Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.4 on date 01-04-2023 and time 22:46:00 (Italy) in region 4 km E Sellano (PG)

A magnitude ML 0.4 earthquake occured in region: 4 km E Sellano (PG), on

  • 01-04-2023 20:46:00 (UTC)
  • 01-04-2023 22:46:00 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8980, 12.9700 at 11 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
Sellano PG 4 1079 1079
Preci PG 6 724 1803
Cerreto di Spoleto PG 10 1075 2878
Visso MC 11 1107 3985
Monte Cavallo MC 11 145 4130
Ussita MC 15 444 4574
Castelsantangelo sul Nera MC 15 281 4855
Norcia PG 15 4957 9812
Vallo di Nera PG 17 364 10176
Pieve Torina MC 18 1458 11634
Campello sul Clitunno PG 18 2442 14076
Trevi PG 18 8469 22545
Fiordimonte MC 18 202 22747
Serravalle di Chienti MC 20 1070 23817

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km E of Foligno (57155 inhabitants)
46 Km NE of Terni (111501 inhabitants)
53 Km E of Perugia (166134 inhabitants)
66 Km W of Teramo (54892 inhabitants)
70 Km NW of L'Aquila (69753 inhabitants)
89 Km NE of Viterbo (67173 inhabitants)
92 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
Bulletin
Rev1000 		ML 0.4 2023-04-01
20:46:00		 42.8975 12.9697 11 2024-03-01
17:18:01		 Bollettino Sismico Italiano INGV 116002101
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-01 20:46:00 ± 0.12
Latitude 42.8975 ± 0.0063
Longitude 12.9697 ± 0.0123
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 116002101

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1041
Semi-minor axis of confidence ellipse (meter) 618
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 69
Circular confidence region, given by single value of horizontal uncertainty (meter) 1040.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 108
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.26980
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 116002101
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-04-03 08:06:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CELB.HHZ. 2023-04-01T20:46:21.66 3.0 positive manual Pn 0.04 0
IV.CSNT.HHZ. 2023-04-01T20:46:15.07 3.0 positive manual Pg 2.3 0
IV.SFI.EHZ. 2023-04-01T20:46:12.31 3.0 positive manual P -0.47 0
IV.ASSB.HHZ. 2023-04-01T20:46:10.38 0.3 undecidable manual S 303 29.9478 50 -0.37 68
IV.MML1.EHZ. 2023-04-01T20:46:09.22 0.3 undecidable manual S 0 23.9538 50 0.06 73
IV.FDMO.HHZ. 2023-04-01T20:46:07.27 0.3 undecidable manual S 32 18.1707 120 -0.25 71
IV.ASSB.HHZ. 2023-04-01T20:46:06.82 0.3 undecidable manual P 303 29.9478 50 0.52 65
IV.NRCA.HHZ. 2023-04-01T20:46:06.13 0.1 undecidable manual S 121 13.7751 128 -0.12 98
IV.CESI.HHZ. 2023-04-01T20:46:06.00 0.3 undecidable manual S 336 13.0758 129 -0.06 74
IV.MML1.EHZ. 2023-04-01T20:46:05.36 0.3 undecidable manual P 0 23.9538 50 -0.02 73
IV.FEMA.HNE. 2023-04-01T20:46:05.18 0.1 undecidable manual S 42 9.6792 138 -0.04 100
IT.MTCL.HGZ. 2023-04-01T20:46:05.35 0.3 undecidable manual S 13 10.9779 134 -0.18 73
IV.GAVE.EHN. 2023-04-01T20:46:05.12 0.3 undecidable manual P 195 23.5542 50 -0.21 71
IV.FDMO.HHZ. 2023-04-01T20:46:04.33 0.1 undecidable manual P 32 18.1707 120 -0.11 97
IV.CESI.HHZ. 2023-04-01T20:46:03.62 0.3 undecidable manual P 336 13.0758 129 0.02 75
IV.FEMA.HNE. 2023-04-01T20:46:03.96 0.1 undecidable manual P 42 9.6792 138 0.86 79
IT.MTCL.HGZ. 2023-04-01T20:46:03.24 0.3 undecidable manual P 13 10.9779 134 -0.04 75
IV.NRCA.HHZ. 2023-04-01T20:46:03.66 0.3 undecidable manual P 121 13.7751 128 -0.05 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHE. ML:0.4 0.00002669544 1.2416 AML other m 2023-04-01T20:46:06.87
IV.CESI.HHN. ML:0.3 0.000020016744999999997 1.9328 AML other m 2023-04-01T20:46:06.14
IV.NRCA.HHN. ML:0.4 0.000027295145 0.2048 AML other m 2023-04-01T20:46:06.25
IV.NRCA.HHE. ML:0.4 0.0000258765 0.0768 AML other m 2023-04-01T20:46:06.41
IV.FDMO.HHN. ML:0.4 0.00002144757 0.2176 AML other m 2023-04-01T20:46:07.54
IV.FDMO.HHE. ML:0.5 0.000024132725000000002 0.192 AML other m 2023-04-01T20:46:07.44
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