Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 04-09-2021 and time 16:42:10 (Italy) in region 8 km NE Trevi (PG)

A magnitude ML 1.4 earthquake occured in region: 8 km NE Trevi (PG), on

  • 04-09-2021 14:42:10 (UTC)
  • 04-09-2021 16:42:10 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9160, 12.8320 at 9 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
Trevi PG 8 8469 8469
Sellano PG 8 1079 9548
Foligno PG 11 57155 66703
Campello sul Clitunno PG 12 2442 69145
Cerreto di Spoleto PG 13 1075 70220
Montefalco PG 15 5679 75899
Spello PG 16 8645 84544
Monte Cavallo MC 16 145 84689
Castel Ritaldi PG 17 3278 87967
Vallo di Nera PG 17 364 88331
Valtopina PG 17 1398 89729
Preci PG 17 724 90453
Bevagna PG 18 5081 95534
Serravalle di Chienti MC 20 1070 96604

Municipalities with at least 50000 inhabitants

An earthquake occurred to
11 Km E of Foligno (57155 inhabitants)
42 Km SE of Perugia (166134 inhabitants)
42 Km NE of Terni (111501 inhabitants)
77 Km W of Teramo (54892 inhabitants)
78 Km NW of L'Aquila (69753 inhabitants)
81 Km NE of Viterbo (67173 inhabitants)
96 Km SW of Ancona (100861 inhabitants)
98 Km SE of Arezzo (99543 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 2021-09-04
14:42:10		 42.9165 12.8322 9 2021-09-04
14:47:51		 Sala Sismica INGV-Roma 95033751
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-04 14:42:10 ± 0.05
Latitude 42.9165 ± 0.0027
Longitude 12.8322 ± 0.0037
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95033751

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 285
Semi-minor axis of confidence ellipse (meter) 222
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 236
Circular confidence region, given by single value of horizontal uncertainty (meter) 280.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 75
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 30
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.10342
Epicentral distance of station farthest from the epicenter (degree) 0.58636
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 15
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 30
Type of magnitude ML
Reference to an origin 95033751
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-04 14:47:51
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ARVD.HHZ. 2021-09-04T14:42:31.12 0.1 undecidable manual S 8 65.0904 50 0.24 89
IV.ATFO.HHZ. 2021-09-04T14:42:28.35 0.6 undecidable manual S 337 54.2013 50 0.38 44
IV.EL6.EHZ. 2021-09-04T14:42:27.23 0.6 undecidable manual S 25 50.7159 50 0.19 46
IV.MURB.HHZ. 2021-09-04T14:42:26.06 0.3 undecidable manual S 327 45.8208 50 0.33 68
IV.ARRO.EHZ. 2021-09-04T14:42:23.63 0.6 undecidable manual S 188 37.8288 50 0.04 49
IV.ARVD.HHZ. 2021-09-04T14:42:22.52 0.1 undecidable manual P 8 65.0904 50 0.19 90
IV.ATCC.EHZ. 2021-09-04T14:42:22.17 0.6 undecidable manual S 332 33.6441 50 -0.31 46
IV.CSP1.EHZ. 2021-09-04T14:42:22.86 0.6 undecidable manual S 57 35.9418 50 -0.24 47
IV.MC2.EHZ. 2021-09-04T14:42:21.24 0.6 undecidable manual S 91 28.9488 108 0.03 50
IV.GAVE.EHZ. 2021-09-04T14:42:20.21 0.6 undecidable manual S 168 25.3524 110 0.19 48
IV.ATFO.HHZ. 2021-09-04T14:42:20.45 0.1 undecidable manual P 337 54.2013 50 -0.2 92
IV.NRCA.HHZ. 2021-09-04T14:42:19.82 0.6 undecidable manual S 112 24.753 111 0.01 50
IV.MURB.HHZ. 2021-09-04T14:42:19.32 0.6 negative manual P 327 45.8208 50 -0.03 48
IV.MOMA.HHZ. 2021-09-04T14:42:19.57 0.6 undecidable manual S 240 24.6531 111 -0.23 48
IV.EL6.EHZ. 2021-09-04T14:42:19.80 0.1 undecidable manual P 25 50.7159 50 -0.31 90
IV.MML1.EHZ. 2021-09-04T14:42:19.53 0.6 undecidable manual S 27 24.6531 111 -0.24 48
IV.FDMO.HHZ. 2021-09-04T14:42:19.46 0.6 undecidable manual S 57 24.6531 111 -0.31 47
IV.ARRO.EHZ. 2021-09-04T14:42:18.04 0.6 negative manual P 188 37.8288 50 -0.08 48
IV.ASSB.HHZ. 2021-09-04T14:42:18.08 0.6 undecidable manual S 315 19.869 115 -0.17 49
IV.ATCC.EHZ. 2021-09-04T14:42:17.19 0.6 negative manual P 332 33.6441 50 -0.28 47
IV.CSP1.EHZ. 2021-09-04T14:42:17.72 0.6 negative manual P 57 35.9418 50 -0.12 48
IV.GAVE.EHZ. 2021-09-04T14:42:16.17 0.1 undecidable manual P 168 25.3524 110 0.11 98
IV.CESI.HHZ. 2021-09-04T14:42:16.21 0.6 undecidable manual S 31 11.4774 129 0.45 47
IV.MC2.EHZ. 2021-09-04T14:42:16.65 0.1 undecidable manual P 91 28.9488 108 -0.1 98
IV.MOMA.HHZ. 2021-09-04T14:42:16.00 0.3 undecidable manual P 240 24.6531 111 0.07 74
IV.MML1.EHZ. 2021-09-04T14:42:15.77 0.1 positive manual P 27 24.6531 111 -0.15 98
IV.FDMO.HHZ. 2021-09-04T14:42:15.86 0.6 undecidable manual P 57 24.6531 111 -0.06 50
IV.NRCA.HHZ. 2021-09-04T14:42:15.96 0.1 negative manual P 112 24.753 111 0.03 100
IV.ASSB.HHZ. 2021-09-04T14:42:14.94 0.1 negative manual P 315 19.869 115 -0.09 100
IV.CESI.HHZ. 2021-09-04T14:42:13.97 0.1 positive manual P 31 11.4774 129 0.37 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HNN. ML:1.6 0.000518 0.34 AML other m 2021-09-04T14:42:16.28
IV.CESI.HHN. ML:1.7 0.000558 0.48 AML other m 2021-09-04T14:42:16.29
IV.CESI.HNE. ML:1.5 0.00040800000000000005 0.16 AML other m 2021-09-04T14:42:16.33
IV.CESI.HHE. ML:1.6 0.000479 0.06 AML other m 2021-09-04T14:42:16.34
IV.ASSB.HHN. ML:1.3 0.0001595 0.94 AML other m 2021-09-04T14:42:19.13
IV.ASSB.HHE. ML:1.4 0.00018099999999999998 0.68 AML other m 2021-09-04T14:42:19.90
IV.MML1.EHE. ML:1.0 0.000058700000000000004 1.28 AML other m 2021-09-04T14:42:20.87
IV.FDMO.HHN. ML:1.2 0.00008465 1.26 AML other m 2021-09-04T14:42:20.88
IV.MML1.EHN. ML:1.0 0.00006355 0.82 AML other m 2021-09-04T14:42:20.31
IV.NRCA.HHN. ML:1.7 0.00028500000000000004 0.1 AML other m 2021-09-04T14:42:20.49
IV.FDMO.HHE. ML:1.2 0.00009145 0.6 AML other m 2021-09-04T14:42:20.79
IV.MOMA.HHN. ML:1.5 0.0001885 0.28 AML other m 2021-09-04T14:42:20.68
IV.MOMA.HHE. ML:1.6 0.00021349999999999999 0.14 AML other m 2021-09-04T14:42:20.62
IV.GAVE.EHN. ML:1.7 0.0002655 0.26 AML other m 2021-09-04T14:42:20.73
IV.NRCA.HHE. ML:1.6 0.00021400000000000002 1.4 AML other m 2021-09-04T14:42:20.23
IV.GAVE.EHE. ML:1.7 0.0002635 0.48 AML other m 2021-09-04T14:42:20.71
IV.ATCC.EHN. ML:1.4 0.0001095 0.64 AML other m 2021-09-04T14:42:22.31
IV.CSP1.EHN. ML:1.8 0.000249 0.3 AML other m 2021-09-04T14:42:23.31
IV.CSP1.EHE. ML:1.6 0.000176 0.7 AML other m 2021-09-04T14:42:23.43
IV.ATCC.EHE. ML:1.4 0.00009255 0.18 AML other m 2021-09-04T14:42:23.96
IV.ARRO.EHE. ML:0.9 0.00003245 0.24 AML other m 2021-09-04T14:42:24.21
IV.ARRO.EHN. ML:0.9 0.0000293 1.44 AML other m 2021-09-04T14:42:24.20
IV.MURB.HHE. ML:2.0 0.000299 0.24 AML other m 2021-09-04T14:42:27.20
IV.MURB.HHN. ML:1.7 0.000155 0.88 AML other m 2021-09-04T14:42:27.71
IV.EL6.EHN. ML:1.3 0.000053645000000000006 0.34 AML other m 2021-09-04T14:42:28.19
IV.EL6.EHE. ML:1.5 0.00007735 1.24 AML other m 2021-09-04T14:42:28.72
IV.ATFO.HHE. ML:1.4 0.0000566 0.24 AML other m 2021-09-04T14:42:29.01
IV.ATFO.HHN. ML:1.4 0.000057050000000000004 0.3 AML other m 2021-09-04T14:42:29.18
IV.ARVD.HHN. ML:0.7 0.00001185 0.44 AML other m 2021-09-04T14:42:33.33
IV.ARVD.HHE. ML:0.9 0.00001645 1.08 AML other m 2021-09-04T14:42:33.75
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