Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 21-10-2021 and time 00:25:37 (Italy) in region Costa Siciliana centro settentrionale (Palermo)

A magnitude ML 1.2 earthquake occured in region: Costa Siciliana centro settentrionale (Palermo), on

  • 20-10-2021 22:25:37 (UTC)
  • 21-10-2021 00:25:37 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 38.0950, 13.8980 at 10 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
Lascari PA 11 3588 3588
Campofelice di Roccella PA 11 7537 11125
Cefalù PA 12 14393 25518
Gratteri PA 16 963 26481
Isnello PA 19 1589 28070
Collesano PA 20 4054 32124

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km E of Bagheria (55387 inhabitants)
47 Km E of Palermo (674435 inhabitants)
68 Km N of Caltanissetta (63360 inhabitants)
91 Km N 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 1.2 2021-10-20
22:25:37		 38.095 13.8983 10 2021-10-20
22:30:40		 Sala Sismica INGV-Roma 96813121
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-20 22:25:37 ± 0.2
Latitude 38.0950 ± 0.0153
Longitude 13.8983 ± 0.0091
Depth (km) 10 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96813121

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1689
Semi-minor axis of confidence ellipse (meter) 746
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 170
Circular confidence region, given by single value of horizontal uncertainty (meter) 1690.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 81
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.14479
Epicentral distance of station farthest from the epicenter (degree) 0.83187
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 96813121
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-20 22:30:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.USI.HHE. 2021-10-20T22:25:53.15 0.3 undecidable manual P 318 92.3409 50 -0.03 67
IV.MCPD.HHE. 2021-10-20T22:25:50.67 0.6 undecidable manual P 88 72.7716 50 0.52 41
IV.MSFR.HHE. 2021-10-20T22:25:48.57 0.6 undecidable manual P 96 60.8946 50 0.24 45
IV.SOLUN.HHZ. 2021-10-20T22:25:48.11 0.3 undecidable manual S 269 31.9458 50 -0.55 66
IV.IACL.HHZ. 2021-10-20T22:25:48.79 0.6 undecidable manual P 39 62.7927 50 0.17 46
IV.MPG.HHE. 2021-10-20T22:25:46.85 1.0 undecidable manual P 279 47.5191 50 0.58 21
IV.CSLB.HHZ. 2021-10-20T22:25:45.41 0.3 undecidable manual S 141 22.3554 113 -0.34 71
IV.ALJA.HHZ. 2021-10-20T22:25:45.57 0.6 undecidable manual P 198 40.4262 50 0.4 45
IV.SCIAR.HHZ. 2021-10-20T22:25:45.88 0.3 undecidable manual S 217 21.5673 114 0.4 70
IV.GIB.HHZ. 2021-10-20T22:25:44.01 0.3 undecidable manual S 136 16.0728 120 0.2 74
IV.SOLUN.HHZ. 2021-10-20T22:25:43.68 0.6 negative manual P 269 31.9458 50 -0.19 48
IV.SCIAR.HHZ. 2021-10-20T22:25:42.12 0.1 negative manual P 217 21.5673 114 0.09 100
IV.CSLB.HHZ. 2021-10-20T22:25:41.60 0.3 undecidable manual P 141 22.3554 113 -0.58 67
IV.GIB.HHZ. 2021-10-20T22:25:40.92 0.1 negative manual P 136 16.0728 120 -0.14 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GIB.HHN. ML:1.1 0.000127 0.6 AML other m 2021-10-20T22:25:44.56
IV.GIB.HHE. ML:1.4 0.0002465 0.54 AML other m 2021-10-20T22:25:46.50
IV.CSLB.HHN. ML:0.9 0.000053400000000000004 0.64 AML other m 2021-10-20T22:25:46.60
IV.CSLB.HHE. ML:1.0 0.00005964999999999999 1.34 AML other m 2021-10-20T22:25:46.07
IV.SCIAR.HHN. ML:1.1 0.0000974 0.74 AML other m 2021-10-20T22:25:46.83
IV.SCIAR.HHE. ML:1.4 0.000153 1.22 AML other m 2021-10-20T22:25:46.92
IV.ALJA.HHN. ML:1.2 0.000049000000000000005 0.64 AML other m 2021-10-20T22:25:54.38
IV.ALJA.HHE. ML:1.5 0.00010120000000000001 0.94 AML other m 2021-10-20T22:25:54.51
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