Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 31-01-2021 and time 21:49:47 (Italy) in region 5 km E Geraci Siculo (PA)

A magnitude ML 1.4 earthquake occured in region: 5 km E Geraci Siculo (PA), on

  • 31-01-2021 20:49:47 (UTC)
  • 31-01-2021 21:49:47 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.8500, 14.2110 at 9 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
Geraci Siculo PA 5 1945 1945
Gangi PA 6 6811 8756
San Mauro Castelverde PA 8 1701 10457
Castel di Lucio ME 10 1294 11751
Petralia Soprana PA 11 3360 15111
Petralia Sottana PA 11 2821 17932
Castelbuono PA 14 8943 26875
Pettineo ME 15 1350 28225
Bompietro PA 15 1401 29626
Tusa ME 15 2925 32551
Sperlinga EN 16 805 33356
Blufi PA 16 1029 34385
Mistretta ME 16 4791 39176
Castellana Sicula PA 16 3411 42587
Motta d'Affermo ME 17 739 43326
Pollina PA 17 2974 46300
Reitano ME 18 806 47106
Polizzi Generosa PA 19 3407 50513
Alimena PA 19 2032 52545
Nicosia EN 20 13899 66444

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km NE of Caltanissetta (63360 inhabitants)
66 Km E of Bagheria (55387 inhabitants)
80 Km E of Palermo (674435 inhabitants)
82 Km NE of Agrigento (59770 inhabitants)
86 Km W of Catania (314555 inhabitants)
87 Km N of Gela (75827 inhabitants)
88 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
Bulletin
Rev1000 		ML 1.4 2021-01-31
20:49:47		 37.8503 14.2112 9 2021-07-12
16:55:03		 Bollettino Sismico Italiano INGV 88425961
Reviewed
Rev100 		ML 2.0 2021-01-31
20:49:46		 37.8602 14.1912 10 2021-01-31
20:58:56		 Sala Sismica INGV-Roma 86743651
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-31 20:49:47 ± 0.12
Latitude 37.8503 ± 0.0081
Longitude 14.2112 ± 0.0171
Depth (km) 9 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 88425961

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1432
Semi-minor axis of confidence ellipse (meter) 879
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 274
Circular confidence region, given by single value of horizontal uncertainty (meter) 1430.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 79
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0.07824
Epicentral distance of station farthest from the epicenter (degree) 0.55668
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 86743651
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-31 20:58:56

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 88425961
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-03-29 14:44:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MSFR.HHZ. 2021-01-31T20:50:00.58 0.6 undecidable manual S 58 39.0276 50 0.08 48
IV.MUCR.HHZ. 2021-01-31T20:49:58.01 0.3 undecidable manual P 70 61.7937 50 -0.36 65
IV.GALF.HHZ. 2021-01-31T20:49:58.97 0.6 undecidable manual S 116 34.8429 50 -0.4 45
IV.RESU.HHZ. 2021-01-31T20:49:56.12 0.6 undecidable manual S 211 26.3514 109 -0.7 41
IV.CAGR.HHZ. 2021-01-31T20:49:55.32 0.3 undecidable manual P 135 35.8419 50 0.95 55
IV.SCIAR.HHZ. 2021-01-31T20:49:55.37 0.3 undecidable manual P 284 41.625 50 0.1 71
IV.GALF.HHZ. 2021-01-31T20:49:54.41 0.3 undecidable manual P 116 34.8429 50 0.2 70
IV.MSFR.HHZ. 2021-01-31T20:49:54.42 0.3 undecidable manual P 58 39.0276 50 -0.44 66
IV.PLLN.EHZ. 2021-01-31T20:49:54.36 0.6 undecidable manual S 339 16.872 118 0.56 44
IV.RESU.HHZ. 2021-01-31T20:49:53.23 0.3 undecidable manual P 211 26.3514 109 0.49 67
IV.CSLB.HHZ. 2021-01-31T20:49:53.60 0.6 undecidable manual S 306 16.5723 119 -0.1 49
IV.PLLN.EHZ. 2021-01-31T20:49:51.04 0.1 undecidable manual P 339 16.872 118 0.04 100
IV.PETRA.HHZ. 2021-01-31T20:49:51.58 0.6 undecidable manual S 258 8.6802 136 0.08 50
IV.CSLB.HHZ. 2021-01-31T20:49:50.68 0.1 undecidable manual P 306 16.5723 119 -0.26 96
IV.PETRA.HHZ. 2021-01-31T20:49:49.54 0.1 undecidable manual P 258 8.6802 136 -0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PETRA.HHN. ML:1.1 0.000187746875 0.2816 AML other m 2021-01-31T20:49:51.59
IV.PETRA.HHE. ML:1.8 0.00088837985 0.1536 AML other m 2021-01-31T20:49:51.73
IV.CSLB.HHN. ML:1.2 0.000136818945 0.4224 AML other m 2021-01-31T20:49:53.75
IV.PLLN.EHN. ML:1.4 0.000243125131 0.256 AML other m 2021-01-31T20:49:53.59
IV.PLLN.EHE. ML:1.2 0.00012848113 0.1408 AML other m 2021-01-31T20:49:53.84
IV.CSLB.HHE. ML:1.6 0.0003705775 0.4992 AML other m 2021-01-31T20:49:54.02
IV.RESU.HHE. ML:1.4 0.0001312759 0.3968 AML other m 2021-01-31T20:49:56.53
IV.RESU.HHN. ML:1.5 0.0001677968 0.3712 AML other m 2021-01-31T20:49:56.55
IV.GALF.HHN. ML:1.9 0.00031482695000000004 0.3968 AML other m 2021-01-31T20:49:59.23
IV.GALF.HNN. ML:1.2 0.00006140901 0.3712 AML other m 2021-01-31T20:49:59.21
IV.GALF.HNE. ML:1.1 0.000054468965 0.3584 AML other m 2021-01-31T20:49:59.35
IV.GALF.HHE. ML:1.8 0.00026202784999999993 0.8448 AML other m 2021-01-31T20:49:59.17
IV.MSFR.HHN. ML:1.4 0.00010203719 0.32 AML other m 2021-01-31T20:50:01.06
IV.MSFR.HHE. ML:1.5 0.0001157182 0.2432 AML other m 2021-01-31T20:50:01.11
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
Waveforms Seismic signals in miniseed + resp format Download