Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 07-10-2021 and time 17:30:04 (Italy) in region 2 km S Salaparuta (TP)

A magnitude ML 1.3 earthquake occured in region: 2 km S Salaparuta (TP), on

  • 07-10-2021 15:30:04 (UTC)
  • 07-10-2021 17:30:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.7400, 13.0030 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
Salaparuta TP 2 1696 1696
Poggioreale TP 4 1494 3190
Montevago AG 4 3006 6196
Santa Margherita di Belice AG 6 6363 12559
Partanna TP 10 10607 23166
Santa Ninfa TP 11 5043 28209
Sambuca di Sicilia AG 14 5877 34086
Gibellina TP 14 4115 38201
Menfi AG 16 12592 50793
Contessa Entellina PA 16 1766 52559
Roccamena PA 18 1505 54064
Camporeale PA 19 3373 57437
Salemi TP 20 10794 68231
Castelvetrano TP 20 31806 100037

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km E of Mazara del Vallo (51718 inhabitants)
50 Km E of Marsala (83194 inhabitants)
53 Km SW of Palermo (674435 inhabitants)
53 Km SE of Trapani (68759 inhabitants)
59 Km SW of Bagheria (55387 inhabitants)
70 Km NW of Agrigento (59770 inhabitants)
97 Km W of Caltanissetta (63360 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 1.3 2021-10-07
15:30:04		 37.7398 13.0028 10 2022-03-30
13:04:12		 Bollettino Sismico Italiano INGV 96729871
Reviewed
Rev100 		ML 1.5 2021-10-07
15:30:04		 37.7372 13.0092 11 2021-10-07
15:39:38		 Sala Sismica INGV-Roma 96323621
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-07 15:30:04 ± 0.13
Latitude 37.7398 ± 0.0072
Longitude 13.0028 ± 0.0136
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 96729871

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1314
Semi-minor axis of confidence ellipse (meter) 549
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 248
Circular confidence region, given by single value of horizontal uncertainty (meter) 1310.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 145
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
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) 0.08004
Epicentral distance of station farthest from the epicenter (degree) 0.34624
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 96729871
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-18 15:10:00

ML:1.5

Field Value
Value 1.5
Uncertainty 0.4
Num. used stations 12
Type of magnitude ML
Reference to an origin 96323621
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-07 15:39:38
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MARS.HHE. 2021-10-07T15:30:17.51 0.6 undecidable manual S 272 38.4282 50 0.36 44
MN.CLTB.HHZ. 2021-10-07T15:30:14.23 0.3 undecidable manual S 134 25.9518 50 0.43 67
IV.SCIAC.HHZ. 2021-10-07T15:30:13.78 0.3 undecidable manual S 161 26.2515 50 -0.11 72
IV.MBFT.HHZ. 2021-10-07T15:30:12.65 0.3 undecidable manual S 349 23.2545 114 -0.4 68
IV.MARS.HHE. 2021-10-07T15:30:11.56 0.3 undecidable manual P 272 38.4282 50 -0.13 70
MN.CLTB.HHZ. 2021-10-07T15:30:10.01 0.3 undecidable manual P 134 25.9518 50 0.26 70
IV.MBFT.HHZ. 2021-10-07T15:30:09.19 0.1 undecidable manual P 349 23.2545 114 -0.12 96
IV.MTGR.HHZ. 2021-10-07T15:30:09.44 0.3 undecidable manual P 309 27.3504 50 -0.53 65
IV.MFNL.HHZ. 2021-10-07T15:30:09.56 0.3 undecidable manual S 309 9.0798 138 0.61 65
IV.SCIAC.HHZ. 2021-10-07T15:30:09.54 0.3 undecidable manual P 161 26.2515 50 -0.26 69
IV.MMGO.HNZ. 2021-10-07T15:30:08.54 0.1 undecidable manual S 195 8.88 139 -0.38 93
IV.MFNL.HHZ. 2021-10-07T15:30:07.36 0.1 negative manual P 309 9.0798 138 0.41 92
IV.MMGO.HNZ. 2021-10-07T15:30:06.97 0.1 negative manual P 195 8.88 139 0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MFNL.HHN. ML:1.5 0.00040998325 1.3856 AML other m 2021-10-07T15:30:09.05
IV.MFNL.HHE. ML:1.6 0.0004715 0.08 AML other m 2021-10-07T15:30:09.79
IV.MBFT.HHN. ML:1.0 0.000064691915 0.256 AML other m 2021-10-07T15:30:13.48
IV.MBFT.HHE. ML:0.9 0.000055696255 0.2816 AML other m 2021-10-07T15:30:13.66
IV.SCIAC.HHE. ML:1.4 0.00014855665000000002 0.1408 AML other m 2021-10-07T15:30:14.15
IV.SCIAC.HHN. ML:1.4 0.0001317672 0.1536 AML other m 2021-10-07T15:30:15.66
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