Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 04-12-2021 and time 05:45:01 (Italy) in region 4 km SE Sefro (MC)

A magnitude ML 0.8 earthquake occured in region: 4 km SE Sefro (MC), on

  • 04-12-2021 04:45:01 (UTC)
  • 04-12-2021 05:45:01 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.1240, 12.9950 at 11 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
Sefro MC 4 422 422
Camerino MC 6 6974 7396
Muccia MC 6 915 8311
Pioraco MC 6 1134 9445
Serravalle di Chienti MC 7 1070 10515
Fiuminata MC 9 1402 11917
Pieve Torina MC 10 1458 13375
Pievebovigliana MC 10 866 14241
Castelraimondo MC 11 4587 18828
Fiordimonte MC 12 202 19030
Gagliole MC 14 620 19650
Monte Cavallo MC 14 145 19795
Esanatoglia MC 15 2034 21829
Matelica MC 15 9981 31810
Fiastra MC 16 559 32369
Nocera Umbra PG 17 5839 38208
Serrapetrona MC 17 966 39174
Acquacanina MC 18 121 39295
Caldarola MC 19 1823 41118
San Severino Marche MC 19 12726 53844

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km NE of Foligno (57155 inhabitants)
49 Km E of Perugia (166134 inhabitants)
69 Km NE of Terni (111501 inhabitants)
69 Km SW of Ancona (100861 inhabitants)
78 Km NW of Teramo (54892 inhabitants)
80 Km S of Fano (60888 inhabitants)
88 Km S of Pesaro (94582 inhabitants)
92 Km NW of L'Aquila (69753 inhabitants)
98 Km E 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 2021-12-04
04:45:01		 43.124 12.9948 11 2021-12-04
05:15:31		 Sala Sismica INGV-Roma 98111501
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-04 04:45:01 ± 0.05
Latitude 43.1240 ± 0.0018
Longitude 12.9948 ± 0.0025
Depth (km) 11 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 98111501

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 240
Semi-minor axis of confidence ellipse (meter) 170
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 303
Circular confidence region, given by single value of horizontal uncertainty (meter) 240.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 125
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.34804
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 98111501
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-04 05:15:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SSFR.HHZ. 2021-12-04T04:45:14.04 0.3 undecidable manual S 334 38.628 90 0.18 68
IV.CING.HHE. 2021-12-04T04:45:12.31 0.1 undecidable manual S 30 32.2455 90 0.16 92
IV.CRTC.HHZ. 2021-12-04T04:45:10.79 3.0 undecidable manual P 0
IV.SSFR.HHZ. 2021-12-04T04:45:08.34 0.1 undecidable manual P 334 38.628 90 -0.12 96
IV.CSP1.EHZ. 2021-12-04T04:45:08.33 0.1 undecidable manual S 102 17.3715 90 0.16 97
IV.CESI.HHZ. 2021-12-04T04:45:07.71 0.1 undecidable manual S 209 15.0738 90 0.14 98
IV.CING.HHE. 2021-12-04T04:45:07.36 0.3 undecidable manual P 30 32.2455 90 -0.11 72
IV.NRCA.HHE. 2021-12-04T04:45:07.39 0.1 undecidable manual P 163 33.6441 90 -0.29 90
IV.SNTG.HHZ. 2021-12-04T04:45:07.44 0.1 undecidable manual S 343 15.1737 90 -0.15 100
IV.EL6.EHZ. 2021-12-04T04:45:06.20 0.1 undecidable manual P 21 24.3534 90 -0.05 98
IV.FDMO.HHZ. 2021-12-04T04:45:06.82 0.1 undecidable manual S 142 12.2766 106 0 99
IV.CSP1.EHZ. 2021-12-04T04:45:05.21 0.1 undecidable manual P 102 17.3715 90 0.03 99
IV.FDMO.HHZ. 2021-12-04T04:45:04.40 0.1 undecidable manual P 142 12.2766 106 0.01 100
IV.SNTG.HHZ. 2021-12-04T04:45:04.73 0.1 undecidable manual P 343 15.1737 90 -0.11 100
IV.CESI.HHZ. 2021-12-04T04:45:04.86 0.1 undecidable manual P 209 15.0738 90 0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSP1.EHN. ML:1.3 0.00015405 0.58 AML other m 2021-12-04T04:45:08.13
IV.CSP1.EHE. ML:1.3 0.0001715 0.42 AML other m 2021-12-04T04:45:09.73
IV.FDMO.HHE. ML:0.7 0.00004866221 0.3392 AML other m 2021-12-04T04:45:06.95
IV.FDMO.HHN. ML:0.6 0.00004508284 0.5024 AML other m 2021-12-04T04:45:06.96
IV.SNTG.HHE. ML:0.6 0.000036051605 1.36 AML other m 2021-12-04T04:45:07.61
IV.SNTG.HHN. ML:0.7 0.0000454318 1.0784 AML other m 2021-12-04T04:45:07.56
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