Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 11-10-2023 and time 19:00:19 (UTC) in region 5 km E Ragusa (RG)

A magnitude ML 1.1 earthquake occured in region: 5 km E Ragusa (RG), on

  • 11-10-2023 19:00:19 (UTC)
  • 11-10-2023 21:00:19 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 36.9440, 14.7820 at 21 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
Ragusa RG 5 73313 73313
Modica RG 10 54633 127946
Giarratana RG 12 3048 130994
Chiaramonte Gulfi RG 12 8238 139232
Comiso RG 16 30156 169388
Monterosso Almo RG 16 3032 172420
Palazzolo Acreide SR 17 8808 181228
Scicli RG 18 27077 208305
Buscemi SR 18 1051 209356

Municipalities with at least 50000 inhabitants

An earthquake occurred to
5 Km E of Ragusa (73313 inhabitants)
10 Km N of Modica (54633 inhabitants)
22 Km E of Vittoria (63339 inhabitants)
47 Km W of Siracusa (122291 inhabitants)
49 Km E of Gela (75827 inhabitants)
68 Km SW of Catania (314555 inhabitants)
82 Km SW of Acireale (52622 inhabitants)
88 Km SE of Caltanissetta (63360 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 1.1 2023-10-11
19:00:19		 36.9443 14.7818 21 2023-10-11
19:13:43		 Sala Sismica INGV-Roma 121992021
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-10-11 19:00:19 ± 0.1
Latitude 36.9443 ± 0.0045
Longitude 14.7818 ± 0.0045
Depth (km) 21 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121992021

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 463
Semi-minor axis of confidence ellipse (meter) 214
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 357
Circular confidence region, given by single value of horizontal uncertainty (meter) 460.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 72
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) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.01439
Epicentral distance of station farthest from the epicenter (degree) 0.41009
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:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 121992021
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-10-11 19:13:43
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HLNI.HHZ. 2023-10-11T19:00:35.04 0.3 undecidable manual S 10 45.5211 107 0.07 71
IV.SSY.HHZ. 2023-10-11T19:00:32.61 0.3 undecidable manual S 47 35.0427 113 0.28 69
IV.HPAC.HHE. 2023-10-11T19:00:32.27 0.3 undecidable manual S 139 34.6431 113 0.05 73
IV.HAVL.HHZ. 2023-10-11T19:00:30.80 0.3 undecidable manual S 87 30.2475 117 -0.36 70
IV.HVIT.HHE. 2023-10-11T19:00:29.20 0.3 undecidable manual S 283 23.6541 125 -0.45 68
IV.SCIC.HHE. 2023-10-11T19:00:28.92 0.3 undecidable manual S 211 19.0698 132 0.23 73
IV.HLNI.HHZ. 2023-10-11T19:00:28.65 0.6 positive manual P 10 45.5211 107 0.03 48
IV.SSY.HHZ. 2023-10-11T19:00:27.07 0.6 positive manual P 47 35.0427 113 -0.03 49
IV.HPAC.HHE. 2023-10-11T19:00:26.97 0.1 undecidable manual P 139 34.6431 113 -0.07 97
IV.HAVL.HHZ. 2023-10-11T19:00:26.18 0.1 positive manual P 87 30.2475 117 -0.24 95
IV.HMDC.HHZ. 2023-10-11T19:00:26.50 0.3 undecidable manual S 4 1.5984 175 0 77
IV.HVZN.HHZ. 2023-10-11T19:00:26.15 0.6 positive manual P 347 26.6511 121 0.21 48
IV.CROCE.HHZ. 2023-10-11T19:00:25.80 0.1 positive manual P 241 25.1526 123 0.05 100
IV.HVIT.HHE. 2023-10-11T19:00:25.67 0.1 undecidable manual P 283 23.6541 125 0.12 99
IV.SCIC.HHE. 2023-10-11T19:00:25.09 0.1 undecidable manual P 211 19.0698 132 0.1 100
IV.HMDC.HHZ. 2023-10-11T19:00:23.69 1.0 undecidable manual P 4 1.5984 175 -0.05 26
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HMDC.HHE. ML:1.0 0.00008165261499999999 0.0768 AML other m 2023-10-11T19:00:26.67
IV.HMDC.HHN. ML:1.0 0.000085653205 0.1408 AML other m 2023-10-11T19:00:27.67
IV.CROCE.HHN. ML:0.7 0.000025500000000000003 0.1 AML other m 2023-10-11T19:00:30.53
IV.HAVL.HHN. ML:1.2 0.000062661455 0.2816 AML other m 2023-10-11T19:00:31.75
IV.HAVL.HHE. ML:1.3 0.00007535 0.22 AML other m 2023-10-11T19:00:31.17
IV.CROCE.HHE. ML:0.7 0.00002384689 0.256 AML other m 2023-10-11T19:00:30.40
IV.SSY.HHE. ML:1.2 0.00005895335 0.1792 AML other m 2023-10-11T19:00:32.77
IV.SSY.HHN. ML:1.2 0.000058213550000000004 0.128 AML other m 2023-10-11T19:00:32.90
IV.HLNI.HHE. ML:1.0 0.000031059605 0.3072 AML other m 2023-10-11T19:00:35.61
IV.HLNI.HHN. ML:1.0 0.000024932389999999998 0.2432 AML other m 2023-10-11T19:00:35.85
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