Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 24-04-2020 and time 14:56:52 (Italy) in region 4 km SW Blufi (PA)

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

  • 24-04-2020 12:56:52 (UTC)
  • 24-04-2020 14:56:52 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.7200, 14.0580 at 37 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
Blufi PA 4 1029 1029
Resuttano CL 5 2038 3067
Bompietro PA 5 1401 4468
Alimena PA 6 2032 6500
Castellana Sicula PA 7 3411 9911
Petralia Soprana PA 10 3360 13271
Petralia Sottana PA 10 2821 16092
Polizzi Generosa PA 12 3407 19499
Santa Caterina Villarmosa CL 14 5388 24887
Gangi PA 16 6811 31698
Villarosa EN 18 4937 36635
Geraci Siculo PA 18 1945 38580
Marianopoli CL 18 1906 40486
Caltavuturo PA 19 4017 44503

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km N of Caltanissetta (63360 inhabitants)
62 Km NE of Agrigento (59770 inhabitants)
63 Km SE of Bagheria (55387 inhabitants)
75 Km N of Gela (75827 inhabitants)
75 Km SE of Palermo (674435 inhabitants)
94 Km W of Catania (314555 inhabitants)
96 Km NW of Vittoria (63339 inhabitants)
98 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 1.7 2020-04-24
12:56:52		 37.7195 14.058 37 2020-07-18
21:08:38		 Bollettino Sismico Italiano INGV 79659271
Reviewed
Rev100 		ML 1.7 2020-04-24
12:56:52		 37.7212 14.0232 39 2020-04-24
13:08:35		 Sala Sismica INGV-Roma 78533341
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-04-24 12:56:52 ± 0.16
Latitude 37.7195 ± 0.0090
Longitude 14.0580 ± 0.0159
Depth (km) 37 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 79659271

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1153
Semi-minor axis of confidence ellipse (meter) 1088
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 255
Circular confidence region, given by single value of horizontal uncertainty (meter) 1150.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 131
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 23
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) 0.07285
Epicentral distance of station farthest from the epicenter (degree) 0.75183
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 79659271
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-05-28 13:59:43

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 78533341
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-04-24 13:08:35
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HVZN.HHE. 2020-04-24T12:57:18.49 0.3 undecidable manual S 136 83.4498 54 0.14 62
IV.HLNI.HHE. 2020-04-24T12:57:17.47 0.6 undecidable manual S 120 82.5507 54 -0.71 41
IV.SOLUN.HHE. 2020-04-24T12:57:14.28 1.0 undecidable manual S 312 61.7937 117 0.63 19
IV.RAFF.HHE. 2020-04-24T12:57:13.78 0.3 undecidable manual S 154 61.2942 117 0.26 65
IV.SCIAR.HHE. 2020-04-24T12:57:08.46 0.6 undecidable manual S 312 36.5412 132 0.43 46
IV.MUCR.HHE. 2020-04-24T12:57:07.52 0.3 undecidable manual P 63 79.9644 54 0.31 60
IV.PLLN.EHE. 2020-04-24T12:57:07.51 0.3 undecidable manual S 14 31.1466 137 0.49 67
IV.HLNI.HHE. 2020-04-24T12:57:07.23 1.0 undecidable manual P 120 82.5507 54 -0.3 22
IV.HVZN.HHE. 2020-04-24T12:57:07.07 0.3 undecidable manual P 136 83.4498 54 -0.57 61
IV.GIB.HHZ. 2020-04-24T12:57:07.37 0.3 undecidable manual S 355 30.1476 138 0.54 67
IV.CSLB.HHZ. 2020-04-24T12:57:05.71 0.3 undecidable manual S 360 24.1536 144 -0.12 72
IV.SOLUN.HHE. 2020-04-24T12:57:05.30 0.6 undecidable manual P 312 61.7937 117 0.38 42
IV.PETRA.HHZ. 2020-04-24T12:57:04.58 0.3 undecidable manual S 21 13.5753 158 0.11 76
IV.RAFF.HHE. 2020-04-24T12:57:04.80 0.1 undecidable manual P 154 61.2942 117 -0.05 92
IV.RESU.HHZ. 2020-04-24T12:57:04.36 1.0 undecidable manual S 181 8.0808 167 0.33 25
IV.MSFR.HHE. 2020-04-24T12:57:04.49 0.1 undecidable manual P 53 58.2972 118 0.05 90
IV.GALF.HHE. 2020-04-24T12:57:02.65 1.0 undecidable manual P 91 44.622 126 0 24
IV.SCIAR.HHE. 2020-04-24T12:57:01.85 0.1 undecidable manual P 312 36.5412 132 0.17 95
IV.GIB.HHZ. 2020-04-24T12:57:00.75 0.1 undecidable manual P 355 30.1476 138 -0.23 94
IV.PLLN.EHE. 2020-04-24T12:57:00.93 0.1 undecidable manual P 14 31.1466 137 -0.16 95
IV.CSLB.HHZ. 2020-04-24T12:56:59.89 0.1 undecidable manual P 360 24.1536 144 -0.51 88
IV.PETRA.HHZ. 2020-04-24T12:56:59.20 0.1 undecidable manual P 21 13.5753 158 -0.42 92
IV.RESU.HHZ. 2020-04-24T12:56:59.57 0.1 undecidable manual P 181 8.0808 167 0.21 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PETRA.HHE. ML:1.8 0.0002395 0.36 AML other m 2020-04-24T12:57:05.69
IV.RESU.HHE. ML:1.8 0.00023449999999999998 0.5 AML other m 2020-04-24T12:57:06.16
IV.CSLB.HHE. ML:1.4 0.0000785 0.46 AML other m 2020-04-24T12:57:06.41
IV.PETRA.HHN. ML:1.6 0.000131 0.3 AML other m 2020-04-24T12:57:06.59
IV.RESU.HHN. ML:1.8 0.00026700000000000004 0.56 AML other m 2020-04-24T12:57:06.82
IV.CSLB.HHN. ML:1.3 0.000060950000000000004 1 AML other m 2020-04-24T12:57:07.60
IV.GIB.HHE. ML:1.7 0.00014625 1.36 AML other m 2020-04-24T12:57:07.92
IV.GIB.HHN. ML:1.7 0.00015 1.16 AML other m 2020-04-24T12:57:08.79
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