Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.4 on date 01-06-2021 and time 01:45:47 (Italy) in region 5 km NE Polizzi Generosa (PA)

A magnitude ML 0.4 earthquake occured in region: 5 km NE Polizzi Generosa (PA), on

  • 31-05-2021 23:45:47 (UTC)
  • 01-06-2021 01:45:47 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.8380, 14.0460 at 10 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Polizzi Generosa PA 5 3407 3407
Petralia Sottana PA 5 2821 6228
Castellana Sicula PA 6 3411 9639
Petralia Soprana PA 7 3360 12999
Blufi PA 10 1029 14028
Geraci Siculo PA 10 1945 15973
Bompietro PA 11 1401 17374
Castelbuono PA 11 8943 26317
Scillato PA 12 613 26930
Isnello PA 12 1589 28519
Collesano PA 13 4054 32573
Caltavuturo PA 14 4017 36590
Gangi PA 15 6811 43401
San Mauro Castelverde PA 15 1701 45102
Gratteri PA 16 963 46065
Sclafani Bagni PA 17 426 46491
Alimena PA 17 2032 48523
Resuttano CL 18 2038 50561
Pollina PA 20 2974 53535

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km N of Caltanissetta (63360 inhabitants)
54 Km SE of Bagheria (55387 inhabitants)
67 Km E of Palermo (674435 inhabitants)
71 Km NE of Agrigento (59770 inhabitants)
88 Km N of Gela (75827 inhabitants)
99 Km W of Catania (314555 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
Bulletin
Rev1000 		ML 0.4 2021-05-31
23:45:47		 37.8383 14.0462 10 2021-12-29
11:12:06		 Bollettino Sismico Italiano INGV 91768071
Reviewed
Rev100 		ML 0.3 2021-05-31
23:45:48		 37.8167 14.0208 5 2021-06-01
00:01:25		 Sala Sismica INGV-Roma 90672311
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-05-31 23:45:47 ± 0.24
Latitude 37.8383 ± 0.0045
Longitude 14.0462 ± 0.0216
Depth (km) 10 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 91768071

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1756
Semi-minor axis of confidence ellipse (meter) 724
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 83
Circular confidence region, given by single value of horizontal uncertainty (meter) 1760.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 177
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.19156
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 5
Magnitudes information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.2
Num. used stations 7
Type of magnitude ML
Reference to an origin 91768071
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-14 13:01:30

ML:0.3

Field Value
Value 0.3
Uncertainty 0.2
Num. used stations 5
Type of magnitude ML
Reference to an origin 90672311
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-06-01 00:01:25
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RESU.HHZ. 2021-05-31T23:45:56.48 0.6 undecidable manual S 177 21.2676 116 0.36 47
IV.GIB.HHZ. 2021-05-31T23:45:54.57 0.6 undecidable manual S 354 16.9719 122 -0.23 49
IV.CSLB.HHZ. 2021-05-31T23:45:53.37 0.3 undecidable manual S 5 11.0778 133 0.2 74
IV.RESU.HHZ. 2021-05-31T23:45:52.38 0.3 undecidable manual P 177 21.2676 116 -0.26 72
IV.PLLN.EHE. 2021-05-31T23:45:52.44 0.3 undecidable manual P 26 19.0698 119 0.18 73
IV.GIB.HHZ. 2021-05-31T23:45:51.98 0.1 undecidable manual P 354 16.9719 122 0.09 100
IV.PETRA.HHZ. 2021-05-31T23:45:51.92 0.6 undecidable manual S 95 5.994 150 -0.16 50
IV.PETRA.HHZ. 2021-05-31T23:45:50.31 0.3 undecidable manual P 95 5.994 150 0 78
IV.CSLB.HHZ. 2021-05-31T23:45:50.80 0.1 undecidable manual P 5 11.0778 133 -0.14 100
IV.MILZ.HHZ. 2021-05-31T23:45:42.17 3.0 undecidable manual P -0.01 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSLB.HHE. ML:0.1 0.0000152239 0.256 AML other m 2021-05-31T23:45:54.59
IV.CSLB.HHN. ML:0.3 0.0000243 0.4 AML other m 2021-05-31T23:45:54.41
IV.PETRA.HHE. ML:0.7 0.000080334265 0.5248 AML other m 2021-05-31T23:45:55.53
IV.GIB.HHE. ML:0.6 0.000027766695 0.2944 AML other m 2021-05-31T23:45:56.77
IV.PETRA.HHN. ML:0.6 0.00005745 1.18 AML other m 2021-05-31T23:45:57.79
IV.RESU.HHE. ML:0.3 0.00001553755 1.3984 AML other m 2021-05-31T23:45:59.85
IV.RESU.HHN. ML:0.5 0.000017802985 0.5248 AML other m 2021-05-31T23:46:03.01
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