.1 undecidable manual P 11 21.4674 116 -0.03 100
IV.HVZN.HHZ. 2021-07-19T17:52:00.84 0.3 undecidable manual P 292 25.8519 50 -0.04 74
IV.SSY.HHZ. 2021-07-19T17:52:00.61 0.3 undecidable manual S 47 10.4784 135 0.16 75
IT.LNT.HGZ. 2021-07-19T17:52:00.14 0.3 undecidable manual P 3 21.6672 115 -0.04 75
IV.HMDC.HHZ. 2021-07-19T17:52:00.24 0.1 undecidable manual P 231 23.4543 114 -0.26 95
IV.HAGA.HHZ. 2021-07-19T17:52:00.64 0.1 undecidable manual P 35 25.9518 50 -0.24 95
IV.HAVL.HHZ. 2021-07-19T17:51:59.62 0.1 undecidable manual P 141 18.9699 118 -0.07 100
IV.SSY.HHZ. 2021-07-19T17:51:58.48 0.1 undecidable manual P 47 10.4784 135 0.18 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SSY.HHE. ML:2.6 0.0059299999999999995 1.1 AML other m 2021-07-19T17:52:00.87
IV.SSY.HHN. ML:2.8 0.008675 0.18 AML other m 2021-07-19T17:52:03.31
IV.HCRL.HHE. ML:2.2 0.0010715 1.74 AML other m 2021-07-19T17:52:04.11
IV.HCRL.HHN. ML:2.1 0.0008005 0.56 AML other m 2021-07-19T17:52:04.59
IV.HMDC.HHE. ML:1.6 0.00028188219999999997 0.192 AML other m 2021-07-19T17:52:04.27
IV.HAVL.HHE. ML:1.8 0.0005295000000000001 0.18 AML other m 2021-07-19T17:52:04.79
IV.HAGA.HHE. ML:1.9 0.00043599999999999997 0.28 AML other m 2021-07-19T17:52:05.15
IV.HAGA.HHN. ML:1.8 0.00033699999999999995 1.48 AML other m 2021-07-19T17:52:05.16
IV.HVZN.HNN. ML:2.0 0.0005405 0.76 AML other m 2021-07-19T17:52:06.38
IV.HVZN.HHN. ML:2.0 0.000533 0.76 AML other m 2021-07-19T17:52:06.38
IV.HLNI.HHN. ML:1.5 0.00014800000000000002 0.32 AML other m 2021-07-19T17:52:06.64
IV.HLNI.HHE. ML:1.3 0.00010105 0.24 AML other m 2021-07-19T17:52:06.66
IV.HAVL.HHN. ML:1.9 0.0006274999999999999 0.58 AML other m 2021-07-19T17:52:07.35
IV.HMDC.HHN. ML:1.7 0.0002894206 0.4224 AML other m 2021-07-19T17:52:08.35
IV.HVZN.HHE. ML:2.0 0.000615 0.34 AML other m 2021-07-19T17:52:09.83
IV.HVZN.HNE. ML:2.0 0.0005805000000000001 0.36 AML other m 2021-07-19T17:52:09.84
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