Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 23-04-2023 and time 18:04:55 (Italy) in region 2 km SE Ussita (MC)

A magnitude ML 0.9 earthquake occured in region: 2 km SE Ussita (MC), on

  • 23-04-2023 16:04:55 (UTC)
  • 23-04-2023 18:04:55 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9280, 13.1540 at 9 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
Ussita MC 2 444 444
Castelsantangelo sul Nera MC 4 281 725
Visso MC 5 1107 1832
Bolognola MC 10 142 1974
Preci PG 11 724 2698
Acquacanina MC 12 121 2819
Fiastra MC 12 559 3378
Fiordimonte MC 13 202 3580
Monte Cavallo MC 14 145 3725
Montemonaco AP 15 604 4329
Montefortino FM 15 1178 5507
Pieve Torina MC 16 1458 6965
Norcia PG 16 4957 11922
Pievebovigliana MC 16 866 12788
Sarnano MC 17 3264 16052
Montegallo AP 17 523 16575
Amandola FM 18 3629 20204
Sellano PG 19 1079 21283
Muccia MC 19 915 22198

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km E of Foligno (57155 inhabitants)
54 Km NW of Teramo (54892 inhabitants)
58 Km NE of Terni (111501 inhabitants)
65 Km E of Perugia (166134 inhabitants)
67 Km NW of L'Aquila (69753 inhabitants)
82 Km SW of Ancona (100861 inhabitants)
93 Km NW of Montesilvano (53738 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 0.9 2023-04-23
16:04:55		 42.9278 13.1542 9 2024-03-01
17:18:06		 Bollettino Sismico Italiano INGV 117141311
Reviewed
Rev100 		ML 0.8 2023-04-23
16:04:55		 42.9228 13.1433 9 2023-04-23
16:13:17		 Sala Sismica INGV-Roma 116655281
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-23 16:04:55 ± 0.12
Latitude 42.9278 ± 0.0018
Longitude 13.1542 ± 0.0037
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 117141311

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 267
Semi-minor axis of confidence ellipse (meter) 162
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 72
Circular confidence region, given by single value of horizontal uncertainty (meter) 270.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 127
Number of associated phases, regardless of their use for origin computation 36
Number of defining phases 10
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) 0.23113
Number of stations at which the event was observed 29
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.5
Num. used stations 10
Type of magnitude ML
Reference to an origin 117141311
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-05-08 07:10:34

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 116655281
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-23 16:13:17
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CMPR.HHZ. 2023-04-23T16:06:33.64 3.0 undecidable manual Sg 6.2 0
AC.PUK.HHZ. 2023-04-23T16:06:29.00 3.0 undecidable manual Pg 16.41 0
GU.BHB.HHZ. 2023-04-23T16:06:26.13 3.0 undecidable manual Sn -4.44 0
1J.FX12.HHZ.00 2023-04-23T16:06:18.48 3.0 positive manual Pg 8.93 0
IV.PANTE.HHZ. 2023-04-23T16:06:13.46 3.0 undecidable manual Pn -3.15 0
MN.TRI.HHZ. 2023-04-23T16:06:12.17 3.0 undecidable manual Sg 3.38 0
IV.VOBA.EHZ. 2023-04-23T16:06:10.81 3.0 undecidable manual Sg 5.85 0
CR.STON.BHZ. 2023-04-23T16:06:01.00 3.0 undecidable manual Pg 12.26 0
IV.ECTS.HHZ. 2023-04-23T16:06:01.33 3.0 positive manual Pn -7.89 0
IV.MSRU.HHZ. 2023-04-23T16:05:59.78 3.0 undecidable manual Pn -6.59 0
IV.LADO.EHZ. 2023-04-23T16:05:56.86 3.0 undecidable manual Pn -7.41 0
IV.CMPR.HHZ. 2023-04-23T16:05:46.71 3.0 undecidable manual Pg 4.9 0
OT.OT14.EHZ. 2023-04-23T16:05:41.07 3.0 positive manual Pg 7.09 0
IV.MTMR.HNZ. 2023-04-23T16:05:37.97 3.0 positive manual Pg 4.31 0
IV.PTRP.HHZ. 2023-04-23T16:05:37.38 3.0 undecidable manual Pn -8.11 0
IV.PAOL.HNZ. 2023-04-23T16:05:27.73 3.0 undecidable manual Pn -1.67 0
IV.IMOL.HNZ. 2023-04-23T16:05:18.92 3.0 undecidable manual Sn -9.92 0
IV.CSNT.HHZ. 2023-04-23T16:05:04.68 3.0 undecidable manual S -3.83 0
IV.ATFO.HHZ. 2023-04-23T16:05:03.07 3.0 undecidable manual S -1.46 0
IV.IMOL.HNZ. 2023-04-23T16:05:03.84 3.0 undecidable manual P -5.05 0
IV.ASSB.HHZ. 2023-04-23T16:05:02.44 3.0 undecidable manual S -0.88 0
IV.FNVD.HHZ. 2023-04-23T16:05:02.37 3.0 undecidable manual Pn -5.94 0
IV.MF5.EHZ. 2023-04-23T16:05:01.43 0.6 positive manual P 75 25.6521 109 0.13 48
IV.FDMO.HHZ. 2023-04-23T16:05:01.42 0.1 undecidable manual S 336 13.1757 123 0.08 99
IV.MMO1.EHZ. 2023-04-23T16:05:01.64 0.1 undecidable manual S 103 14.3745 121 -0.05 99
IV.NRCA.HHZ. 2023-04-23T16:05:00.69 0.1 undecidable manual S 197 10.9779 128 -0.02 100
IV.MML1.EHZ. 2023-04-23T16:05:00.98 1.0 undecidable manual P 324 25.3524 109 -0.26 23
IV.GUMA.HHZ. 2023-04-23T16:05:00.60 0.6 undecidable manual P 44 20.9679 112 0.19 47
IV.MMO1.EHZ. 2023-04-23T16:04:59.20 0.1 undecidable manual P 103 14.3745 121 -0.03 99
IV.CSP1.EHZ. 2023-04-23T16:04:59.92 0.1 negative manual P 13 18.6702 115 -0.06 98
IV.NRCA.HHZ. 2023-04-23T16:04:58.75 0.1 positive manual P 197 10.9779 128 0.09 99
IV.FDMO.HHZ. 2023-04-23T16:04:58.96 0.1 undecidable manual P 336 13.1757 123 -0.07 99
IV.ASSB.HHZ. 2023-04-23T16:04:53.15 3.0 negative manual P -1.4 0
IV.ARCI.HHZ. 2023-04-23T16:04:53.63 3.0 undecidable manual S -6.23 0
IV.RIBO.EHZ.01 2023-04-23T16:04:53.72 3.0 undecidable manual P -4.5 0
IV.ATFO.HHZ. 2023-04-23T16:04:52.09 3.0 positive manual P -3.14 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.2 0.0002165 0.16 AML other m 2023-04-23T16:05:00.88
IV.NRCA.HHN. ML:0.9 0.00011 0.08 AML other m 2023-04-23T16:05:00.87
IV.FDMO.HHN. ML:0.8 0.00006765 0.2 AML other m 2023-04-23T16:05:01.63
IV.FDMO.HHE. ML:0.5 0.000034 0.2 AML other m 2023-04-23T16:05:01.54
IV.GUMA.HHE. ML:0.9 0.000057499999999999995 0.58 AML other m 2023-04-23T16:05:04.50
IV.GUMA.HHN. ML:0.8 0.0000463 0.56 AML other m 2023-04-23T16:05:04.62
IV.MML1.EHN. ML:0.6 0.0000237 0.24 AML other m 2023-04-23T16:05:05.14
IV.MML1.EHE. ML:0.5 0.00002035 0.92 AML other m 2023-04-23T16:05:05.14
IV.PAOL.HNN. ML:3.5 0.0006599999999999999 1.04 AML other m 2023-04-23T16:05:44.30
IV.PAOL.HNE. ML:3.5 0.0006039999999999999 1.04 AML other m 2023-04-23T16:05:44.30
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