Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 31-07-2023 and time 18:03:50 (Italy) in region 4 km W Trevi (PG)

A magnitude ML 1.8 earthquake occured in region: 4 km W Trevi (PG), on

  • 31-07-2023 16:03:50 (UTC)
  • 31-07-2023 18:03:50 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8650, 12.7040 at 9 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
Trevi PG 4 8469 8469
Castel Ritaldi PG 5 3278 11747
Montefalco PG 5 5679 17426
Campello sul Clitunno PG 8 2442 19868
Foligno PG 10 57155 77023
Giano dell'Umbria PG 11 3846 80869
Bevagna PG 11 5081 85950
Gualdo Cattaneo PG 13 6155 92105
Spello PG 15 8645 100750
Spoleto PG 15 38218 138968
Vallo di Nera PG 17 364 139332
Cannara PG 18 4305 143637
Massa Martana PG 18 3770 147407
Cerreto di Spoleto PG 18 1075 148482
Sant'Anatolia di Narco PG 18 564 149046
Sellano PG 18 1079 150125
Scheggino PG 20 461 150586

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)
70 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
Bulletin
Rev1000 		ML 1.8 2023-07-31
16:03:50		 42.8652 12.7045 9 2024-09-10
16:44:15		 Bollettino Sismico Italiano INGV 120465751
Reviewed
Rev100 		ML 1.8 2023-07-31
16:03:50		 42.8655 12.704 10 2023-07-31
16:13:14		 Sala Sismica INGV-Roma 119734061
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-07-31 16:03:50 ± 0.03
Latitude 42.8652 ± 0.0018
Longitude 12.7045 ± 0.0025
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 120465751

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 179
Semi-minor axis of confidence ellipse (meter) 135
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 130
Circular confidence region, given by single value of horizontal uncertainty (meter) 180.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 61
Number of associated phases, regardless of their use for origin computation 47
Number of defining phases 47
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.11601
Epicentral distance of station farthest from the epicenter (degree) 0.68169
Number of stations at which the event was observed 26
Number of stations from which data was used for origin computation 26
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 38
Type of magnitude ML
Reference to an origin 119734061
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-07-31 16:13:14

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 48
Type of magnitude ML
Reference to an origin 120465751
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-08-28 05:43:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ATFO.HHN. 2023-07-31T16:04:08.50 0.6 undecidable manual S 349 56.6988 50 0.29 44
IV.TSM1.DHE.01 2023-07-31T16:04:07.53 0.6 undecidable manual S 351 54.0015 50 0.04 47
IV.FOSV.EHZ. 2023-07-31T16:04:06.08 0.3 undecidable manual S 5 47.9187 50 0.21 69
IV.MGAB.HHZ. 2023-07-31T16:04:06.18 0.6 undecidable manual S 276 48.4182 50 0.16 46
IV.SNTG.HHE. 2023-07-31T16:04:06.11 0.6 undecidable manual S 24 47.3193 50 0.4 44
IV.MMO1.EHZ. 2023-07-31T16:04:06.95 0.3 undecidable manual S 85 50.7159 50 0.32 67
IV.MURB.HHZ. 2023-07-31T16:04:05.65 0.6 undecidable manual S 342 46.5201 50 0.15 47
IV.LNSS.HNZ. 2023-07-31T16:04:03.84 0.6 undecidable manual S 137 39.9267 50 0.09 48
IV.ARVD.HHZ. 2023-07-31T16:04:03.20 0.3 undecidable manual P 15 72.7716 50 0.1 67
IV.PIEI.HHZ. 2023-07-31T16:04:03.74 0.3 undecidable manual P 350 75.6687 50 0.2 65
IV.MML1.EHZ. 2023-07-31T16:04:02.06 0.3 undecidable manual S 38 35.0427 50 -0.39 68
IV.NRCA.HHZ. 2023-07-31T16:04:02.01 0.1 undecidable manual S 96 33.5442 50 -0.02 98
IV.ATCC.EHZ. 2023-07-31T16:04:02.41 0.3 undecidable manual S 352 35.8419 50 -0.25 70
IV.FDMO.HHZ. 2023-07-31T16:04:02.66 0.3 undecidable manual S 58 36.4413 50 -0.15 71
IV.ARRO.EHZ. 2023-07-31T16:04:01.45 0.3 undecidable manual S 171 32.1456 50 -0.21 71
IV.RM33.EHZ. 2023-07-31T16:04:01.01 0.3 undecidable manual P 133 57.3981 50 0.29 66
IV.FEMA.HNZ. 2023-07-31T16:04:01.20 0.3 undecidable manual S 69 30.0477 50 0.09 73
IV.ATVO.HHZ. 2023-07-31T16:04:01.84 0.3 undecidable manual P 337 62.1933 50 0.38 65
IT.MTCL.HGZ. 2023-07-31T16:04:00.17 0.3 undecidable manual S 59 27.8499 108 -0.25 71
IV.SMA1.EHZ. 2023-07-31T16:04:00.95 0.3 undecidable manual P 117 57.5979 50 0.19 68
IV.ATFO.HHN. 2023-07-31T16:04:00.63 0.3 undecidable manual P 349 56.6988 50 0.02 70
IV.TSM1.DHE.01 2023-07-31T16:04:00.12 0.3 undecidable manual P 351 54.0015 50 -0.07 70
IV.CESX.HHZ. 2023-07-31T16:04:00.81 0.3 undecidable manual S 199 30.0477 50 -0.3 70
IV.SNTG.HHE. 2023-07-31T16:03:59.23 0.6 undecidable manual P 24 47.3193 50 0.06 47
IV.GAVE.EHZ. 2023-07-31T16:03:59.37 0.3 undecidable manual S 141 24.6531 111 0.02 75
IV.MMO1.EHZ. 2023-07-31T16:03:59.76 0.1 undecidable manual P 85 50.7159 50 0.07 94
IV.MURB.HHZ. 2023-07-31T16:03:59.03 0.1 undecidable manual P 342 46.5201 50 -0.01 96
IV.MGAB.HHZ. 2023-07-31T16:03:59.27 0.1 undecidable manual P 276 48.4182 50 -0.07 94
IV.FOSV.EHZ. 2023-07-31T16:03:59.15 0.1 undecidable manual P 5 47.9187 50 -0.11 94
IV.CESI.HHZ. 2023-07-31T16:03:58.68 0.3 undecidable manual S 46 22.4553 112 0.03 75
IV.ASSB.HHZ. 2023-07-31T16:03:57.77 0.6 undecidable manual S 349 20.0688 115 -0.11 49
IV.FDMO.HHZ. 2023-07-31T16:03:57.35 0.1 undecidable manual P 58 36.4413 50 -0.14 95
IV.ARRO.EHZ. 2023-07-31T16:03:57.04 0.1 undecidable manual P 171 32.1456 50 0.21 94
IV.LNSS.HNZ. 2023-07-31T16:03:57.92 0.1 undecidable manual P 137 39.9267 50 -0.11 95
IV.ATCC.EHZ. 2023-07-31T16:03:57.19 0.3 undecidable manual P 352 35.8419 50 -0.22 70
IV.MML1.EHZ. 2023-07-31T16:03:57.07 0.1 undecidable manual P 38 35.0427 50 -0.21 94
IV.CESX.HHZ. 2023-07-31T16:03:56.26 0.1 undecidable manual P 199 30.0477 50 -0.25 94
IV.FEMA.HNZ. 2023-07-31T16:03:56.54 0.1 undecidable manual P 69 30.0477 50 0.03 98
IT.MTCL.HGZ. 2023-07-31T16:03:56.01 0.3 undecidable manual P 59 27.8499 108 -0.1 73
IV.NRCA.HHZ. 2023-07-31T16:03:56.90 0.1 undecidable manual P 96 33.5442 50 -0.14 95
IV.GAVE.EHZ. 2023-07-31T16:03:55.73 0.1 undecidable manual P 141 24.6531 111 0.24 95
IV.CESI.HHZ. 2023-07-31T16:03:55.16 0.1 undecidable manual P 46 22.4553 112 0.07 99
IV.MOMA.HHZ. 2023-07-31T16:03:55.67 0.3 undecidable manual S 238 12.876 126 -0.05 76
IT.GNU.HGZ. 2023-07-31T16:03:55.69 0.3 undecidable manual S 238 12.876 126 -0.03 76
IV.ASSB.HHZ. 2023-07-31T16:03:54.56 0.1 negative manual P 349 20.0688 115 -0.08 99
IT.GNU.HGZ. 2023-07-31T16:03:53.49 0.3 undecidable manual P 238 12.876 126 0.09 75
IV.MOMA.HHZ. 2023-07-31T16:03:53.49 0.1 undecidable manual P 238 12.876 126 0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHE. ML:2.3 0.002025 0.2 AML other m 2023-07-31T16:03:56.26
IV.MOMA.HNE. ML:2.2 0.0019199999999999998 0.2 AML other m 2023-07-31T16:03:56.26
IV.MOMA.HHN. ML:1.5 0.000382 0.14 AML other m 2023-07-31T16:03:56.68
IV.MOMA.HNN. ML:2.0 0.00124 0.14 AML other m 2023-07-31T16:03:56.68
IV.CESI.HHE. ML:1.8 0.00039002035 0.3328 AML other m 2023-07-31T16:03:58.75
IV.CESI.HNE. ML:1.8 0.00037286025 0.3328 AML other m 2023-07-31T16:03:58.75
IV.ASSB.HHN. ML:1.7 0.0004157228 0.1792 AML other m 2023-07-31T16:03:58.89
IV.ASSB.HHE. ML:1.7 0.00040040925000000004 0.1664 AML other m 2023-07-31T16:03:59.76
IV.CESI.HHN. ML:1.9 0.0004861704 0.128 AML other m 2023-07-31T16:04:00.10
IV.CESI.HNN. ML:1.8 0.0004316208 0.128 AML other m 2023-07-31T16:04:00.10
IV.CESX.HHN. ML:1.9 0.00035650000000000005 0.48 AML other m 2023-07-31T16:04:01.47
IV.GAVE.EHN. ML:1.8 0.00035873100000000005 1.7952 AML other m 2023-07-31T16:04:02.01
IV.ARRO.EHE. ML:1.5 0.0001365 0.22 AML other m 2023-07-31T16:04:02.35
IV.NRCA.HHN. ML:2.0 0.00045399709999999996 0.1024 AML other m 2023-07-31T16:04:02.43
IV.NRCA.HNN. ML:2.0 0.00042157475 0.1152 AML other m 2023-07-31T16:04:02.44
IV.MML1.HNE. ML:1.7 0.00018747049999999997 0.2176 AML other m 2023-07-31T16:04:02.44
IV.NRCA.HHE. ML:2.1 0.000536 0.14 AML other m 2023-07-31T16:04:02.46
IV.NRCA.HNE. ML:2.0 0.0004721902 0.128 AML other m 2023-07-31T16:04:02.53
IV.MML1.EHN. ML:1.6 0.00014458345 0.1664 AML other m 2023-07-31T16:04:02.73
IV.GAVE.HNN. ML:1.4 0.00015109715000000002 0.3584 AML other m 2023-07-31T16:04:02.78
IV.GAVE.HNE. ML:1.9 0.0004629927 0.256 AML other m 2023-07-31T16:04:02.90
IV.GAVE.EHE. ML:1.9 0.000474 0.26 AML other m 2023-07-31T16:04:02.91
IV.FDMO.HHN. ML:1.9 0.00028046965 0.1792 AML other m 2023-07-31T16:04:03.30
IV.CESX.HHE. ML:1.9 0.00036662925 0.4224 AML other m 2023-07-31T16:04:03.24
IV.ATCC.HNN. ML:1.7 0.0002020163 0.128 AML other m 2023-07-31T16:04:03.80
IV.ATCC.EHN. ML:1.7 0.00020050000000000002 1.08 AML other m 2023-07-31T16:04:03.82
IV.ATCC.HNE. ML:1.9 0.0003312948 0.192 AML other m 2023-07-31T16:04:03.96
IV.ATCC.EHE. ML:1.8 0.0002612101 0.1792 AML other m 2023-07-31T16:04:03.87
IV.FDMO.HHE. ML:1.8 0.000252 0.18 AML other m 2023-07-31T16:04:04.62
IV.ARRO.EHN. ML:1.5 0.0001315 0.16 AML other m 2023-07-31T16:04:05.89
IV.MURB.HHE. ML:2.0 0.00032 0.26 AML other m 2023-07-31T16:04:06.47
IV.MURB.HNE. ML:2.0 0.0003266556 0.2944 AML other m 2023-07-31T16:04:06.77
IV.MGAB.HHE. ML:1.8 0.0001615 1.66 AML other m 2023-07-31T16:04:06.83
IV.MMO1.EHE. ML:2.4 0.0006839999999999999 0.2 AML other m 2023-07-31T16:04:07.23
IV.MURB.HHN. ML:2.0 0.00027886455 0.1792 AML other m 2023-07-31T16:04:07.30
IV.FOSV.EHE. ML:1.4 0.00007374999999999999 1 AML other m 2023-07-31T16:04:07.91
IV.MGAB.HHN. ML:1.7 0.00015065475 0.1536 AML other m 2023-07-31T16:04:07.90
IV.MGAB.HNN. ML:1.7 0.00014779481 0.1792 AML other m 2023-07-31T16:04:07.90
IV.MMO1.EHN. ML:2.1 0.000312 0.98 AML other m 2023-07-31T16:04:08.78
IV.FOSV.EHN. ML:1.5 0.00008549999999999999 1.68 AML other m 2023-07-31T16:04:08.85
IV.RM33.EHE. ML:1.7 0.0001081 1.78 AML other m 2023-07-31T16:04:11.93
IV.SMA1.EHE. ML:1.7 0.00012165 0.54 AML other m 2023-07-31T16:04:11.55
IV.RM33.EHN. ML:1.7 0.0001177 0.24 AML other m 2023-07-31T16:04:11.38
IV.SMA1.EHN. ML:1.6 0.0000876 0.42 AML other m 2023-07-31T16:04:11.77
IV.ATVO.HHN. ML:1.2 0.00003075 1.14 AML other m 2023-07-31T16:04:14.80
IV.PIEI.HHE. ML:1.5 0.000043261325 1.8464 AML other m 2023-07-31T16:04:15.94
IV.ATVO.HHE. ML:1.2 0.00003715 0.26 AML other m 2023-07-31T16:04:16.55
IV.PIEI.HHN. ML:1.4 0.000034 0.88 AML other m 2023-07-31T16:04:17.48
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