Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 04-08-2023 and time 04:34:17 (Italy) in region 1 km SE Foligno (PG)

A magnitude ML 1.5 earthquake occured in region: 1 km SE Foligno (PG), on

  • 04-08-2023 02:34:17 (UTC)
  • 04-08-2023 04:34:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9460, 12.7130 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
Foligno PG 1 57155 57155
Spello PG 6 8645 65800
Montefalco PG 8 5679 71479
Trevi PG 8 8469 79948
Bevagna PG 9 5081 85029
Cannara PG 12 4305 89334
Valtopina PG 13 1398 90732
Gualdo Cattaneo PG 13 6155 96887
Castel Ritaldi PG 14 3278 100165
Campello sul Clitunno PG 15 2442 102607
Assisi PG 16 28299 130906
Giano dell'Umbria PG 17 3846 134752
Sellano PG 19 1079 135831
Bastia Umbra PG 19 21874 157705
Nocera Umbra PG 20 5839 163544

Municipalities with at least 50000 inhabitants

An earthquake occurred to
1 Km SE of Foligno (57155 inhabitants)
32 Km SE of Perugia (166134 inhabitants)
43 Km N of Terni (111501 inhabitants)
77 Km NE of Viterbo (67173 inhabitants)
87 Km NW of L'Aquila (69753 inhabitants)
87 Km W of Teramo (54892 inhabitants)
89 Km SE of Arezzo (99543 inhabitants)
99 Km SW of Ancona (100861 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 1.5 2023-08-04
02:34:17		 42.9462 12.7133 9 2023-08-04
03:27:47		 Sala Sismica INGV-Roma 119840521
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-08-04 02:34:17 ± 0.07
Latitude 42.9462 ± 0.0036
Longitude 12.7133 ± 0.0061
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 119840521

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 430
Semi-minor axis of confidence ellipse (meter) 413
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 284
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) 121
Number of associated phases, regardless of their use for origin computation 31
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.55488
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 15
Magnitude information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 119840521
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-08-04 03:27:47
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VIVA.HHZ. 2023-08-04T02:34:53.12 3.0 undecidable manual S -4.61 0
IV.FNVD.HHZ. 2023-08-04T02:34:49.55 3.0 undecidable manual Pg 2.97 0
IV.CING.HHZ. 2023-08-04T02:34:37.21 0.3 undecidable manual S 39 61.5939 50 0.51 62
IV.GUMA.HHZ. 2023-08-04T02:34:34.88 0.6 undecidable manual S 75 52.1034 50 0.72 39
IV.FIAM.HHZ. 2023-08-04T02:34:33.08 3.0 negative manual P 0.74 0
IV.MMO1.EHZ. 2023-08-04T02:34:33.68 0.6 undecidable manual S 96 50.1165 50 0.04 47
IV.ARRO.EHZ. 2023-08-04T02:34:31.57 0.6 undecidable manual S 174 40.9257 50 0.38 45
IV.MURB.HHZ. 2023-08-04T02:34:30.91 0.6 undecidable manual S 337 38.3283 50 0.41 44
IV.CAFI.HHZ. 2023-08-04T02:34:30.63 3.0 undecidable manual P -0.33 0
IV.PIEI.HHZ. 2023-08-04T02:34:29.46 3.0 undecidable manual P -0.12 0
IV.NRCA.HHZ. 2023-08-04T02:34:29.23 0.6 undecidable manual S 111 34.9428 50 -0.35 45
IV.GAVE.EHZ. 2023-08-04T02:34:28.51 0.3 undecidable manual S 152 31.746 50 -0.24 70
IV.CING.HHZ. 2023-08-04T02:34:28.48 0.1 undecidable manual P 39 61.5939 50 -0.03 93
IV.SMA1.EHZ. 2023-08-04T02:34:28.54 0.1 undecidable manual P 124 61.5939 50 0.04 92
IV.FDMO.HHZ. 2023-08-04T02:34:28.23 0.6 undecidable manual S 72 31.9458 50 -0.56 43
IV.GUMA.HHZ. 2023-08-04T02:34:27.27 1.0 positive manual P 75 52.1034 50 0.23 23
IV.ATCC.EHZ. 2023-08-04T02:34:27.03 0.6 undecidable manual S 347 27.1506 108 -0.2 47
IV.MMO1.EHZ. 2023-08-04T02:34:26.54 0.6 negative manual P 96 50.1165 50 -0.2 46
IV.ARRO.EHZ. 2023-08-04T02:34:25.66 0.1 undecidable manual P 174 40.9257 50 0.33 90
IV.SNTG.HHZ. 2023-08-04T02:34:24.80 0.1 undecidable manual P 28 38.9277 50 -0.21 93
IV.NRCA.HHZ. 2023-08-04T02:34:24.08 0.1 negative manual P 111 34.9428 50 -0.32 91
IV.MURB.HHZ. 2023-08-04T02:34:24.75 0.1 undecidable manual P 337 38.3283 50 -0.18 94
IV.FDMO.HHZ. 2023-08-04T02:34:23.85 0.1 undecidable manual P 72 31.9458 50 -0.09 96
IV.CESI.HHZ. 2023-08-04T02:34:23.95 0.6 undecidable manual S 67 16.872 118 0.03 50
IV.GAVE.EHZ. 2023-08-04T02:34:23.80 0.1 undecidable manual P 152 31.746 50 -0.12 96
IV.ASSB.HHZ. 2023-08-04T02:34:22.30 0.6 undecidable manual S 337 11.5773 127 -0.08 50
IT.MTCL.HGZ. 2023-08-04T02:34:22.51 0.1 undecidable manual P 77 23.8539 110 0.1 97
IV.ATCC.EHZ. 2023-08-04T02:34:22.85 0.1 undecidable manual P 347 27.1506 108 -0.19 95
IT.GNU.HGZ. 2023-08-04T02:34:21.68 0.1 undecidable manual P 216 19.6692 114 0.05 99
IV.CESI.HHZ. 2023-08-04T02:34:21.38 0.1 undecidable manual P 67 16.872 118 0.25 96
IV.ASSB.HHZ. 2023-08-04T02:34:20.32 0.1 negative manual P 337 11.5773 127 0.08 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ASSB.HHE. ML:1.8 0.000861 0.2 AML other m 2023-08-04T02:34:22.49
IV.ASSB.HHN. ML:1.8 0.0007465 0.88 AML other m 2023-08-04T02:34:22.45
IV.CESI.HHN. ML:1.6 0.00032450000000000003 0.4 AML other m 2023-08-04T02:34:24.50
IV.CESI.HHE. ML:1.2 0.000155 1.3 AML other m 2023-08-04T02:34:24.92
IV.ATCC.EHE. ML:1.5 0.0001735 0.38 AML other m 2023-08-04T02:34:27.67
IV.ATCC.EHN. ML:1.5 0.0001675 1.64 AML other m 2023-08-04T02:34:27.94
IV.FDMO.HHE. ML:1.2 0.0000732 0.2 AML other m 2023-08-04T02:34:29.00
IV.FDMO.HHN. ML:1.2 0.00006855 1.1 AML other m 2023-08-04T02:34:29.11
IV.GAVE.EHN. ML:1.6 0.000175 0.1 AML other m 2023-08-04T02:34:29.40
IV.GAVE.EHE. ML:1.7 0.000251 0.12 AML other m 2023-08-04T02:34:29.39
IV.NRCA.HHE. ML:1.3 0.00008460000000000001 0.06 AML other m 2023-08-04T02:34:30.70
IV.MURB.HHN. ML:1.9 0.00029499999999999996 1.04 AML other m 2023-08-04T02:34:31.78
IV.NRCA.HHN. ML:1.4 0.0000972 0.86 AML other m 2023-08-04T02:34:31.89
IV.ARRO.EHN. ML:1.1 0.00004285 1.22 AML other m 2023-08-04T02:34:32.82
IV.ARRO.EHE. ML:1.2 0.0000563 1.14 AML other m 2023-08-04T02:34:32.29
IV.MURB.HHE. ML:1.7 0.00018099999999999998 0.84 AML other m 2023-08-04T02:34:32.54
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