Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 19-09-2021 and time 22:02:27 (Italy) in region Costa Siracusana (Siracusa)

A magnitude ML 1.9 earthquake occured in region: Costa Siracusana (Siracusa), on

  • 19-09-2021 20:02:27 (UTC)
  • 19-09-2021 22:02:27 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.0550, 15.3400 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 4 122291 122291
Floridia SR 17 22762 145053
Priolo Gargallo SR 18 12091 157144

Municipalities with at least 50000 inhabitants

An earthquake occurred to
4 Km E of Siracusa (122291 inhabitants)
55 Km SE of Catania (314555 inhabitants)
56 Km E of Modica (54633 inhabitants)
56 Km E of Ragusa (73313 inhabitants)
64 Km S of Acireale (52622 inhabitants)
72 Km E of Vittoria (63339 inhabitants)
97 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 1.9 2021-09-19
20:02:27		 37.0553 15.3403 24 2022-03-30
13:04:12		 Bollettino Sismico Italiano INGV 96797631
Reviewed
Rev100 		ML 1.9 2021-09-19
20:02:28		 37.0557 15.3132 24 2021-09-19
20:10:15		 Sala Sismica INGV-Roma 95640871
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-19 20:02:27 ± 0.14
Latitude 37.0553 ± 0.0045
Longitude 15.3403 ± 0.0101
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 96797631

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 630
Semi-minor axis of confidence ellipse (meter) 597
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 101
Circular confidence region, given by single value of horizontal uncertainty (meter) 630.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 226
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 27
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.10162
Epicentral distance of station farthest from the epicenter (degree) 0.70867
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 15
Magnitudes information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 21
Type of magnitude ML
Reference to an origin 95640871
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-19 20:10:15

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 21
Type of magnitude ML
Reference to an origin 96797631
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-20 10:21:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HVIT.HHZ. 2021-09-19T20:02:50.13 0.3 undecidable manual S 265 72.8715 102 -0.01 67
IV.EPOZ.HHZ. 2021-09-19T20:02:49.43 1.0 undecidable manual S 349 69.6747 103 0.11 22
IV.HVZN.HHZ. 2021-09-19T20:02:46.42 0.3 undecidable manual S 284 56.8986 106 0.4 64
IV.ISPIC.EHZ. 2021-09-19T20:02:44.04 0.3 undecidable manual S 232 49.3173 109 -0.05 70
IV.HLNI.HHZ. 2021-09-19T20:02:44.46 0.3 undecidable manual S 308 52.6029 108 -0.46 63
IV.HPAC.HHZ. 2021-09-19T20:02:43.89 0.3 undecidable manual S 215 46.9197 110 0.4 64
IV.EMFO.HHZ. 2021-09-19T20:02:42.07 0.1 undecidable manual P 344 78.6657 101 0.47 80
IV.ESLN.HHZ. 2021-09-19T20:02:41.57 0.3 undecidable manual P 336 77.7666 101 0.09 65
IT.LNT.HGZ. 2021-09-19T20:02:41.96 0.3 undecidable manual S 311 39.5271 114 0.31 68
IV.ESPC.HHZ. 2021-09-19T20:02:41.44 0.1 undecidable manual P 339 75.8685 102 0.25 84
IV.HCRL.HHZ. 2021-09-19T20:02:41.31 0.3 undecidable manual S 313 37.1295 116 0.24 69
IV.HVIT.HHZ. 2021-09-19T20:02:40.29 0.1 undecidable manual P 265 72.8715 102 -0.44 82
IV.EPOZ.HHZ. 2021-09-19T20:02:39.56 0.6 undecidable manual P 349 69.6747 103 -0.69 38
IV.HAGA.HHZ. 2021-09-19T20:02:39.51 0.6 undecidable manual S 327 30.2475 122 0.04 48
IV.HVZN.HHZ. 2021-09-19T20:02:38.69 0.1 undecidable manual P 284 56.8986 106 0.34 86
IV.SSY.HHZ. 2021-09-19T20:02:38.15 0.3 undecidable manual S 296 26.1516 127 -0.42 67
IV.HAVL.HHZ. 2021-09-19T20:02:37.74 0.3 undecidable manual S 241 22.0668 132 0.03 73
IV.ISPIC.EHZ. 2021-09-19T20:02:37.01 0.1 undecidable manual P 232 49.3173 109 -0.23 90
IV.HLNI.HHZ. 2021-09-19T20:02:37.43 0.1 undecidable manual P 308 52.6029 108 -0.29 88
IV.HPAC.HHZ. 2021-09-19T20:02:36.93 0.1 undecidable manual P 215 46.9197 110 0.04 92
IV.HCRL.HHZ. 2021-09-19T20:02:35.48 0.1 undecidable manual P 313 37.1295 116 -0.02 95
IT.LNT.HGZ. 2021-09-19T20:02:35.84 0.3 undecidable manual P 311 39.5271 114 0.01 71
IV.HSRS.HHZ. 2021-09-19T20:02:35.73 0.3 undecidable manual S 292 11.2776 152 -0.19 72
IV.SSY.HHZ. 2021-09-19T20:02:34.02 0.1 undecidable manual P 296 26.1516 127 -0.02 97
IV.HAGA.HHZ. 2021-09-19T20:02:34.51 0.1 undecidable manual P 327 30.2475 122 -0.06 96
IV.HAVL.HHZ. 2021-09-19T20:02:33.54 0.1 undecidable manual P 241 22.0668 132 -0.02 98
IV.HSRS.HHZ. 2021-09-19T20:02:32.50 0.1 undecidable manual P 292 11.2776 152 -0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HSRS.HHE. ML:1.7 0.00030523050000000004 0.128 AML other m 2021-09-19T20:02:36.04
IV.HSRS.HHN. ML:1.5 0.00019289628965 0.128 AML other m 2021-09-19T20:02:36.14
IV.HAVL.HHN. ML:2.4 0.0012187785 0.0768 AML other m 2021-09-19T20:02:37.98
IV.HAVL.HHE. ML:2.3 0.0009745 0.08 AML other m 2021-09-19T20:02:37.99
IV.SSY.HHE. ML:2.4 0.0011057218500000001 0.1408 AML other m 2021-09-19T20:02:39.09
IV.HAGA.HHN. ML:1.7 0.00016974695 0.1664 AML other m 2021-09-19T20:02:39.71
IV.HAGA.HHE. ML:1.4 0.00009964972 0.1152 AML other m 2021-09-19T20:02:39.74
IV.SSY.HHN. ML:2.6 0.0018824025 1.8976 AML other m 2021-09-19T20:02:40.97
IV.HCRL.HHE. ML:1.9 0.000244 0.1 AML other m 2021-09-19T20:02:41.50
IV.HCRL.HHN. ML:1.7 0.0001465 0.48 AML other m 2021-09-19T20:02:43.27
IV.HPAC.HHE. ML:2.2 0.00036761105 0.2432 AML other m 2021-09-19T20:02:44.15
IV.ISPIC.EHN. ML:1.6 0.00009392956999999999 0.1024 AML other m 2021-09-19T20:02:44.11
IV.ISPIC.EHE. ML:1.7 0.00011477750000000001 0.1536 AML other m 2021-09-19T20:02:44.15
IV.HLNI.HHE. ML:1.8 0.000143377815 0.1024 AML other m 2021-09-19T20:02:45.11
IV.HLNI.HHN. ML:1.8 0.00013891324999999998 0.1024 AML other m 2021-09-19T20:02:45.47
IV.HVZN.HHN. ML:2.2 0.00034743059999999996 1.7184 AML other m 2021-09-19T20:02:48.87
IV.HVZN.HNN. ML:2.2 0.00032350755000000003 1.744 AML other m 2021-09-19T20:02:48.88
IV.HVZN.HHE. ML:1.9 0.0001523236 0.3328 AML other m 2021-09-19T20:02:49.20
IV.HVZN.HNE. ML:1.9 0.0001503048 0.32 AML other m 2021-09-19T20:02:49.21
IV.HVIT.HHE. ML:1.9 0.000120616085 0.1024 AML other m 2021-09-19T20:02:50.97
IV.HVIT.HHN. ML:1.9 0.000121027695 0.0512 AML other m 2021-09-19T20:02:52.13
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