Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 17-10-2023 and time 20:00:11 (UTC) in region Costa Siracusana (Siracusa)

A magnitude ML 1.4 earthquake occured in region: Costa Siracusana (Siracusa), on

  • 17-10-2023 20:00:11 (UTC)
  • 17-10-2023 22:00:11 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.1140, 15.3480 at 23 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
Siracusa SR 8 122291 122291
Priolo Gargallo SR 15 12091 134382
Augusta SR 17 36305 170687
Floridia SR 18 22762 193449

Municipalities with at least 50000 inhabitants

An earthquake occurred to
8 Km NE of Siracusa (122291 inhabitants)
49 Km SE of Catania (314555 inhabitants)
58 Km S of Acireale (52622 inhabitants)
59 Km E of Ragusa (73313 inhabitants)
59 Km NE of Modica (54633 inhabitants)
74 Km E of Vittoria (63339 inhabitants)
98 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 1.4 2023-10-17
20:00:11		 37.1138 15.3482 23 2023-10-17
20:08:01		 Sala Sismica INGV-Roma 122161561
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-10-17 20:00:11 ± 0.14
Latitude 37.1138 ± 0.0054
Longitude 15.3482 ± 0.0090
Depth (km) 23 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 122161561

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 800
Semi-minor axis of confidence ellipse (meter) 163
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 256
Circular confidence region, given by single value of horizontal uncertainty (meter) 800.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 254
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
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) 0.10252
Epicentral distance of station farthest from the epicenter (degree) 0.48743
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 122161561
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-10-17 20:08:01
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HMDC.HHE. 2023-10-17T20:00:28.14 0.6 undecidable manual S 251 52.9026 106 0.1 47
IV.HLNI.HHZ. 2023-10-17T20:00:27.13 0.3 undecidable manual S 302 49.5171 107 -0.03 71
IV.ISPIC.HHZ. 2023-10-17T20:00:21.15 0.3 negative manual P 227 54.1014 105 0.12 70
IV.SSY.HHZ. 2023-10-17T20:00:21.05 0.6 undecidable manual S 281 24.753 126 -0.15 48
IV.HAGA.HHE. 2023-10-17T20:00:21.55 0.3 undecidable manual S 318 25.5522 125 0.19 72
IV.HAVL.HHZ. 2023-10-17T20:00:21.20 0.3 undecidable manual S 230 26.3514 124 -0.34 69
IV.HMDC.HHE. 2023-10-17T20:00:20.88 0.1 undecidable manual P 251 52.9026 106 0.03 95
IV.HLNI.HHZ. 2023-10-17T20:00:20.38 0.6 negative manual P 302 49.5171 107 0.04 48
7C.SPAOL.HNZ. 2023-10-17T20:00:20.60 0.1 undecidable manual P 333 54.1014 105 -0.43 86
IV.AGST.EHZ. 2023-10-17T20:00:19.77 0.6 undecidable manual S 326 19.0698 134 -0.26 48
IV.HSRS.HHZ. 2023-10-17T20:00:18.60 0.3 undecidable manual S 258 11.3775 150 -0.16 74
IV.HAVL.HHZ. 2023-10-17T20:00:17.30 0.1 positive manual P 230 26.3514 124 0.2 96
IV.SSY.HHZ. 2023-10-17T20:00:17.01 0.1 undecidable manual P 281 24.753 126 0.11 98
IV.HAGA.HHE. 2023-10-17T20:00:17.13 0.1 undecidable manual P 318 25.5522 125 0.14 97
IV.AGST.EHZ. 2023-10-17T20:00:16.28 0.1 negative manual P 326 19.0698 134 0.05 100
IV.HSRS.HHZ. 2023-10-17T20:00:15.60 0.1 negative manual P 258 11.3775 150 0.11 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HSRS.HHN. ML:1.1 0.00007449205000000001 0.1536 AML other m 2023-10-17T20:00:19.16
IV.HSRS.HHE. ML:1.4 0.00015210959 0.1792 AML other m 2023-10-17T20:00:18.89
IV.HAVL.HHE. ML:1.5 0.000140828645 0.0768 AML other m 2023-10-17T20:00:21.84
IV.HAVL.HHN. ML:1.7 0.00020500000000000002 1.7 AML other m 2023-10-17T20:00:22.89
IV.SSY.HHE. ML:1.2 0.00006887978 0.1152 AML other m 2023-10-17T20:00:21.68
IV.SSY.HHN. ML:1.5 0.00014662176999999998 0.1408 AML other m 2023-10-17T20:00:24.92
IV.AGST.EHE. ML:1.2 0.000084749335 0.0768 AML other m 2023-10-17T20:00:20.15
IV.AGST.EHN. ML:1.3 0.00010308313499999999 0.2048 AML other m 2023-10-17T20:00:19.96
IV.SSY.HNE. ML:1.5 0.000129512085 0.0896 AML other m 2023-10-17T20:00:22.50
IV.SSY.HNN. ML:1.5 0.0001275846 0.128 AML other m 2023-10-17T20:00:24.00
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