Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 20-09-2023 and time 12:10:50 (Italy) in region 8 km SE Pietralunga (PG)

A magnitude ML 0.9 earthquake occured in region: 8 km SE Pietralunga (PG), on

  • 20-09-2023 10:10:50 (UTC)
  • 20-09-2023 12:10:50 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.3860, 12.4920 at 6 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
Pietralunga PG 8 2111 2111
Gubbio PG 8 32216 34327
Montone PG 13 1680 36007
Scheggia e Pascelupo PG 15 1393 37400
Cantiano PU 15 2245 39645
Umbertide PG 16 16681 56326
Costacciaro PG 18 1216 57542

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km N of Perugia (166134 inhabitants)
50 Km E of Arezzo (99543 inhabitants)
51 Km NW of Foligno (57155 inhabitants)
67 Km SW of Fano (60888 inhabitants)
68 Km SW of Pesaro (94582 inhabitants)
75 Km S of Rimini (147750 inhabitants)
86 Km S of Cesena (96758 inhabitants)
87 Km W of Ancona (100861 inhabitants)
93 Km N of Terni (111501 inhabitants)
94 Km E of Siena (53903 inhabitants)
100 Km SE of Forlì (117913 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 0.9 2023-09-20
10:10:50		 43.3855 12.4915 7 2023-09-20
10:36:58		 Sala Sismica INGV-Roma 121272991
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-20 10:10:50 ± 0.12
Latitude 43.3855 ± 0.0018
Longitude 12.4915 ± 0.0037
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121272991

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 290
Semi-minor axis of confidence ellipse (meter) 29
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 92
Circular confidence region, given by single value of horizontal uncertainty (meter) 290.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 96
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.15378
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 121272991
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-20 10:36:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.NARO.HHZ. 2023-09-20T10:10:59.59 1.0 undecidable manual S 100
IV.PIEI.HHZ. 2023-09-20T10:10:57.09 0.6 undecidable manual S 12 17.0718 111 -0.14 48
IV.MURB.HHZ. 2023-09-20T10:10:56.13 0.6 undecidable manual S 169 13.875 115 -0.08 49
IV.ATLO.EHZ. 2023-09-20T10:10:55.24 0.6 undecidable manual S 221 10.3785 122 0.1 49
IV.ATPC.HHZ. 2023-09-20T10:10:55.59 0.6 undecidable manual S 345 10.878 121 0.28 47
IV.MURB.HHZ. 2023-09-20T10:10:54.05 0.6 undecidable manual P 169 13.875 115 0.08 49
IV.ATVO.HHZ. 2023-09-20T10:10:54.02 0.6 undecidable manual S 267 6.8931 134 -0.16 49
IV.PIEI.HHZ. 2023-09-20T10:10:54.38 1.0 undecidable manual P 12 17.0718 111 -0.17 24
IV.ATFO.HHZ. 2023-09-20T10:10:54.20 0.6 undecidable manual S 108 6.7932 134 0.04 50
IV.ATLO.EHZ. 2023-09-20T10:10:53.41 0.1 undecidable manual P 221 10.3785 122 0.06 99
IV.ATPC.HHZ. 2023-09-20T10:10:53.47 0.1 undecidable manual P 345 10.878 121 0.02 99
IV.ATFO.HHZ. 2023-09-20T10:10:52.77 0.1 positive manual P 108 6.7932 134 -0.01 100
IV.ATVO.HHZ. 2023-09-20T10:10:52.71 0.1 negative manual P 267 6.8931 134 -0.08 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ATVO.HHE. ML:1.0 0.00010341819499999998 0.16 AML other m 2023-09-20T10:10:54.29
IV.ATVO.HHN. ML:0.9 0.00009295000000000001 0.16 AML other m 2023-09-20T10:10:54.06
IV.ATFO.HHN. ML:0.8 0.00007642211 0.16 AML other m 2023-09-20T10:10:54.45
IV.ATFO.HHE. ML:1.0 0.00007853848499999999 0.1408 AML other m 2023-09-20T10:10:54.68
IV.MURB.HHE. ML:0.8 0.000073523965 0.1024 AML other m 2023-09-20T10:10:57.07
IV.MURB.HHN. ML:0.7 0.0000582 0.2 AML other m 2023-09-20T10:10:57.27
IV.ATVO.HNE. ML:0.0 0.00011184767499999999 0.1728 AML other m 2023-09-20T10:10:54.30
IV.ATVO.HNN. ML:0.0 0.00010279585 0.544 AML other m 2023-09-20T10:10:57.38
IV.ATFO.HNE. ML:0.0 0.00008616057 0.1408 AML other m 2023-09-20T10:10:54.68
IV.ATFO.HNN. ML:0.0 0.0001005278 0.5504 AML other m 2023-09-20T10:10:58.49
IV.MURB.HNE. ML:0.9 0.000098318 0.416 AML other m 2023-09-20T10:11:05.51
IV.MURB.HNN. ML:1.0 0.000120318725 0.3776 AML other m 2023-09-20T10:11:03.17
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