Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 31-10-2023 and time 03:26:54 (UTC) in region 6 km W Ramacca (CT)

A magnitude ML 1.6 earthquake occured in region: 6 km W Ramacca (CT), on

  • 31-10-2023 03:26:54 (UTC)
  • 31-10-2023 04:26:54 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.4020, 14.6240 at 40 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
Ramacca CT 7 10894 10894
Castel di Iudica CT 11 4625 15519
Raddusa CT 11 3178 18697
Palagonia CT 14 16608 35305
Aidone EN 16 4889 40194
Mineo CT 16 5159 45353
Mirabella Imbaccari CT 18 4912 50265
Catenanuova EN 20 4866 55131

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km W of Catania (314555 inhabitants)
50 Km NE of Gela (75827 inhabitants)
51 Km E of Caltanissetta (63360 inhabitants)
51 Km N of Vittoria (63339 inhabitants)
53 Km W of Acireale (52622 inhabitants)
54 Km N of Ragusa (73313 inhabitants)
62 Km N of Modica (54633 inhabitants)
70 Km NW of Siracusa (122291 inhabitants)
92 Km E of Agrigento (59770 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 1.6 2023-10-31
03:26:54		 37.4018 14.624 41 2023-10-31
03:34:37		 Sala Sismica INGV-Roma 122601191
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-10-31 03:26:54 ± 0.25
Latitude 37.4018 ± 0.0108
Longitude 14.6240 ± 0.0226
Depth (km) 41 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 122601191

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1674
Semi-minor axis of confidence ellipse (meter) 1306
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 68
Circular confidence region, given by single value of horizontal uncertainty (meter) 1670.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 123
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.66010
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 122601191
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-10-31 03:34:37
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HMDC.HHZ. 2023-10-31T03:27:13.42 0.6 undecidable manual S 164 51.1155 105 0.13 48
IV.GALF.HHE. 2023-10-31T03:27:10.48 0.6 undecidable manual S 352 34.6431 124 0.42 46
IV.HLNI.HHZ. 2023-10-31T03:27:08.26 0.6 undecidable manual S 105 22.6551 141 0.11 51
IV.ISPIC.HHZ. 2023-10-31T03:27:08.46 0.3 undecidable manual P 160 73.2711 95 0.2 67
IV.HVZN.HHZ. 2023-10-31T03:27:08.68 0.3 undecidable manual S 162 26.0517 136 0.04 76
IV.ACATE.EHE. 2023-10-31T03:27:05.27 0.6 undecidable manual P 195 43.3233 113 0.65 42
IV.HMDC.HHZ. 2023-10-31T03:27:05.32 0.3 negative manual P 164 51.1155 105 -0.22 71
IV.GALF.HHE. 2023-10-31T03:27:03.50 0.3 undecidable manual P 352 34.6431 124 -0.18 74
IV.RAFF.HHE. 2023-10-31T03:27:03.04 0.6 undecidable manual P 229 30.4473 129 -0.22 49
IV.HLNI.HHZ. 2023-10-31T03:27:02.42 0.1 undecidable manual P 105 22.6551 141 -0.15 100
IV.HVZN.HHZ. 2023-10-31T03:27:02.47 0.3 negative manual P 162 26.0517 136 -0.39 71
7C.SPAOL.HNZ. 2023-10-31T03:26:56.92 3.0 undecidable manual P 0 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HLNI.HHN. ML:1.5 0.00009155 0.22 AML other m 2023-10-31T03:27:08.64
IV.HLNI.HHE. ML:1.6 0.00011619999999999999 0.48 AML other m 2023-10-31T03:27:09.50
IV.HLNI.HNE. ML:1.7 0.000137131795 1.5104 AML other m 2023-10-31T03:27:08.50
IV.HLNI.HNN. ML:1.5 0.00009790141000000001 0.2304 AML other m 2023-10-31T03:27:08.64
IV.HVZN.HHE. ML:1.4 0.0000702736885 0.8192 AML other m 2023-10-31T03:27:08.97
IV.HVZN.HHN. ML:1.5 0.000087039375 1.28 AML other m 2023-10-31T03:27:08.87
IV.HMDC.HHE. ML:1.8 0.00010953729499999999 0.1392 AML other m 2023-10-31T03:27:13.81
IV.ISPIC.HHE. ML:1.9 0.0001082763 0.1408 AML other m 2023-10-31T03:27:19.56
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