Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 04-12-2021 and time 15:30:47 (UTC) in region 5 km N Ussita (MC)

A magnitude ML 1.1 earthquake occured in region: 5 km N Ussita (MC), on

  • 04-12-2021 15:30:47 (UTC)
  • 04-12-2021 16:30:47 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.9880, 13.1220 at 6 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 5 444 444
Fiordimonte MC 6 202 646
Fiastra MC 6 559 1205
Acquacanina MC 6 121 1326
Visso MC 7 1107 2433
Pieve Torina MC 9 1458 3891
Bolognola MC 9 142 4033
Pievebovigliana MC 9 866 4899
Monte Cavallo MC 10 145 5044
Castelsantangelo sul Nera MC 11 281 5325
Muccia MC 12 915 6240
Preci PG 14 724 6964
Sarnano MC 16 3264 10228
Serravalle di Chienti MC 17 1070 11298
Camerino MC 17 6974 18272
Cessapalombo MC 18 512 18784
Montefortino FM 19 1178 19962
Caldarola MC 19 1823 21785
Amandola FM 19 3629 25414
Sellano PG 19 1079 26493
Montemonaco AP 19 604 27097
Gualdo MC 20 815 27912
Camporotondo di Fiastrone MC 20 563 28475

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km E of Foligno (57155 inhabitants)
60 Km NW of Teramo (54892 inhabitants)
61 Km E of Perugia (166134 inhabitants)
61 Km NE of Terni (111501 inhabitants)
74 Km NW of L'Aquila (69753 inhabitants)
77 Km SW of Ancona (100861 inhabitants)
96 Km S of Fano (60888 inhabitants)
99 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 1.1 2021-12-04
15:30:47		 42.9883 13.1217 6 2021-12-04
15:46:49		 Sala Sismica INGV-Roma 98135041
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-04 15:30:47 ± 0.11
Latitude 42.9883 ± 0.0027
Longitude 13.1217 ± 0.0037
Depth (km) 6 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 98135041

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 310
Semi-minor axis of confidence ellipse (meter) 59
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 248
Circular confidence region, given by single value of horizontal uncertainty (meter) 310.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 117
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 13
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.16637
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 98135041
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-04 15:46:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PP3.EHZ. 2021-12-04T15:31:07.01 3.0 undecidable manual S -1.78 0
IV.EL6.EHZ. 2021-12-04T15:30:56.93 3.0 negative manual P 1.62 0
IV.PF6.EHZ. 2021-12-04T15:30:54.11 0.3 undecidable manual S 20 17.5713 109 -0.03 75
IV.MML1.EHZ. 2021-12-04T15:30:54.57 0.3 undecidable manual S 319 18.4704 108 0.15 73
IV.CESI.HHZ. 2021-12-04T15:30:54.37 0.3 undecidable manual S 276 17.6712 109 0.2 72
IV.MF5.EHZ. 2021-12-04T15:30:53.49 3.0 positive manual P 0.88 0
IV.CSP1.EHZ. 2021-12-04T15:30:52.84 0.3 undecidable manual S 30 13.2756 114 0.08 74
IV.MC2.EHZ. 2021-12-04T15:30:52.04 0.3 undecidable manual S 147 10.0788 121 0.26 72
IV.CESI.HHZ. 2021-12-04T15:30:51.39 0.3 undecidable manual P 276 17.6712 109 -0.04 75
IV.PF6.EHZ. 2021-12-04T15:30:51.54 1.0 undecidable manual P 20 17.5713 109 0.13 24
IV.NRCA.HHZ. 2021-12-04T15:30:51.12 0.3 undecidable manual P 182 17.1717 109 -0.21 72
IV.MML1.EHZ. 2021-12-04T15:30:51.52 0.1 undecidable manual P 319 18.4704 108 -0.05 99
IV.CSP1.EHZ. 2021-12-04T15:30:50.66 0.1 undecidable manual P 30 13.2756 114 0.05 100
IV.FDMO.HHZ. 2021-12-04T15:30:50.49 0.1 undecidable manual S 332 5.994 135 -0.16 99
IV.FDMO.HHZ. 2021-12-04T15:30:49.31 0.3 undecidable manual P 332 5.994 135 -0.08 75
IV.MC2.EHZ. 2021-12-04T15:30:49.94 0.1 undecidable manual P 147 10.0788 121 -0.1 99
IV.FEMA.HNZ. 2021-12-04T15:30:48.34 3.0 undecidable manual P 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSP1.EHN. ML:1.5 0.000423 0.6 AML other m 2021-12-04T15:30:53.14
IV.CSP1.EHE. ML:1.3 0.00023 1.04 AML other m 2021-12-04T15:30:53.41
IV.NRCA.HHN. ML:1.0 0.000095 0.16 AML other m 2021-12-04T15:30:54.75
IV.CESI.HHE. ML:1.1 0.0001116 1.8 AML other m 2021-12-04T15:30:55.94
IV.CESI.HHN. ML:1.1 0.00011195000000000001 0.36 AML other m 2021-12-04T15:30:55.27
IV.MML1.EHN. ML:0.9 0.0000708 0.14 AML other m 2021-12-04T15:30:55.34
IV.MML1.EHE. ML:0.8 0.00004765 1.06 AML other m 2021-12-04T15:30:55.00
IV.NRCA.HHE. ML:1.1 0.000118 0.12 AML other m 2021-12-04T15:30:56.09
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