Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 21-12-2021 and time 04:58:17 (UTC) in region 4 km NW Ussita (MC)

A magnitude ML 1.0 earthquake occured in region: 4 km NW Ussita (MC), on

  • 21-12-2021 04:58:17 (UTC)
  • 21-12-2021 05:58:17 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.9800, 13.1250 at 13 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
Ussita MC 4 444 444
Visso MC 6 1107 1551
Fiastra MC 7 559 2110
Fiordimonte MC 7 202 2312
Acquacanina MC 7 121 2433
Bolognola MC 9 142 2575
Pieve Torina MC 9 1458 4033
Castelsantangelo sul Nera MC 10 281 4314
Pievebovigliana MC 10 866 5180
Monte Cavallo MC 10 145 5325
Muccia MC 13 915 6240
Preci PG 13 724 6964
Sarnano MC 16 3264 10228
Serravalle di Chienti MC 17 1070 11298
Camerino MC 18 6974 18272
Cessapalombo MC 18 512 18784
Montefortino FM 18 1178 19962
Montemonaco AP 19 604 20566
Amandola FM 19 3629 24195
Sellano PG 19 1079 25274
Caldarola MC 20 1823 27097

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km E of Foligno (57155 inhabitants)
59 Km NW of Teramo (54892 inhabitants)
61 Km NE of Terni (111501 inhabitants)
61 Km E of Perugia (166134 inhabitants)
73 Km NW of L'Aquila (69753 inhabitants)
78 Km SW of Ancona (100861 inhabitants)
97 Km S of Fano (60888 inhabitants)
98 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
Reviewed
Rev100 		ML 1.0 2021-12-21
04:58:17		 42.9802 13.1247 13 2021-12-21
05:18:02		 Sala Sismica INGV-Roma 98778211
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-21 04:58:17 ± 0.09
Latitude 42.9802 ± 0.0036
Longitude 13.1247 ± 0.0037
Depth (km) 13 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 98778211

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 303
Semi-minor axis of confidence ellipse (meter) 295
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 202
Circular confidence region, given by single value of horizontal uncertainty (meter) 300.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 96
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) 0.12
Epicentral distance of station closest to the epicenter (degree) 0.06295
Epicentral distance of station farthest from the epicenter (degree) 0.30577
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:1.0

Field Value
Value 1.0
Uncertainty 0.4
Num. used stations 4
Type of magnitude ML
Reference to an origin 98778211
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-21 05:18:02
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SNTG.HHZ. 2021-12-21T04:58:29.35 0.1 undecidable manual S 334 33.9438 95 -0.04 95
IV.MML1.EHZ. 2021-12-21T04:58:25.58 0.1 undecidable manual S 320 19.2696 104 0.06 99
IV.MMO1.EHZ. 2021-12-21T04:58:25.31 0.1 undecidable manual S 119 18.6702 105 -0.06 98
IV.CESI.HHZ. 2021-12-21T04:58:25.28 0.1 undecidable manual S 279 18.0708 106 0.07 97
IV.SNTG.HHZ. 2021-12-21T04:58:24.61 1.0 positive manual P 334 33.9438 95 0.09 24
IV.CSP1.EHZ. 2021-12-21T04:58:24.26 0.1 undecidable manual S 28 13.9749 116 0.07 100
IV.NRCA.HHZ. 2021-12-21T04:58:24.52 0.1 undecidable manual S 183 16.2726 110 -0.23 96
IV.MC2.EHZ. 2021-12-21T04:58:23.38 0.1 undecidable manual S 146 9.2796 133 0.23 96
IV.CESI.HHZ. 2021-12-21T04:58:22.20 0.6 negative manual P 279 18.0708 106 0.1 49
IV.FDMO.HHZ. 2021-12-21T04:58:22.62 0.1 undecidable manual S 334 6.993 144 -0.12 98
IV.MML1.EHZ. 2021-12-21T04:58:22.09 1.0 undecidable manual P 320 19.2696 104 -0.19 24
IV.MMO1.EHZ. 2021-12-21T04:58:22.19 0.6 undecidable manual P 119 18.6702 105 0 50
IV.CSP1.EHZ. 2021-12-21T04:58:21.41 1.0 negative manual P 28 13.9749 116 -0.1 24
IV.NRCA.HHZ. 2021-12-21T04:58:21.79 1.0 undecidable manual P 183 16.2726 110 -0.05 25
IV.MC2.EHZ. 2021-12-21T04:58:21.11 0.6 undecidable manual P 146 9.2796 133 0.2 48
IV.FDMO.HHZ. 2021-12-21T04:58:20.62 1.0 undecidable manual P 334 6.993 144 -0.06 25
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHN. ML:0.7 0.000060049999999999996 0.1 AML other m 2021-12-21T04:58:22.84
IV.MC2.EHE. ML:1.2 0.0001875 0.12 AML other m 2021-12-21T04:58:23.59
IV.FDMO.HHE. ML:0.7 0.00006625 1.26 AML other m 2021-12-21T04:58:23.01
IV.MC2.EHN. ML:1.5 0.0003265 0.14 AML other m 2021-12-21T04:58:23.80
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