Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 04-08-2023 and time 03:26:57 (Italy) in region 4 km W Trevi (PG)

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

  • 04-08-2023 01:26:57 (UTC)
  • 04-08-2023 03:26:57 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8660, 12.6980 at 10 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 4 8469 8469
Montefalco PG 5 5679 14148
Castel Ritaldi PG 5 3278 17426
Campello sul Clitunno PG 8 2442 19868
Foligno PG 10 57155 77023
Giano dell'Umbria PG 10 3846 80869
Bevagna PG 11 5081 85950
Gualdo Cattaneo PG 13 6155 92105
Spello PG 14 8645 100750
Spoleto PG 15 38218 138968
Vallo di Nera PG 17 364 139332
Cannara PG 17 4305 143637
Massa Martana PG 17 3770 147407
Sant'Anatolia di Narco PG 19 564 147971
Cerreto di Spoleto PG 19 1075 149046
Sellano PG 19 1079 150125

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km S of Foligno (57155 inhabitants)
34 Km N of Terni (111501 inhabitants)
37 Km SE of Perugia (166134 inhabitants)
69 Km NE of Viterbo (67173 inhabitants)
81 Km NW of L'Aquila (69753 inhabitants)
85 Km W of Teramo (54892 inhabitants)
94 Km SE of Arezzo (99543 inhabitants)
96 Km N of Guidonia Montecelio (88673 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 2023-08-04
01:26:57		 42.8655 12.6978 10 2023-08-04
01:32:51		 Sala Sismica INGV-Roma 119839361
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-08-04 01:26:57 ± 0.06
Latitude 42.8655 ± 0.0027
Longitude 12.6978 ± 0.0049
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 119839361

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 352
Semi-minor axis of confidence ellipse (meter) 264
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 291
Circular confidence region, given by single value of horizontal uncertainty (meter) 350.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 66
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.52341
Number of stations at which the event was observed 17
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 119839361
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-08-04 01:32:51
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PIEI.HHZ. 2023-08-04T01:27:22.62 3.0 undecidable manual S 0.59 0
IV.SMA1.EHZ. 2023-08-04T01:27:16.28 0.3 undecidable manual S 116 58.0974 50 0.44 65
IV.GUMA.HHZ. 2023-08-04T01:27:15.78 3.0 undecidable manual S -0.29 0
IV.MURB.HNZ. 2023-08-04T01:27:13.48 0.3 undecidable manual S 342 46.3203 50 0.8 58
IV.FDMO.HHZ. 2023-08-04T01:27:10.05 0.6 undecidable manual S 59 36.8298 50 -0.13 48
IV.ATCC.EHZ. 2023-08-04T01:27:09.70 0.6 undecidable manual S 352 35.742 50 -0.18 48
IV.NRCA.HHZ. 2023-08-04T01:27:09.38 0.6 undecidable manual S 96 34.0437 50 -0.04 49
IV.MML1.EHZ. 2023-08-04T01:27:09.45 0.6 undecidable manual S 39 35.3424 50 -0.32 46
IV.CESX.HHZ. 2023-08-04T01:27:08.06 0.6 undecidable manual S 198 29.9478 50 -0.26 47
IV.ARRO.EHZ. 2023-08-04T01:27:08.85 0.6 undecidable manual S 170 32.2455 50 -0.09 49
IV.SMA1.EHZ. 2023-08-04T01:27:08.99 1.0 negative manual P 116 58.0974 50 0.86 18
IV.MMO1.EHZ. 2023-08-04T01:27:07.09 0.6 undecidable manual P 86 51.3153 50 0.01 48
IV.MGAB.HHZ. 2023-08-04T01:27:06.39 0.1 undecidable manual P 276 47.9187 50 -0.17 93
IV.MURB.HNZ. 2023-08-04T01:27:06.45 0.1 undecidable manual P 342 46.3203 50 0.14 94
IV.CESI.HHZ. 2023-08-04T01:27:06.23 0.6 undecidable manual S 47 22.8549 113 0.01 50
IV.CSP1.EHZ. 2023-08-04T01:27:06.63 0.3 positive manual P 58 48.2184 50 0.03 72
IV.LNSS.HHZ. 2023-08-04T01:27:05.41 0.1 undecidable manual P 136 40.3263 50 0.02 98
IV.ASSB.HHZ. 2023-08-04T01:27:05.20 0.6 undecidable manual S 351 19.869 116 -0.1 50
IV.NRCA.HHZ. 2023-08-04T01:27:04.28 0.1 undecidable manual P 96 34.0437 50 -0.14 96
IV.MML1.EHZ. 2023-08-04T01:27:04.43 0.6 negative manual P 39 35.3424 50 -0.2 48
IV.ARRO.EHZ. 2023-08-04T01:27:04.26 0.1 undecidable manual P 170 32.2455 50 0.11 97
IV.FDMO.HHZ. 2023-08-04T01:27:04.72 0.1 undecidable manual P 59 36.8298 50 -0.14 96
IV.ATCC.EHZ. 2023-08-04T01:27:04.53 0.1 undecidable manual P 352 35.742 50 -0.16 96
IV.MOMA.HHZ. 2023-08-04T01:27:03.06 0.6 undecidable manual S 237 12.4764 128 -0.04 51
IV.CESX.HHZ. 2023-08-04T01:27:03.64 0.1 undecidable manual P 198 29.9478 50 -0.15 97
IV.CESI.HHZ. 2023-08-04T01:27:02.63 0.1 undecidable manual P 47 22.8549 113 0.05 100
IV.ASSB.HHZ. 2023-08-04T01:27:01.95 0.3 negative manual P 351 19.869 116 -0.09 75
IV.MOMA.HHZ. 2023-08-04T01:27:00.96 0.1 undecidable manual P 237 12.4764 128 0.19 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HNE. ML:1.6 0.0004625 0.2 AML other m 2023-08-04T01:27:03.53
IV.MOMA.HHE. ML:1.6 0.000501 0.2 AML other m 2023-08-04T01:27:03.63
IV.MOMA.HHN. ML:0.9 0.000087 0.14 AML other m 2023-08-04T01:27:04.05
IV.MOMA.HNN. ML:1.5 0.000377 1.32 AML other m 2023-08-04T01:27:04.13
IV.ASSB.HHN. ML:1.3 0.00013800000000000002 0.5 AML other m 2023-08-04T01:27:06.73
IV.ASSB.HHE. ML:1.2 0.000131 0.3 AML other m 2023-08-04T01:27:07.15
IV.CESI.HHN. ML:1.4 0.0001505 1.7 AML other m 2023-08-04T01:27:07.98
IV.CESI.HHE. ML:1.3 0.0001357 0.44 AML other m 2023-08-04T01:27:07.70
IV.CESX.HHN. ML:1.3 0.00009175 0.42 AML other m 2023-08-04T01:27:08.84
IV.CESX.HHE. ML:1.3 0.0000954 0.4 AML other m 2023-08-04T01:27:09.19
IV.NRCA.HHN. ML:1.6 0.00015200000000000004 1.06 AML other m 2023-08-04T01:27:09.81
IV.MML1.EHN. ML:1.2 0.0000606 0.68 AML other m 2023-08-04T01:27:09.89
IV.FDMO.HHE. ML:1.2 0.00006654999999999999 0.18 AML other m 2023-08-04T01:27:10.98
IV.FDMO.HHN. ML:1.3 0.00008115 1.22 AML other m 2023-08-04T01:27:11.67
IV.NRCA.HHE. ML:1.6 0.000162 0.82 AML other m 2023-08-04T01:27:11.91
IV.MML1.EHE. ML:1.2 0.000071 0.76 AML other m 2023-08-04T01:27:12.53
IV.ARRO.EHN. ML:1.0 0.0000408 1.22 AML other m 2023-08-04T01:27:12.74
IV.ARRO.EHE. ML:1.0 0.000042000000000000004 1.42 AML other m 2023-08-04T01:27:12.99
IV.LNSS.HHE. ML:1.3 0.0000724 0.12 AML other m 2023-08-04T01:27:13.67
IV.LNSS.HHN. ML:1.3 0.00007055000000000001 0.86 AML other m 2023-08-04T01:27:13.72
IV.CSP1.EHN. ML:1.9 0.00021250000000000002 1.86 AML other m 2023-08-04T01:27:13.97
IV.CSP1.EHE. ML:1.8 0.00017999999999999998 1.26 AML other m 2023-08-04T01:27:14.32
IV.MMO1.EHE. ML:1.9 0.0001975 0.72 AML other m 2023-08-04T01:27:14.60
IV.MGAB.HHN. ML:1.3 0.000048799999999999994 0.92 AML other m 2023-08-04T01:27:14.27
IV.MMO1.EHN. ML:1.5 0.00008444999999999999 0.96 AML other m 2023-08-04T01:27:15.89
IV.MURB.HNE. ML:2.2 0.00044699999999999997 1.46 AML other m 2023-08-04T01:27:16.07
IV.MURB.HNN. ML:2.3 0.000615 1.1 AML other m 2023-08-04T01:27:16.42
IV.MGAB.HHE. ML:1.3 0.0000571 1.56 AML other m 2023-08-04T01:27:16.06
IV.SMA1.EHE. ML:1.4 0.00005065 0.42 AML other m 2023-08-04T01:27:27.30
IV.SMA1.EHN. ML:1.4 0.000054000000000000005 0.42 AML other m 2023-08-04T01:27:29.24
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