Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 19-07-2021 and time 21:01:52 (Italy) in region Costa Siracusana (Siracusa)

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

  • 19-07-2021 19:01:52 (UTC)
  • 19-07-2021 21:01:52 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.0470, 15.3420 at 19 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 5 122291 122291
Floridia SR 17 22762 145053
Priolo Gargallo SR 19 12091 157144

Municipalities with at least 50000 inhabitants

An earthquake occurred to
5 Km E of Siracusa (122291 inhabitants)
56 Km SE of Catania (314555 inhabitants)
56 Km E of Modica (54633 inhabitants)
56 Km E of Ragusa (73313 inhabitants)
65 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 2021-07-19
19:01:52		 37.0472 15.3418 19 2021-12-29
11:12:50		 Bollettino Sismico Italiano INGV 97208061
Reviewed
Rev100 		ML 1.9 2021-07-19
19:01:52		 37.0473 15.326 22 2021-07-19
19:11:02		 Sala Sismica INGV-Roma 92963021
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-19 19:01:52 ± 0.12
Latitude 37.0472 ± 0.0054
Longitude 15.3418 ± 0.0090
Depth (km) 19 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97208061

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 636
Semi-minor axis of confidence ellipse (meter) 475
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 104
Circular confidence region, given by single value of horizontal uncertainty (meter) 640.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 248
Number of associated phases, regardless of their use for origin computation 18
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.79950
Number of stations at which the event was observed 11
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 12
Type of magnitude ML
Reference to an origin 97208061
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-03 17:13:48

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 92963021
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-19 19:11:02
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GIZZ.HHZ. 2021-07-19T19:02:26.21 3.0 positive manual Pn 0.09 0
IV.HVZN.HHZ. 2021-07-19T19:02:10.84 1.0 undecidable manual S 285 57.2982 100 0.15 23
IV.HPAC.HHZ. 2021-07-19T19:02:08.00 0.6 undecidable manual S 216 46.3203 103 0.19 46
IV.HMDC.HHZ. 2021-07-19T19:02:08.76 0.3 undecidable manual S 259 50.4162 101 -0.14 70
IV.RAFF.HHZ. 2021-07-19T19:02:08.30 0.3 undecidable manual P 283 88.7445 96 0.37 61
IV.HVIT.HHZ. 2021-07-19T19:02:05.10 0.3 undecidable manual P 265 72.8715 97 -0.4 64
IV.HCRL.HHZ. 2021-07-19T19:02:05.75 0.3 undecidable manual S 314 37.8288 106 0.12 71
IV.HAGA.HHZ. 2021-07-19T19:02:04.02 0.3 undecidable manual S 328 31.1466 111 0.1 73
IV.HVZN.HHZ. 2021-07-19T19:02:03.15 0.3 undecidable manual P 285 57.2982 100 0.03 70
IV.SSY.HHZ. 2021-07-19T19:02:02.84 0.3 undecidable manual S 297 26.751 115 0.01 74
IV.HLNI.HHZ. 2021-07-19T19:02:02.32 0.3 undecidable manual P 309 53.3022 100 -0.19 69
IV.HAVL.HHZ. 2021-07-19T19:02:01.67 0.3 undecidable manual S 244 21.7671 122 0 75
IV.HPAC.HHZ. 2021-07-19T19:02:01.56 0.3 undecidable manual P 216 46.3203 103 0.11 70
IV.HMDC.HHZ. 2021-07-19T19:02:01.79 0.1 undecidable manual P 259 50.4162 101 -0.29 90
IV.HCRL.HHZ. 2021-07-19T19:02:00.28 0.3 undecidable manual P 314 37.8288 106 0.09 72
IV.HAGA.HHZ. 2021-07-19T19:01:59.20 0.3 undecidable manual P 328 31.1466 111 -0.01 74
IV.SSY.HHZ. 2021-07-19T19:01:58.56 0.1 undecidable manual P 297 26.751 115 -0.02 99
IV.HAVL.HHZ. 2021-07-19T19:01:57.92 0.1 undecidable manual P 244 21.7671 122 0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HAVL.HHE. ML:2.0 0.0005465 0.28 AML other m 2021-07-19T19:02:01.77
IV.HAVL.HHN. ML:2.0 0.0005430000000000001 0.08 AML other m 2021-07-19T19:02:01.94
IV.SSY.HHE. ML:2.4 0.001177 1.08 AML other m 2021-07-19T19:02:03.89
IV.SSY.HHN. ML:2.8 0.003255 0.32 AML other m 2021-07-19T19:02:03.53
IV.HAGA.HHN. ML:1.5 0.000142 0.78 AML other m 2021-07-19T19:02:04.55
IV.HAGA.HHE. ML:1.7 0.00022250000000000001 0.7 AML other m 2021-07-19T19:02:04.68
IV.HCRL.HHE. ML:1.8 0.000212 1.82 AML other m 2021-07-19T19:02:05.03
IV.HCRL.HHN. ML:1.8 0.00021349999999999999 1.02 AML other m 2021-07-19T19:02:06.24
IV.HPAC.HHN. ML:2.0 0.0002535 0.36 AML other m 2021-07-19T19:02:08.37
IV.HPAC.HHE. ML:1.8 0.000166 0.72 AML other m 2021-07-19T19:02:09.47
IV.HVZN.HHE. ML:1.7 0.00011278830000000001 0.0928 AML other m 2021-07-19T19:02:11.84
IV.HVZN.HHN. ML:1.6 0.00007657951 0.2688 AML other m 2021-07-19T19:02:13.77
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