Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 22-09-2021 and time 02:49:54 (Italy) in region 7 km S Floridia (SR)

A magnitude ML 1.2 earthquake occured in region: 7 km S Floridia (SR), on

  • 22-09-2021 00:49:54 (UTC)
  • 22-09-2021 02:49:54 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.0180, 15.1750 at 24 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Floridia SR 8 22762 22762
Canicattini Bagni SR 10 7109 29871
Solarino SR 11 8091 37962
Siracusa SR 12 122291 160253
Avola SR 13 31708 191961
Priolo Gargallo SR 16 12091 204052
Noto SR 17 23913 227965
Melilli SR 18 13621 241586

Municipalities with at least 50000 inhabitants

An earthquake occurred to
12 Km W of Siracusa (122291 inhabitants)
41 Km E of Modica (54633 inhabitants)
41 Km E of Ragusa (73313 inhabitants)
55 Km S of Catania (314555 inhabitants)
57 Km E of Vittoria (63339 inhabitants)
66 Km S of Acireale (52622 inhabitants)
82 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
Reviewed
Rev100 		ML 1.2 2021-09-22
00:49:54		 37.0182 15.1748 24 2021-09-22
00:55:23		 Sala Sismica INGV-Roma 95717841
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-22 00:49:54 ± 0.15
Latitude 37.0182 ± 0.0054
Longitude 15.1748 ± 0.0113
Depth (km) 24 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95717841

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1034
Semi-minor axis of confidence ellipse (meter) 256
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) 1030.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 173
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.40919
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 5
Type of magnitude ML
Reference to an origin 95717841
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-22 00:55:23
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EFIU.HHZ. 2021-09-22T00:50:10.45 3.0 negative manual P 0.02 0
IV.HMDC.HHZ. 2021-09-22T00:50:07.35 0.3 undecidable manual S 259 35.3424 117 -0.14 70
IV.HCRL.HHE. 2021-09-22T00:50:06.81 0.3 undecidable manual S 337 31.9458 120 0.11 71
IV.SSY.HHZ. 2021-09-22T00:50:04.27 0.3 undecidable manual S 330 17.871 138 0.53 66
IV.HLNI.HHZ. 2021-09-22T00:50:03.24 0.3 undecidable manual P 324 45.4212 110 -0.3 67
IV.HPAC.HHE. 2021-09-22T00:50:02.48 0.3 undecidable manual P 200 36.4413 116 0.21 69
IV.HMDC.HHZ. 2021-09-22T00:50:02.06 0.6 negative manual P 259 35.3424 117 -0.06 48
IV.HAVL.HHZ. 2021-09-22T00:50:02.30 0.3 undecidable manual S 216 7.9809 159 -0.04 75
IV.HSRS.HHE. 2021-09-22T00:50:02.27 0.3 undecidable manual S 27 9.2796 156 -0.2 73
IV.ISPIC.EHE. 2021-09-22T00:50:02.23 0.3 undecidable manual P 223 35.742 116 0.06 71
IV.HCRL.HHE. 2021-09-22T00:50:01.66 0.3 undecidable manual P 337 31.9458 120 0 72
IV.HAGA.HHE. 2021-09-22T00:50:01.24 0.3 undecidable manual P 357 29.6481 122 -0.11 72
IV.HAVL.HHZ. 2021-09-22T00:49:59.14 0.6 positive manual P 216 7.9809 159 0 51
IV.HSRS.HHE. 2021-09-22T00:49:59.15 0.1 undecidable manual P 27 9.2796 156 -0.07 100
IV.SSY.HHZ. 2021-09-22T00:49:59.96 0.3 undecidable manual P 330 17.871 138 0.01 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HAVL.HHE. ML:0.9 0.000054623685 0.1 AML other m 2021-09-22T00:50:02.32
IV.HAVL.HHN. ML:1.1 0.000081508525 0.06 AML other m 2021-09-22T00:50:02.38
IV.SSY.HHE. ML:1.3 0.00009740871499999999 0.88 AML other m 2021-09-22T00:50:04.93
IV.HMDC.HHE. ML:1.1 0.000044799955 0.74 AML other m 2021-09-22T00:50:05.95
IV.HMDC.HHN. ML:1.5 0.00009369876 1.34 AML other m 2021-09-22T00:50:05.48
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