Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 31-05-2020 and time 09:30:37 (Italy) in region 3 km NW Polizzi Generosa (PA)

A magnitude ML 1.1 earthquake occured in region: 3 km NW Polizzi Generosa (PA), on

  • 31-05-2020 07:30:37 (UTC)
  • 31-05-2020 09:30:37 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.8410, 13.9860 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
Polizzi Generosa PA 3 3407 3407
Scillato PA 7 613 4020
Castellana Sicula PA 8 3411 7431
Caltavuturo PA 9 4017 11448
Collesano PA 10 4054 15502
Petralia Sottana PA 10 2821 18323
Sclafani Bagni PA 12 426 18749
Isnello PA 12 1589 20338
Petralia Soprana PA 12 3360 23698
Blufi PA 13 1029 24727
Castelbuono PA 14 8943 33670
Gratteri PA 14 963 34633
Bompietro PA 14 1401 36034
Geraci Siculo PA 15 1945 37979
Cerda PA 17 5330 43309
Valledolmo PA 17 3594 46903
Aliminusa PA 18 1236 48139
Resuttano CL 18 2038 50177
Lascari PA 18 3588 53765
Campofelice di Roccella PA 19 7537 61302
Montemaggiore Belsito PA 20 3365 64667
San Mauro Castelverde PA 20 1701 66368
Alimena PA 20 2032 68400
Gangi PA 20 6811 75211

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km N of Caltanissetta (63360 inhabitants)
49 Km SE of Bagheria (55387 inhabitants)
63 Km SE of Palermo (674435 inhabitants)
69 Km NE of Agrigento (59770 inhabitants)
89 Km N of Gela (75827 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 2020-05-31
07:30:37		 37.841 13.9862 21 2020-05-31
07:39:22		 Sala Sismica INGV-Roma 79744021
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-05-31 07:30:37 ± 0.25
Latitude 37.8410 ± 0.0072
Longitude 13.9862 ± 0.0148
Depth (km) 21 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 79744021

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 989
Semi-minor axis of confidence ellipse (meter) 967
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 241
Circular confidence region, given by single value of horizontal uncertainty (meter) 990.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 134
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) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.10162
Epicentral distance of station farthest from the epicenter (degree) 0.21134
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 79744021
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-05-31 07:39:22
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RESU.HHZ. 2020-05-31T07:30:46.83 0.3 undecidable manual S 164 22.4553 125 0.22 72
IV.SCIAR.HHZ. 2020-05-31T07:30:46.99 0.3 undecidable manual S 298 23.4543 124 0.14 72
IV.GIB.HHZ. 2020-05-31T07:30:45.81 0.3 undecidable manual S 12 16.872 135 0.34 72
IV.PETRA.HHZ. 2020-05-31T07:30:44.31 0.3 undecidable manual S 94 11.2776 147 -0.21 73
IV.CSLB.HHZ. 2020-05-31T07:30:44.67 0.3 undecidable manual S 30 12.3765 144 -0.02 76
IV.GIB.HHZ. 2020-05-31T07:30:42.44 0.6 undecidable manual P 12 16.872 135 0.44 47
IV.RESU.HHZ. 2020-05-31T07:30:42.81 0.3 undecidable manual P 164 22.4553 125 0.15 73
IV.PLLN.EHZ. 2020-05-31T07:30:42.64 0.1 undecidable manual P 39 21.6672 126 0.07 100
IV.SCIAR.HHZ. 2020-05-31T07:30:42.31 0.3 undecidable manual P 298 23.4543 124 -0.49 69
IV.PETRA.HHZ. 2020-05-31T07:30:41.28 0.1 undecidable manual P 94 11.2776 147 -0.18 99
IV.CSLB.HHZ. 2020-05-31T07:30:41.33 0.1 undecidable manual P 30 12.3765 144 -0.22 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PETRA.HHN. ML:1.2 0.00011399999999999999 0.34 AML other m 2020-05-31T07:30:44.79
IV.CSLB.HHE. ML:0.8 0.0000422 0.74 AML other m 2020-05-31T07:30:45.47
IV.PETRA.HHE. ML:1.1 0.0000891 0.46 AML other m 2020-05-31T07:30:45.71
IV.CSLB.HHN. ML:0.9 0.00005555 0.46 AML other m 2020-05-31T07:30:46.54
IV.SCIAR.HHE. ML:1.0 0.00005385 0.28 AML other m 2020-05-31T07:30:47.87
IV.SCIAR.HHN. ML:1.0 0.000055599999999999996 1.8 AML other m 2020-05-31T07:30:48.02
IV.RESU.HHE. ML:1.2 0.0000857 0.6 AML other m 2020-05-31T07:30:48.81
IV.RESU.HHN. ML:1.3 0.00009675000000000001 0.56 AML other m 2020-05-31T07:30:49.34
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