Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 31-12-2023 and time 16:18:40 (Italy) in region 5 km NW Monte Cavallo (MC)

A magnitude ML 0.8 earthquake occured in region: 5 km NW Monte Cavallo (MC), on

  • 31-12-2023 15:18:40 (UTC)
  • 31-12-2023 16:18:40 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.0190, 12.9440 at 8 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
Monte Cavallo MC 6 145 145
Serravalle di Chienti MC 6 1070 1215
Pieve Torina MC 9 1458 2673
Muccia MC 11 915 3588
Fiordimonte MC 12 202 3790
Pievebovigliana MC 13 866 4656
Sefro MC 14 422 5078
Sellano PG 15 1079 6157
Visso MC 15 1107 7264
Valtopina PG 16 1398 8662
Nocera Umbra PG 16 5839 14501
Camerino MC 17 6974 21475
Preci PG 17 724 22199
Fiastra MC 17 559 22758
Ussita MC 18 444 23202
Pioraco MC 18 1134 24336
Acquacanina MC 19 121 24457
Fiuminata MC 19 1402 25859

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km E of Foligno (57155 inhabitants)
46 Km E of Perugia (166134 inhabitants)
56 Km NE of Terni (111501 inhabitants)
74 Km NW of Teramo (54892 inhabitants)
81 Km SW of Ancona (100861 inhabitants)
83 Km NW of L'Aquila (69753 inhabitants)
92 Km S of Fano (60888 inhabitants)
96 Km NE of Viterbo (67173 inhabitants)
99 Km S of Pesaro (94582 inhabitants)
99 Km SE of Arezzo (99543 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 2023-12-31
15:18:40		 43.0193 12.9442 8 2023-12-31
15:23:05		 Sala Sismica INGV-Roma 124377451
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-12-31 15:18:40 ± 0.26
Latitude 43.0193 ± 0.0081
Longitude 12.9442 ± 0.0086
Depth (km) 8 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 124377451

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 929
Semi-minor axis of confidence ellipse (meter) 207
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 188
Circular confidence region, given by single value of horizontal uncertainty (meter) 930.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 97
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.03238
Epicentral distance of station farthest from the epicenter (degree) 0.26890
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 124377451
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-12-31 15:23:05
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2023-12-31T15:18:48.42 0.6 undecidable manual S 69 22.6551 110 -0.43 44
IV.NRCA.HHZ. 2023-12-31T15:18:48.79 0.6 undecidable manual S 146 24.8529 108 -0.79 39
IV.ASSB.HHZ. 2023-12-31T15:18:48.50 0.6 undecidable manual S 276 23.2545 109 -0.57 43
7F.SIB1.HNZ. 2023-12-31T15:18:47.13 0.3 undecidable manual P 117 29.8479 105 0.42 66
IV.MC2.EHZ. 2023-12-31T15:18:46.24 0.3 undecidable manual P 121 23.1546 109 0.8 58
IV.NRCA.HHZ. 2023-12-31T15:18:45.10 1.0 undecidable manual P 146 24.8529 108 -0.64 21
IV.FDMO.HHZ. 2023-12-31T15:18:45.26 0.6 undecidable manual S 81 11.7771 125 -0.22 47
IV.ASSB.HHZ. 2023-12-31T15:18:45.49 1.0 negative manual P 276 23.2545 109 0.03 24
IV.CSP1.EHZ. 2023-12-31T15:18:45.02 1.0 negative manual P 69 22.6551 110 -0.31 23
IV.MML1.EHZ. 2023-12-31T15:18:45.30 0.6 undecidable manual S 12 10.6782 128 0.12 49
IV.MML1.EHZ. 2023-12-31T15:18:43.25 0.6 positive manual P 12 10.6782 128 0.04 49
IT.MTCL.HGZ. 2023-12-31T15:18:43.87 0.6 undecidable manual S 122 5.2947 147 -0.03 50
IV.FDMO.HHZ. 2023-12-31T15:18:43.29 0.6 positive manual P 81 11.7771 125 -0.09 49
IV.CESI.HHZ. 2023-12-31T15:18:43.84 0.6 undecidable manual S 243 3.5964 156 0.22 48
IV.CESI.HHZ. 2023-12-31T15:18:42.47 0.1 negative manual P 243 3.5964 156 0.17 97
IT.MTCL.HGZ. 2023-12-31T15:18:42.48 0.1 undecidable manual P 122 5.2947 147 0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MML1.EHN. ML:0.7 0.0000669 0.3 AML other m 2023-12-31T15:18:45.54
IV.MML1.EHE. ML:0.8 0.00008340000000000001 0.26 AML other m 2023-12-31T15:18:45.56
IV.NRCA.HHE. ML:0.8 0.00003935 0.1 AML other m 2023-12-31T15:18:49.04
IV.NRCA.HHN. ML:1.0 0.00005830000000000001 0.4 AML other m 2023-12-31T15:18:49.00
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