Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 20-09-2023 and time 17:44:29 (UTC) in region 4 km NW Monte Cavallo (MC)

A magnitude ML 0.8 earthquake occured in region: 4 km NW Monte Cavallo (MC), on

  • 20-09-2023 17:44:29 (UTC)
  • 20-09-2023 19:44:29 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.0140, 12.9580 at 14 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Monte Cavallo MC 4 145 145
Serravalle di Chienti MC 7 1070 1215
Pieve Torina MC 8 1458 2673
Muccia MC 11 915 3588
Fiordimonte MC 11 202 3790
Pievebovigliana MC 12 866 4656
Sellano PG 14 1079 5735
Visso MC 14 1107 6842
Sefro MC 15 422 7264
Camerino MC 16 6974 14238
Preci PG 16 724 14962
Fiastra MC 16 559 15521
Ussita MC 17 444 15965
Valtopina PG 17 1398 17363
Nocera Umbra PG 17 5839 23202
Acquacanina MC 18 121 23323
Pioraco MC 19 1134 24457
Fiuminata MC 20 1402 25859

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km E of Foligno (57155 inhabitants)
47 Km E of Perugia (166134 inhabitants)
56 Km NE of Terni (111501 inhabitants)
73 Km NW of Teramo (54892 inhabitants)
81 Km SW of Ancona (100861 inhabitants)
82 Km NW of L'Aquila (69753 inhabitants)
93 Km S of Fano (60888 inhabitants)
96 Km NE of Viterbo (67173 inhabitants)
100 Km S of Pesaro (94582 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 0.8 2023-09-20
17:44:29		 43.0138 12.9577 14 2023-09-20
18:00:19		 Sala Sismica INGV-Roma 121285461
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-20 17:44:29 ± 0.13
Latitude 43.0138 ± 0.0054
Longitude 12.9577 ± 0.0061
Depth (km) 14 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121285461

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 532
Semi-minor axis of confidence ellipse (meter) 377
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 221
Circular confidence region, given by single value of horizontal uncertainty (meter) 530.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 110
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) 0.14
Epicentral distance of station closest to the epicenter (degree) 0.03597
Epicentral distance of station farthest from the epicenter (degree) 0.28868
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:0.8

Field Value
Value 0.8
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 121285461
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-20 18:00:19
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.NRCA.HHZ. 2023-09-20T17:44:38.09 0.6 undecidable manual S 147 23.6541 105 -0.12 48
IV.ASSB.HHZ. 2023-09-20T17:44:38.40 1.0 undecidable manual S 278 24.4533 104 -0.01 24
IV.MML1.EHZ. 2023-09-20T17:44:35.30 0.6 undecidable manual S 6 11.0778 132 0.08 49
IV.ATCC.EHZ. 2023-09-20T17:44:35.74 1.0 undecidable manual P 307 32.0457 99 0.04 24
IV.FEMA.HNZ. 2023-09-20T17:44:35.04 1.0 undecidable manual S 127 9.3795 138 0.14 24
IV.FDMO.HHE. 2023-09-20T17:44:35.12 0.6 undecidable manual S 76 10.7781 133 -0.04 49
IV.ASSB.HHZ. 2023-09-20T17:44:34.49 1.0 undecidable manual P 278 24.4533 104 -0.08 24
IV.CESI.HHE. 2023-09-20T17:44:34.20 0.6 undecidable manual S 257 4.3956 159 0 50
IV.NRCA.HHZ. 2023-09-20T17:44:34.39 0.1 positive manual P 147 23.6541 105 -0.06 97
IT.MTCL.HGZ. 2023-09-20T17:44:33.94 0.6 undecidable manual S 123 3.996 161 -0.22 48
IV.CESI.HHE. 2023-09-20T17:44:32.19 0.1 undecidable manual P 257 4.3956 159 0.06 100
IV.FDMO.HHE. 2023-09-20T17:44:32.74 0.1 undecidable manual P 76 10.7781 133 0.05 99
IT.MTCL.HGZ. 2023-09-20T17:44:32.16 0.1 undecidable manual P 123 3.996 161 0.05 100
IV.MML1.EHZ. 2023-09-20T17:44:32.34 0.6 negative manual P 6 11.0778 132 -0.39 46
IV.FEMA.HNZ. 2023-09-20T17:44:32.97 0.6 undecidable manual P 127 9.3795 138 0.43 46
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MML1.EHN. ML:0.7 0.0000487 1.26 AML other m 2023-09-20T17:44:35.99
IV.MML1.EHE. ML:1.1 0.0001092 0.74 AML other m 2023-09-20T17:44:35.59
IV.ASSB.HHE. ML:0.7 0.0000303 1.24 AML other m 2023-09-20T17:44:38.71
IV.ASSB.HHN. ML:0.8 0.000037250000000000004 1.42 AML other m 2023-09-20T17:44:38.77
IV.NRCA.HHN. ML:0.8 0.000037000000000000005 0.08 AML other m 2023-09-20T17:44:38.96
IV.NRCA.HHE. ML:0.8 0.000035199999999999995 0.36 AML other m 2023-09-20T17:44:40.62
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