Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 28-02-2023 and time 08:47:28 (UTC) in region 4 km NW Valfabbrica (PG)

A magnitude ML 1.2 earthquake occured in region: 4 km NW Valfabbrica (PG), on

  • 28-02-2023 08:47:28 (UTC)
  • 28-02-2023 09:47:28 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.1960, 12.5800 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
Valfabbrica PG 4 3389 3389
Assisi PG 14 28299 31688
Bastia Umbra PG 14 21874 53562
Gualdo Tadino PG 17 15208 68770
Gubbio PG 18 32216 100986
Perugia PG 18 166134 267120
Fossato di Vico PG 19 2840 269960
Nocera Umbra PG 20 5839 275799

Municipalities with at least 50000 inhabitants

An earthquake occurred to
18 Km NE of Perugia (166134 inhabitants)
28 Km NW of Foligno (57155 inhabitants)
64 Km E of Arezzo (99543 inhabitants)
71 Km N of Terni (111501 inhabitants)
80 Km SW of Fano (60888 inhabitants)
84 Km SW of Pesaro (94582 inhabitants)
89 Km SW of Ancona (100861 inhabitants)
95 Km NE of Viterbo (67173 inhabitants)
96 Km S of Rimini (147750 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 1.2 2023-02-28
08:47:28		 43.1955 12.5795 9 2023-02-28
09:41:24		 Sala Sismica INGV-Roma 114876881
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-02-28 08:47:28 ± 0.14
Latitude 43.1955 ± 0.0045
Longitude 12.5795 ± 0.0074
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 114876881

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 701
Semi-minor axis of confidence ellipse (meter) 163
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 230
Circular confidence region, given by single value of horizontal uncertainty (meter) 700.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 155
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
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) 0.04497
Epicentral distance of station farthest from the epicenter (degree) 0.33904
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 114876881
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-02-28 09:41:24
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TB01.DHN.01 2023-02-28T08:47:36.77 0.6 undecidable manual S 331 23.6541 110 -0.06 49
IV.TB02.DHZ. 2023-02-28T08:47:36.69 0.6 undecidable manual S 325 23.754 110 -0.17 48
IV.FRON.EHZ. 2023-02-28T08:47:35.21 1.0 undecidable manual P 18 37.629 50 -0.36 22
IV.ATLO.HNE. 2023-02-28T08:47:35.11 0.6 undecidable manual S 314 19.2696 115 -0.29 47
IV.ASSB.HHZ. 2023-02-28T08:47:34.94 0.6 undecidable manual S 159 18.1707 116 -0.12 49
IV.FOSV.EHE. 2023-02-28T08:47:34.99 0.6 undecidable manual S 53 18.3705 116 -0.14 49
IV.TB01.DHN.01 2023-02-28T08:47:33.77 0.3 undecidable manual P 331 23.6541 110 0.64 63
IV.ATLO.HNE. 2023-02-28T08:47:32.32 0.1 undecidable manual P 314 19.2696 115 0.02 100
IV.ASSB.HHZ. 2023-02-28T08:47:32.08 0.1 undecidable manual P 159 18.1707 116 -0.02 100
IV.TB02.DHZ. 2023-02-28T08:47:32.92 0.1 undecidable manual P 325 23.754 110 -0.22 95
IV.MURB.HHZ. 2023-02-28T08:47:32.40 0.6 undecidable manual S 329 8.6802 135 0.04 50
IV.FOSV.EHE. 2023-02-28T08:47:32.21 0.3 undecidable manual P 53 18.3705 116 0.07 74
IV.ATCC.EHZ. 2023-02-28T08:47:31.44 0.6 undecidable manual S 103 4.995 150 -0.14 50
IV.ATCC.EHZ. 2023-02-28T08:47:30.21 0.1 undecidable manual P 103 4.995 150 0.12 100
IV.MURB.HHZ. 2023-02-28T08:47:30.69 0.1 undecidable manual P 329 8.6802 135 0.15 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ATCC.EHN. ML:1.0 0.0002045 0.08 AML other m 2023-02-28T08:47:31.55
IV.ATCC.EHE. ML:1.1 0.000221301395 0.0832 AML other m 2023-02-28T08:47:31.64
IV.MURB.HHE. ML:1.4 0.0003594777 0.1856 AML other m 2023-02-28T08:47:33.11
IV.MURB.HHN. ML:1.4 0.000406 0.16 AML other m 2023-02-28T08:47:33.26
IV.ATCC.HNE. ML:1.0 0.00020046258499999999 0.16 AML other m 2023-02-28T08:47:31.72
IV.ATCC.HNN. ML:1.1 0.00024166505 0.0768 AML other m 2023-02-28T08:47:31.55
IV.MURB.HNE. ML:1.4 0.0003959552 0.128 AML other m 2023-02-28T08:47:32.95
IV.MURB.HNN. ML:1.3 0.00032030275 0.352 AML other m 2023-02-28T08:47:34.78
IV.ASSB.HHE. ML:1.0 0.00008924679 0.0768 AML other m 2023-02-28T08:47:35.51
IV.ASSB.HHN. ML:1.0 0.000089923065 0.0768 AML other m 2023-02-28T08:47:35.36
IV.FRON.EHE. ML:0.9 0.000031427854999999995 0.9664 AML other m 2023-02-28T08:47:34.80
IV.FRON.EHN. ML:1.2 0.000056983650000000005 1.1584 AML other m 2023-02-28T08:47:36.84
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