Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 28-10-2023 and time 21:33:17 (UTC) in region 2 km S Geraci Siculo (PA)

A magnitude ML 1.8 earthquake occured in region: 2 km S Geraci Siculo (PA), on

  • 28-10-2023 21:33:17 (UTC)
  • 28-10-2023 23:33:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.8420, 14.1510 at 5 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
Geraci Siculo PA 2 1945 1945
Petralia Soprana PA 6 3360 5305
Petralia Sottana PA 6 2821 8126
Gangi PA 7 6811 14937
San Mauro Castelverde PA 9 1701 16638
Bompietro PA 11 1401 18039
Castellana Sicula PA 11 3411 21450
Castelbuono PA 12 8943 30393
Blufi PA 12 1029 31422
Polizzi Generosa PA 14 3407 34829
Castel di Lucio ME 15 1294 36123
Alimena PA 17 2032 38155
Isnello PA 17 1589 39744
Pollina PA 17 2974 42718
Tusa ME 18 2925 45643
Pettineo ME 19 1350 46993
Sperlinga EN 20 805 47798

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km N of Caltanissetta (63360 inhabitants)
62 Km E of Bagheria (55387 inhabitants)
76 Km E of Palermo (674435 inhabitants)
77 Km NE of Agrigento (59770 inhabitants)
87 Km N of Gela (75827 inhabitants)
91 Km W of Catania (314555 inhabitants)
93 Km W of Acireale (52622 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 1.8 2023-10-28
21:33:17		 37.8417 14.151 5 2023-10-28
21:55:05		 Sala Sismica INGV-Roma 122524811
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-10-28 21:33:17 ± 0.14
Latitude 37.8417 ± 0.0081
Longitude 14.1510 ± 0.0102
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 122524811

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 960
Semi-minor axis of confidence ellipse (meter) 830
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 244
Circular confidence region, given by single value of horizontal uncertainty (meter) 960.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 64
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.51
Epicentral distance of station closest to the epicenter (degree) 0.12051
Epicentral distance of station farthest from the epicenter (degree) 1.00095
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.1
Num. used stations 24
Type of magnitude ML
Reference to an origin 122524811
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-10-28 21:55:05
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SSY.HHZ. 2023-10-28T21:33:37.81 1.0 undecidable manual P 133 111.0999 50 0.89 16
IV.MMGO.HHZ. 2023-10-28T21:33:36.95 0.1 undecidable manual P 259 104.9172 50 0.99 63
IV.AIO.HHZ. 2023-10-28T21:33:34.81 0.1 undecidable manual P 81 95.8263 50 0.26 83
IV.NOV.HHZ. 2023-10-28T21:33:32.94 0.1 undecidable manual P 76 88.6446 50 -0.52 79
IV.HLNI.HHZ. 2023-10-28T21:33:32.86 0.1 undecidable manual P 131 83.7495 50 0.17 87
IV.RAFF.HHZ. 2023-10-28T21:33:31.30 0.1 undecidable manual P 165 71.1732 50 0.54 81
IV.ALJA.HHZ. 2023-10-28T21:33:30.64 0.3 undecidable manual S 254 36.3414 98 0.33 69
IV.MUCR.HHZ. 2023-10-28T21:33:29.69 0.1 undecidable manual P 70 67.0773 50 -0.44 84
IV.MSFR.HHE. 2023-10-28T21:33:26.24 0.3 undecidable manual P 61 44.0226 96 -0.23 69
IV.RESU.HHZ. 2023-10-28T21:33:26.33 0.3 undecidable manual S 201 23.1546 102 0.52 67
IV.GALF.HHZ. 2023-10-28T21:33:25.79 0.1 undecidable manual P 112 39.2274 97 0.27 92
IV.PLLN.EHZ. 2023-10-28T21:33:24.49 0.3 undecidable manual S 358 16.7721 107 0.83 60
IV.GIB.HHZ. 2023-10-28T21:33:24.97 0.3 undecidable manual S 326 19.7691 104 0.3 71
IV.ALJA.HHZ. 2023-10-28T21:33:23.49 0.1 undecidable manual P 254 36.3414 98 -1.45 57
IV.CSLB.HHZ. 2023-10-28T21:33:22.66 0.3 undecidable manual S 323 13.3755 110 0.1 75
IV.RESU.HHZ. 2023-10-28T21:33:21.46 0.1 undecidable manual P 201 23.1546 102 -0.88 77
IV.PLLN.EHZ. 2023-10-28T21:33:21.16 0.1 positive manual P 358 16.7721 107 0.06 100
IV.GIB.HHZ. 2023-10-28T21:33:21.22 0.1 undecidable manual P 326 19.7691 104 -0.46 91
IV.CSLB.HHZ. 2023-10-28T21:33:20.11 0.1 undecidable manual P 323 13.3755 110 -0.35 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSLB.HNN. ML:1.6 0.0005909999999999999 0.5 AML other m 2023-10-28T21:33:23.26
IV.CSLB.HHN. ML:1.6 0.000561 0.5 AML other m 2023-10-28T21:33:23.27
IV.CSLB.HNE. ML:1.6 0.0005425 1.14 AML other m 2023-10-28T21:33:24.14
IV.CSLB.HHE. ML:1.6 0.0005495 1.14 AML other m 2023-10-28T21:33:24.15
IV.RESU.HNN. ML:1.8 0.0003875 1.34 AML other m 2023-10-28T21:33:27.71
IV.PLLN.EHN. ML:1.9 0.0008810000000000001 0.3 AML other m 2023-10-28T21:33:27.85
IV.GIB.HHE. ML:1.9 0.0006885 0.26 AML other m 2023-10-28T21:33:27.73
IV.RESU.HHN. ML:2.1 0.000801 1.34 AML other m 2023-10-28T21:33:28.71
IV.PLLN.EHE. ML:1.7 0.000528 0.92 AML other m 2023-10-28T21:33:28.65
IV.GIB.HHN. ML:1.9 0.0006590000000000001 0.94 AML other m 2023-10-28T21:33:28.06
IV.RESU.HHE. ML:2.0 0.0007804999999999999 0.38 AML other m 2023-10-28T21:33:29.94
IV.RESU.HNE. ML:1.8 0.00040100000000000004 0.38 AML other m 2023-10-28T21:33:29.94
IV.ALJA.HHE. ML:1.9 0.0003375 0.42 AML other m 2023-10-28T21:33:31.45
IV.ALJA.HHN. ML:1.9 0.00029549999999999997 1.34 AML other m 2023-10-28T21:33:32.30
IV.GALF.HNN. ML:1.6 0.000161 0.76 AML other m 2023-10-28T21:33:40.45
IV.GALF.HHN. ML:2.0 0.00032499999999999993 0.8 AML other m 2023-10-28T21:33:40.46
IV.GALF.HHE. ML:1.9 0.00028100000000000005 0.6 AML other m 2023-10-28T21:33:42.18
IV.GALF.HNE. ML:1.7 0.00017199999999999998 0.58 AML other m 2023-10-28T21:33:42.19
IV.NOV.HHN. ML:1.8 0.00007835000000000001 1.36 AML other m 2023-10-28T21:33:53.16
IV.MMGO.HNN. ML:1.6 0.000041769999999999995 1.16 AML other m 2023-10-28T21:33:55.16
IV.NOV.HHE. ML:1.8 0.00008044999999999999 1.22 AML other m 2023-10-28T21:33:56.89
IV.AIO.HHN. ML:1.7 0.00004865 0.82 AML other m 2023-10-28T21:33:56.86
IV.MMGO.HNE. ML:1.6 0.00004246 0.46 AML other m 2023-10-28T21:33:59.02
IV.AIO.HHE. ML:1.6 0.00004435 0.72 AML other m 2023-10-28T21:33:59.78
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