Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 23-07-2021 and time 05:29:35 (Italy) in region 1 km W Pozzallo (RG)

A magnitude ML 1.5 earthquake occured in region: 1 km W Pozzallo (RG), on

  • 23-07-2021 03:29:35 (UTC)
  • 23-07-2021 05:29:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 36.7290, 14.8380 at 28 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
Pozzallo RG 1 19552 19552
Ispica RG 9 16061 35613
Scicli RG 14 27077 62690
Rosolini SR 15 21427 84117
Modica RG 16 54633 138750

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km SE of Modica (54633 inhabitants)
24 Km SE of Ragusa (73313 inhabitants)
36 Km SE of Vittoria (63339 inhabitants)
55 Km SW of Siracusa (122291 inhabitants)
64 Km SE of Gela (75827 inhabitants)
89 Km S of Catania (314555 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 2021-07-23
03:29:35		 36.7293 14.838 28 2021-12-29
11:12:51		 Bollettino Sismico Italiano INGV 97345281
Reviewed
Rev100 		ML 1.5 2021-07-23
03:29:36		 36.7473 14.8422 24 2021-07-23
03:38:57		 Sala Sismica INGV-Roma 93089321
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-23 03:29:35 ± 0.21
Latitude 36.7293 ± 0.0081
Longitude 14.8380 ± 0.0079
Depth (km) 28 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97345281

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 891
Semi-minor axis of confidence ellipse (meter) 216
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 355
Circular confidence region, given by single value of horizontal uncertainty (meter) 890.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 271
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.23382
Epicentral distance of station farthest from the epicenter (degree) 0.61963
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 97345281
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-08 18:03:52

ML:1.5

Field Value
Value 1.5
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 93089321
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-23 03:38:57
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HLNI.HHZ. 2021-07-23T03:29:57.48 0.6 undecidable manual S 2 68.7756 107 -0.01 48
IV.HCRL.HHZ. 2021-07-23T03:29:56.42 0.6 undecidable manual S 16 63.7917 108 0.19 48
IV.HVZN.HHZ. 2021-07-23T03:29:53.25 0.6 undecidable manual S 348 51.0156 113 0.22 49
IV.HVIT.HHZ. 2021-07-23T03:29:50.67 0.6 undecidable manual S 316 40.5261 119 0.14 50
IV.HAVL.HHZ. 2021-07-23T03:29:49.51 0.6 undecidable manual S 45 35.8419 123 0.04 51
IV.HLNI.HHZ. 2021-07-23T03:29:48.17 0.1 undecidable manual P 2 68.7756 107 -0.24 93
IV.HAGA.HHZ. 2021-07-23T03:29:48.01 0.3 undecidable manual P 24 67.6767 107 -0.25 70
IV.HCRL.HHZ. 2021-07-23T03:29:47.72 0.1 undecidable manual P 16 63.7917 108 0.04 98
IV.HMDC.HHE. 2021-07-23T03:29:46.96 0.6 undecidable manual S 349 25.9518 133 -0.41 49
IV.HVZN.HHZ. 2021-07-23T03:29:45.99 0.3 undecidable manual P 348 51.0156 113 0.16 73
IV.HVIT.HHZ. 2021-07-23T03:29:44.28 0.3 undecidable manual P 316 40.5261 119 -0.1 76
IV.HAVL.HHZ. 2021-07-23T03:29:43.92 0.1 positive manual P 45 35.8419 123 0.14 100
IV.HMDC.HHE. 2021-07-23T03:29:42.59 0.3 undecidable manual P 349 25.9518 133 0.03 78
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HAVL.HHN. ML:1.6 0.000131 0.42 AML other m 2021-07-23T03:29:49.70
IV.HAVL.HHE. ML:1.5 0.0001064 0.2 AML other m 2021-07-23T03:29:49.61
IV.HVIT.HHN. ML:1.4 0.00007055000000000001 0.44 AML other m 2021-07-23T03:29:50.89
IV.HVIT.HHE. ML:1.6 0.0001055 0.14 AML other m 2021-07-23T03:29:50.85
IV.HLNI.HHN. ML:1.5 0.00004675 0.8 AML other m 2021-07-23T03:29:58.08
IV.HLNI.HHE. ML:1.5 0.000050299999999999996 1.02 AML other m 2021-07-23T03:29:58.58
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