Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 28-04-2023 and time 09:32:38 (Italy) in region 3 km N Castel Ritaldi (PG)

A magnitude ML 1.8 earthquake occured in region: 3 km N Castel Ritaldi (PG), on

  • 28-04-2023 07:32:38 (UTC)
  • 28-04-2023 09:32:38 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8520, 12.6730 at 10 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
Castel Ritaldi PG 3 3278 3278
Montefalco PG 5 5679 8957
Trevi PG 7 8469 17426
Giano dell'Umbria PG 8 3846 21272
Campello sul Clitunno PG 9 2442 23714
Bevagna PG 11 5081 28795
Gualdo Cattaneo PG 12 6155 34950
Foligno PG 12 57155 92105
Spoleto PG 14 38218 130323
Massa Martana PG 15 3770 134093
Spello PG 16 8645 142738
Cannara PG 18 4305 147043
Vallo di Nera PG 18 364 147407
Sant'Anatolia di Narco PG 19 564 147971
Collazzone PG 20 3473 151444

Municipalities with at least 50000 inhabitants

An earthquake occurred to
12 Km S of Foligno (57155 inhabitants)
32 Km N of Terni (111501 inhabitants)
37 Km SE of Perugia (166134 inhabitants)
67 Km NE of Viterbo (67173 inhabitants)
81 Km NW of L'Aquila (69753 inhabitants)
87 Km W of Teramo (54892 inhabitants)
94 Km SE of Arezzo (99543 inhabitants)
95 Km N of Guidonia Montecelio (88673 inhabitants)
99 Km N of Tivoli (56533 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 2023-04-28
07:32:38		 42.8517 12.6733 10 2024-03-01
17:18:08		 Bollettino Sismico Italiano INGV 117380041
Reviewed
Rev100 		ML 1.8 2023-04-28
07:32:38		 42.8535 12.6652 10 2023-04-28
07:42:07		 Sala Sismica INGV-Roma 116827041
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-28 07:32:38 ± 0.03
Latitude 42.8517 ± 0.0018
Longitude 12.6733 ± 0.0025
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 117380041

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 177
Semi-minor axis of confidence ellipse (meter) 167
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 146
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) 48
Number of associated phases, regardless of their use for origin computation 50
Number of defining phases 49
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.14
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.64751
Number of stations at which the event was observed 32
Number of stations from which data was used for origin computation 31
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 42
Type of magnitude ML
Reference to an origin 116827041
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-28 07:42:07

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 44
Type of magnitude ML
Reference to an origin 117380041
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-05-15 13:12:48
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.POPM.HHZ. 2023-04-28T07:33:11.37 3.0 undecidable manual Pn 1.49 0
IV.CSP1.EHZ. 2023-04-28T07:32:55.06 0.6 undecidable manual S 58 50.7159 50 0.33 44
IV.MMO1.EHZ. 2023-04-28T07:32:55.63 0.3 undecidable manual S 84 53.4021 50 0.19 68
IV.MGAB.HHZ. 2023-04-28T07:32:53.79 0.3 undecidable manual S 279 46.1205 50 0.28 67
7F.SIB3.EHZ. 2023-04-28T07:32:53.94 0.6 undecidable manual S 87 48.618 50 -0.22 45
IV.LNSS.HHZ. 2023-04-28T07:32:52.15 0.3 undecidable manual S 133 40.7259 50 0.09 70
IV.MML1.EHZ. 2023-04-28T07:32:51.24 0.3 undecidable manual S 40 37.8288 50 -0.05 71
IV.FDMO.HHZ. 2023-04-28T07:32:51.68 0.3 undecidable manual S 58 39.3273 50 -0.03 72
IV.CING.HHZ. 2023-04-28T07:32:51.39 0.1 undecidable manual P 36 71.8725 50 0.31 85
IV.MF5.EHZ. 2023-04-28T07:32:50.42 0.6 undecidable manual P 76 65.6898 50 0.3 43
IV.NRCA.HHZ. 2023-04-28T07:32:50.86 0.3 undecidable manual S 93 35.9418 50 0.08 71
IV.ATCC.EHZ. 2023-04-28T07:32:50.80 0.3 undecidable manual S 356 37.1295 50 -0.3 68
IV.FEMA.HNZ. 2023-04-28T07:32:50.09 0.6 undecidable manual S 68 32.9448 50 0.1 48
IV.ATMI.HHZ. 2023-04-28T07:32:49.87 0.6 undecidable manual P 329 62.7927 50 0.19 44
IT.MTCL.HGZ. 2023-04-28T07:32:49.19 0.6 undecidable manual S 59 30.8469 50 -0.24 46
IV.SMA1.EHZ. 2023-04-28T07:32:49.20 0.1 undecidable manual P 114 59.1963 50 0.06 91
IV.EL6.EHZ. 2023-04-28T07:32:49.77 0.1 undecidable manual P 33 63.3921 50 0 92
IV.GUMA.HHZ. 2023-04-28T07:32:49.33 0.6 undecidable manual P 66 58.5969 50 0.29 44
IV.TB02.DHZ.01 2023-04-28T07:32:49.41 0.6 undecidable manual P 340 61.3941 50 -0.06 46
IV.ARRO.EHZ. 2023-04-28T07:32:49.61 0.3 undecidable manual S 166 31.1466 50 0.1 71
IV.MMO1.EHZ. 2023-04-28T07:32:48.16 0.3 undecidable manual P 84 53.4021 50 -0.07 69
IV.ATLO.EHE. 2023-04-28T07:32:48.87 0.1 undecidable manual P 337 55.7997 50 0.27 88
IV.RM33.EHZ. 2023-04-28T07:32:48.88 0.1 undecidable manual P 131 58.1973 50 -0.1 91
IV.CESX.HHZ. 2023-04-28T07:32:48.31 0.3 undecidable manual S 195 27.8499 109 -0.28 69
IV.ATVA.EHE. 2023-04-28T07:32:48.59 0.1 undecidable manual P 327 56.8986 50 -0.18 90
IV.CSP1.EHZ. 2023-04-28T07:32:47.83 0.6 undecidable manual P 58 50.7159 50 0.01 47
7F.SIB3.EHZ. 2023-04-28T07:32:47.18 0.1 undecidable manual P 87 48.618 50 -0.31 88
IV.CESI.HHZ. 2023-04-28T07:32:47.80 0.3 undecidable manual S 48 25.3524 110 0.04 73
IV.GAVE.EHZ. 2023-04-28T07:32:47.87 0.3 undecidable manual S 134 25.2525 111 0.15 72
IV.FOSV.HNZ. 2023-04-28T07:32:47.81 0.1 undecidable manual P 8 49.7169 50 0.15 91
IV.MURB.HHZ. 2023-04-28T07:32:47.23 0.1 undecidable manual P 345 47.2194 50 -0.05 94
IV.SNTG.HHZ. 2023-04-28T07:32:47.78 0.1 undecidable manual P 26 49.7169 50 0.11 92
IV.LNSS.HHZ. 2023-04-28T07:32:46.18 0.1 undecidable manual P 133 40.7259 50 -0.09 94
IV.MGAB.HHZ. 2023-04-28T07:32:46.93 0.6 undecidable manual P 279 46.1205 50 -0.18 46
IV.ASSB.HHZ. 2023-04-28T07:32:46.54 0.3 undecidable manual S 357 21.2676 114 0.1 73
IV.ATCC.EHZ. 2023-04-28T07:32:45.45 0.1 undecidable manual P 356 37.1295 50 -0.27 91
IV.FDMO.HHZ. 2023-04-28T07:32:45.97 0.6 negative manual P 58 39.3273 50 -0.1 47
IV.FEMA.HNZ. 2023-04-28T07:32:45.03 0.1 undecidable manual P 68 32.9448 50 -0.05 96
IV.NRCA.HHZ. 2023-04-28T07:32:45.41 0.1 negative manual P 93 35.9418 50 -0.13 94
IV.MML1.EHZ. 2023-04-28T07:32:45.66 0.1 undecidable manual P 40 37.8288 50 -0.17 93
IV.CESX.HHZ. 2023-04-28T07:32:44.31 0.3 undecidable manual P 195 27.8499 109 0.04 73
IV.ARRO.EHZ. 2023-04-28T07:32:44.96 0.3 undecidable manual P 166 31.1466 50 0.16 71
IT.MTCL.HGZ. 2023-04-28T07:32:44.57 0.3 undecidable manual P 59 30.8469 50 -0.19 70
IV.ASSB.HHZ. 2023-04-28T07:32:43.05 0.3 undecidable manual P 357 21.2676 114 0.02 74
IV.CESI.HHZ. 2023-04-28T07:32:43.78 0.1 undecidable manual P 48 25.3524 110 -0.02 98
IV.MOMA.HHZ. 2023-04-28T07:32:43.05 0.3 undecidable manual S 238 9.879 134 -0.08 74
IV.GAVE.EHZ. 2023-04-28T07:32:43.78 0.1 undecidable manual P 134 25.2525 111 0.01 98
IT.GNU.HGZ. 2023-04-28T07:32:43.16 0.3 undecidable manual S 238 9.879 134 0.03 75
IV.MOMA.HHZ. 2023-04-28T07:32:41.17 0.1 undecidable manual P 238 9.879 134 0.05 100
IT.GNU.HGZ. 2023-04-28T07:32:41.19 0.3 undecidable manual P 238 9.879 134 0.07 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HNN. ML:2.1 0.0015750000000000002 0.38 AML other m 2023-04-28T07:32:43.36
IV.MOMA.HHN. ML:1.7 0.0006439999999999999 0.4 AML other m 2023-04-28T07:32:43.37
IV.MOMA.HHE. ML:1.9 0.001108 1.24 AML other m 2023-04-28T07:32:44.75
IV.MOMA.HNE. ML:1.9 0.001064 1.22 AML other m 2023-04-28T07:32:44.75
IV.ASSB.HHN. ML:1.4 0.0001955 1.54 AML other m 2023-04-28T07:32:46.16
IV.CESI.HHE. ML:1.5 0.0001905 1.2 AML other m 2023-04-28T07:32:48.96
IV.ASSB.HHE. ML:1.5 0.00020850000000000003 0.2 AML other m 2023-04-28T07:32:48.36
IV.CESX.HHN. ML:2.0 0.00046699999999999997 1.64 AML other m 2023-04-28T07:32:48.97
IV.CESX.HHE. ML:1.8 0.000313 0.44 AML other m 2023-04-28T07:32:49.74
IV.GAVE.EHE. ML:2.1 0.00075 0.5 AML other m 2023-04-28T07:32:49.55
IV.ARRO.EHE. ML:1.8 0.00028849999999999997 1.5 AML other m 2023-04-28T07:32:50.20
IV.GAVE.EHN. ML:2.0 0.0006359999999999998 0.96 AML other m 2023-04-28T07:32:50.38
IV.CESI.HHN. ML:1.8 0.0003395 1.78 AML other m 2023-04-28T07:32:50.95
IV.NRCA.HHN. ML:1.9 0.0003005 1.9 AML other m 2023-04-28T07:32:51.97
IV.ATCC.EHE. ML:1.6 0.0001635 0.4 AML other m 2023-04-28T07:32:52.17
IV.NRCA.HHE. ML:1.9 0.00033499999999999996 0.7 AML other m 2023-04-28T07:32:52.36
IV.FDMO.HHE. ML:1.6 0.000126 0.16 AML other m 2023-04-28T07:32:52.72
IV.MML1.EHE. ML:1.4 0.00009925 0.3 AML other m 2023-04-28T07:32:53.82
IV.ARRO.EHN. ML:1.7 0.000234 0.66 AML other m 2023-04-28T07:32:53.36
IV.FDMO.HHN. ML:1.6 0.00012345 0.88 AML other m 2023-04-28T07:32:53.72
IV.MML1.EHN. ML:1.3 0.0000701 0.28 AML other m 2023-04-28T07:32:54.27
IV.LNSS.HHN. ML:2.1 0.00046699999999999997 0.26 AML other m 2023-04-28T07:32:54.29
IV.LNSS.HHE. ML:2.1 0.00039400000000000004 0.42 AML other m 2023-04-28T07:32:54.15
IV.MGAB.HHE. ML:1.4 0.0000805 0.72 AML other m 2023-04-28T07:32:55.26
IV.CSP1.EHN. ML:2.1 0.000314 0.18 AML other m 2023-04-28T07:32:55.36
IV.ATCC.EHN. ML:1.5 0.000125 0.48 AML other m 2023-04-28T07:32:55.47
IV.CSP1.EHE. ML:2.1 0.0003195 0.42 AML other m 2023-04-28T07:32:55.38
IV.MURB.HNE. ML:2.0 0.0002585 0.64 AML other m 2023-04-28T07:32:56.07
IV.MGAB.HHN. ML:1.4 0.00007935 1.14 AML other m 2023-04-28T07:32:56.22
IV.MURB.HHE. ML:1.9 0.000234 0.3 AML other m 2023-04-28T07:32:56.52
IV.MMO1.EHN. ML:2.3 0.00044950000000000003 0.2 AML other m 2023-04-28T07:32:56.62
IV.MMO1.EHE. ML:2.3 0.00044899999999999996 1.28 AML other m 2023-04-28T07:32:56.67
IV.GUMA.HHN. ML:2.2 0.00029900000000000006 0.22 AML other m 2023-04-28T07:32:58.22
IV.MURB.HHN. ML:2.0 0.00029 0.26 AML other m 2023-04-28T07:32:58.23
IV.MURB.HNN. ML:2.0 0.00026450000000000003 0.26 AML other m 2023-04-28T07:32:58.10
IV.GUMA.HHE. ML:2.3 0.000428 0.24 AML other m 2023-04-28T07:32:58.19
IV.SMA1.EHN. ML:1.8 0.0001296 0.66 AML other m 2023-04-28T07:32:58.43
IV.RM33.EHN. ML:1.8 0.000131 0.24 AML other m 2023-04-28T07:32:58.71
IV.SMA1.EHE. ML:1.9 0.00017749999999999998 0.86 AML other m 2023-04-28T07:32:59.92
IV.RM33.EHE. ML:1.7 0.00011714999999999999 0.44 AML other m 2023-04-28T07:33:00.54
IV.MF5.EHE. ML:1.8 0.00011 0.22 AML other m 2023-04-28T07:33:01.19
IV.MF5.EHN. ML:1.7 0.00009609999999999999 1.06 AML other m 2023-04-28T07:33:02.65
IV.CING.HHN. ML:1.5 0.000054449999999999995 0.38 AML other m 2023-04-28T07:33:02.32
IV.CING.HHE. ML:1.3 0.000029949999999999996 0.82 AML other m 2023-04-28T07:33:02.42
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