Earthquake with magnitude of ML 1.7 on date 21-10-2021 and time 23:27:46 (UTC) in region 4 km NE Gangi (PA)

A magnitude ML 1.7 earthquake occured in region: 4 km NE Gangi (PA), on

  • 21-10-2021 23:27:46 (UTC)
  • 22-10-2021 01:27:46 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.832, 14.23 at 8 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Gangi PA 4 6811 6811
Geraci Siculo PA 7 1945 8756
Castel di Lucio ME 10 1294 10050
San Mauro Castelverde PA 10 1701 11751
Petralia Soprana PA 11 3360 15111
Petralia Sottana PA 12 2821 17932
Sperlinga EN 13 805 18737
Bompietro PA 15 1401 20138
Blufi PA 16 1029 21167
Pettineo ME 16 1350 22517
Mistretta ME 16 4791 27308
Castelbuono PA 17 8943 36251
Tusa ME 17 2925 39176
Castellana Sicula PA 17 3411 42587
Nicosia EN 18 13899 56486
Motta d'Affermo ME 18 739 57225
Alimena PA 18 2032 59257
Reitano ME 19 806 60063
Pollina PA 20 2974 63037

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km NE of Caltanissetta (63360 inhabitants)
69 Km E of Bagheria (55387 inhabitants)
81 Km NE of Agrigento (59770 inhabitants)
82 Km E of Palermo (674435 inhabitants)
84 Km W of Catania (314555 inhabitants)
85 Km N of Gela (75827 inhabitants)
86 Km W of Acireale (52622 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.7 2021-10-21
23:27:46
37.8318 14.2295 8 2021-10-21
23:41:46
Sala Sismica INGV-Roma 96860431
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-21 23:27:46 ± 0.12
Latitude 37.8318 ± 0.0072
Longitude 14.2295 ± 0.0080
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96860431

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 778
Semi-minor axis of confidence ellipse (meter) 570
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 344
Circular confidence region, given by single value of horizontal uncertainty (meter) 780
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 107
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.17177
Epicentral distance of station farthest from the epicenter (degree) 0.55038
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 96860431
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-21 23:41:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MSFR.HHE. 2021-10-21T23:28:00.14 0.6 undecidable manual S 55 0.3498 50 0.03 67
IV.MUCR.HHZ. 2021-10-21T23:27:58.26 0.6 undecidable manual P 67 0.5504 50 0.45 59
IV.GALF.HHZ. 2021-10-21T23:27:58.34 0.6 undecidable manual S 114 0.2923 103 0.22 65
IV.RESU.HHZ. 2021-10-21T23:27:55.98 0.3 undecidable manual S 216 0.2302 107 0.18 100
MN.VAE.HHE. 2021-10-21T23:27:55.34 0.6 undecidable manual P 165 0.3759 50 0.52 60
IV.CSLB.HHZ. 2021-10-21T23:27:54.01 0.3 undecidable manual S 308 0.1718 112 0.33 98
IV.MSFR.HHE. 2021-10-21T23:27:54.07 0.3 undecidable manual P 55 0.3498 50 -0.31 95
IV.ALJA.HHZ. 2021-10-21T23:27:54.82 0.3 undecidable manual P 258 0.3849 50 -0.16 97
IV.GALF.HHZ. 2021-10-21T23:27:52.86 0.6 undecidable manual P 114 0.2923 103 -0.37 63
IV.RESU.HHZ. 2021-10-21T23:27:51.50 0.3 undecidable manual P 216 0.2302 107 -0.39 96
IV.CSLB.HHZ. 2021-10-21T23:27:50.34 0.6 negative manual P 308 0.1718 112 -0.32 65
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSLB.HHN. ML:1.4 0.0001975 0.8 AML other m 2021-10-21T23:27:56.52
IV.CSLB.HHE. ML:1.2 0.0001205 0.22 AML other m 2021-10-21T23:27:58.42
IV.RESU.HHN. ML:2 0.0005475 1.42 AML other m 2021-10-21T23:28:00.10
IV.RESU.HHE. ML:1.7 0.0003325 0.9 AML other m 2021-10-21T23:28:02.40
IV.GALF.HHN. ML:2 0.0004885 0.84 AML other m 2021-10-21T23:28:03.40
IV.ALJA.HHE. ML:1.6 0.0001335 0.32 AML other m 2021-10-21T23:28:05.22
IV.GALF.HHE. ML:2.1 0.0005785 0.56 AML other m 2021-10-21T23:28:05.87
IV.ALJA.HHN. ML:1.5 9.68E-5 0.9 AML other m 2021-10-21T23:28:05.23
IV.MUCR.HHE. ML:1.5 6.27E-5 0.32 AML other m 2021-10-21T23:28:11.46
IV.MUCR.HHN. ML:1.7 9.82E-5 1.68 AML other m 2021-10-21T23:28:12.05
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