Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 25-10-2021 and time 19:55:17 (Italy) in region 4 km NW Preci (PG)

A magnitude ML 1.4 earthquake occured in region: 4 km NW Preci (PG), on

  • 25-10-2021 17:55:17 (UTC)
  • 25-10-2021 19:55:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9110, 13.0190 at 11 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
Preci PG 4 724 724
Visso MC 6 1107 1831
Sellano PG 8 1079 2910
Monte Cavallo MC 9 145 3055
Ussita MC 11 444 3499
Castelsantangelo sul Nera MC 11 281 3780
Cerreto di Spoleto PG 13 1075 4855
Norcia PG 15 4957 9812
Pieve Torina MC 15 1458 11270
Fiordimonte MC 15 202 11472
Pievebovigliana MC 18 866 12338
Fiastra MC 18 559 12897
Acquacanina MC 18 121 13018
Serravalle di Chienti MC 19 1070 14088
Muccia MC 19 915 15003
Bolognola MC 19 142 15145

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km E of Foligno (57155 inhabitants)
49 Km NE of Terni (111501 inhabitants)
56 Km E of Perugia (166134 inhabitants)
63 Km W of Teramo (54892 inhabitants)
70 Km NW of L'Aquila (69753 inhabitants)
88 Km SW of Ancona (100861 inhabitants)
93 Km NE of Viterbo (67173 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 1.4 2021-10-25
17:55:17		 42.9113 13.0188 11 2021-10-25
18:08:43		 Sala Sismica INGV-Roma 96986311
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-25 17:55:17 ± 0.06
Latitude 42.9113 ± 0.0027
Longitude 13.0188 ± 0.0049
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96986311

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 430
Semi-minor axis of confidence ellipse (meter) 222
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 243
Circular confidence region, given by single value of horizontal uncertainty (meter) 430.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 138
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.42178
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 96986311
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-25 18:08:43
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VIVA.HHZ. 2021-10-25T17:55:54.67 3.0 undecidable manual S -0.31 0
IV.EL6.EHZ. 2021-10-25T17:55:33.59 0.3 undecidable manual S 8 46.8198 50 0.56 64
IV.CESX.HHZ. 2021-10-25T17:55:31.71 3.0 undecidable manual P 0
IV.SNTG.HHZ. 2021-10-25T17:55:30.94 0.3 undecidable manual S 351 38.628 50 0.1 72
IV.LNSS.HHZ. 2021-10-25T17:55:29.66 0.3 undecidable manual S 177 34.2435 50 0 74
IV.MMO1.EHZ. 2021-10-25T17:55:27.10 0.3 undecidable manual S 93 25.0527 50 -0.11 74
IV.CSP1.EHZ. 2021-10-25T17:55:27.05 0.3 undecidable manual S 37 25.0527 50 -0.16 73
IV.ATCC.EHZ. 2021-10-25T17:55:26.22 0.3 undecidable manual P 315 43.2234 50 0.12 71
IV.EL6.EHZ. 2021-10-25T17:55:26.56 0.3 undecidable manual P 8 46.8198 50 -0.1 71
IV.MML1.EHZ. 2021-10-25T17:55:26.31 0.3 undecidable manual S 350 22.755 50 -0.29 71
IV.SNTG.HHZ. 2021-10-25T17:55:25.33 0.1 undecidable manual P 351 38.628 50 -0.07 97
IV.MF5.EHZ. 2021-10-25T17:55:25.66 3.0 negative manual P 0.66 0
IV.FDMO.HHZ. 2021-10-25T17:55:24.08 0.3 undecidable manual S 22 14.9739 125 -0.26 73
IV.MC2.EHZ. 2021-10-25T17:55:24.25 0.3 undecidable manual S 90 13.7751 128 0.23 73
IV.LNSS.HHZ. 2021-10-25T17:55:24.72 0.3 undecidable manual P 177 34.2435 50 0 74
IV.CESI.HHZ. 2021-10-25T17:55:23.87 0.3 undecidable manual S 318 13.9749 127 -0.18 74
IV.MMO1.EHZ. 2021-10-25T17:55:23.17 0.3 undecidable manual P 93 25.0527 50 -0.13 73
IV.CSP1.EHZ. 2021-10-25T17:55:23.32 0.3 undecidable manual P 37 25.0527 50 0.01 75
IV.NRCA.HHZ. 2021-10-25T17:55:23.29 0.1 undecidable manual S 138 11.5773 133 -0.14 100
IV.MML1.EHZ. 2021-10-25T17:55:22.92 0.3 undecidable manual P 350 22.755 50 -0.03 75
IV.NRCA.HHZ. 2021-10-25T17:55:21.16 0.3 undecidable manual P 138 11.5773 133 0.04 77
IV.CESI.HHZ. 2021-10-25T17:55:21.65 0.1 undecidable manual P 318 13.9749 127 0.17 99
IV.FDMO.HHZ. 2021-10-25T17:55:21.72 0.3 undecidable manual P 22 14.9739 125 0.07 76
IV.MC2.EHZ. 2021-10-25T17:55:21.70 0.3 undecidable manual P 90 13.7751 128 0.23 73
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.5 0.00035950000000000006 0.16 AML other m 2021-10-25T17:55:23.46
IV.NRCA.HNE. ML:1.5 0.000382 0.54 AML other m 2021-10-25T17:55:23.38
IV.NRCA.HHN. ML:1.7 0.000554 0.08 AML other m 2021-10-25T17:55:23.41
IV.NRCA.HNN. ML:1.6 0.000523 1.12 AML other m 2021-10-25T17:55:23.37
IV.CESI.HHE. ML:1.3 0.00019800000000000002 0.18 AML other m 2021-10-25T17:55:24.19
IV.CESI.HHN. ML:1.4 0.00023999999999999998 0.32 AML other m 2021-10-25T17:55:24.12
IV.FDMO.HHN. ML:1.3 0.000179 0.16 AML other m 2021-10-25T17:55:24.48
IV.FDMO.HHE. ML:1.7 0.00042800000000000005 0.8 AML other m 2021-10-25T17:55:24.36
IV.MML1.EHN. ML:1.2 0.00010385 0.18 AML other m 2021-10-25T17:55:26.76
IV.MML1.EHE. ML:1.0 0.00007055000000000001 1.74 AML other m 2021-10-25T17:55:27.96
IV.CSP1.EHN. ML:1.5 0.0001955 0.24 AML other m 2021-10-25T17:55:27.83
IV.CSP1.EHE. ML:1.4 0.000164 0.42 AML other m 2021-10-25T17:55:27.99
IV.LNSS.HHE. ML:1.2 0.00006945 0.6 AML other m 2021-10-25T17:55:31.17
IV.LNSS.HHN. ML:1.1 0.0000486 1.44 AML other m 2021-10-25T17:55:31.08
IV.SNTG.HHN. ML:1.0 0.00003705 0.12 AML other m 2021-10-25T17:55:32.04
IV.SNTG.HHE. ML:1.0 0.000039149999999999996 1.74 AML other m 2021-10-25T17:55:32.91
IV.EL6.EHE. ML:1.3 0.00005784783 1.9968 AML other m 2021-10-25T17:55:33.76
IV.EL6.EHN. ML:1.4 0.00007363495999999999 3.5328 AML other m 2021-10-25T17:55:34.85
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