Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 18-12-2021 and time 00:04:20 (UTC) in region 5 km NE Ussita (MC)

A magnitude ML 0.8 earthquake occured in region: 5 km NE Ussita (MC), on

  • 18-12-2021 00:04:20 (UTC)
  • 18-12-2021 01:04:20 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.9840, 13.1570 at 14 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Acquacanina MC 5 121 565
Bolognola MC 6 142 707
Fiastra MC 6 559 1266
Visso MC 8 1107 2373
Fiordimonte MC 8 202 2575
Castelsantangelo sul Nera MC 10 281 2856
Pievebovigliana MC 11 866 3722
Pieve Torina MC 11 1458 5180
Monte Cavallo MC 13 145 5325
Sarnano MC 13 3264 8589
Muccia MC 14 915 9504
Preci PG 15 724 10228
Montefortino FM 16 1178 11406
Amandola FM 16 3629 15035
Cessapalombo MC 16 512 15547
Montemonaco AP 17 604 16151
Gualdo MC 18 815 16966
Caldarola MC 18 1823 18789
Camerino MC 18 6974 25763
Camporotondo di Fiastrone MC 19 563 26326
San Ginesio MC 19 3498 29824
Serravalle di Chienti MC 19 1070 30894

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km E of Foligno (57155 inhabitants)
57 Km NW of Teramo (54892 inhabitants)
63 Km NE of Terni (111501 inhabitants)
64 Km E of Perugia (166134 inhabitants)
73 Km N of L'Aquila (69753 inhabitants)
76 Km SW of Ancona (100861 inhabitants)
96 Km S of Fano (60888 inhabitants)
96 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
Bulletin
Rev1000 		ML 0.8 2021-12-18
00:04:20		 42.9838 13.157 14 2022-03-30
13:04:23		 Bollettino Sismico Italiano INGV 98786271
Reviewed
Rev100 		ML 1.0 2021-12-18
00:04:20		 42.9843 13.1627 15 2021-12-18
01:11:16		 Sala Sismica INGV-Roma 98635771
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-18 00:04:20 ± 0.09
Latitude 42.9838 ± 0.0036
Longitude 13.1570 ± 0.0049
Depth (km) 14 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 98786271

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 398
Semi-minor axis of confidence ellipse (meter) 117
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 17
Circular confidence region, given by single value of horizontal uncertainty (meter) 400.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 63
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 23
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.07374
Epicentral distance of station farthest from the epicenter (degree) 0.22123
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 98786271
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-21 10:40:58

ML:1.0

Field Value
Value 1.0
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 98635771
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-18 01:11:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MF5.EHZ. 2021-12-18T00:04:30.21 0.3 undecidable manual S 89 24.5532 103 0.47 65
IV.MML1.EHZ. 2021-12-18T00:04:28.82 0.3 undecidable manual S 314 20.7681 107 0.05 74
IV.CESI.HHZ. 2021-12-18T00:04:28.92 0.3 undecidable manual S 277 20.6682 107 0.2 73
IV.MMO1.EHZ. 2021-12-18T00:04:27.42 0.3 undecidable manual S 124 16.6722 115 -0.32 71
IV.PF6.EHZ. 2021-12-18T00:04:27.60 0.3 undecidable manual S 10 17.3715 113 -0.3 71
IV.NRCA.HHZ. 2021-12-18T00:04:27.64 0.3 undecidable manual S 192 17.0718 114 -0.18 72
IV.CSP1.EHZ. 2021-12-18T00:04:26.86 0.3 undecidable manual S 18 12.5763 126 0.06 74
IT.MTCL.HGZ. 2021-12-18T00:04:26.77 0.6 undecidable manual S 275 12.876 125 -0.08 49
IV.MC2.EHZ. 2021-12-18T00:04:26.31 0.3 undecidable manual S 162 8.4804 140 0.33 71
IV.FEMA.HNZ. 2021-12-18T00:04:26.40 0.3 undecidable manual S 255 8.9799 138 0.31 72
IV.MF5.EHZ. 2021-12-18T00:04:26.01 0.3 undecidable manual P 89 24.5532 103 0.11 72
IV.FDMO.HHZ. 2021-12-18T00:04:25.93 0.3 undecidable manual S 316 8.1807 142 0 76
IV.CESI.HHZ. 2021-12-18T00:04:25.28 0.3 undecidable manual P 277 20.6682 107 -0.03 73
IV.MML1.EHZ. 2021-12-18T00:04:25.43 0.3 undecidable manual P 314 20.7681 107 0.09 73
IV.MMO1.EHZ. 2021-12-18T00:04:24.56 0.3 undecidable manual P 124 16.6722 115 -0.18 73
IV.PF6.EHZ. 2021-12-18T00:04:24.55 0.1 undecidable manual P 10 17.3715 113 -0.29 95
IV.NRCA.HHZ. 2021-12-18T00:04:24.62 0.1 undecidable manual P 192 17.0718 114 -0.17 96
IV.CSP1.EHZ. 2021-12-18T00:04:24.13 0.1 undecidable manual P 18 12.5763 126 -0.07 100
IV.GUMA.HHZ. 2021-12-18T00:04:24.80 0.3 undecidable manual P 59 16.872 114 0.03 74
IT.MTCL.HGZ. 2021-12-18T00:04:24.18 0.1 undecidable manual P 275 12.876 125 -0.05 99
IV.FDMO.HHZ. 2021-12-18T00:04:23.64 0.1 undecidable manual P 316 8.1807 142 -0.06 100
IV.MC2.EHZ. 2021-12-18T00:04:23.88 0.1 positive manual P 162 8.4804 140 0.15 98
IV.FEMA.HNZ. 2021-12-18T00:04:23.85 0.3 undecidable manual P 255 8.9799 138 0.06 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.0 0.00007950000000000001 0.6 AML other m 2021-12-18T00:04:27.64
IV.NRCA.HHN. ML:0.9 0.000058450000000000005 1.04 AML other m 2021-12-18T00:04:28.45
IV.FDMO.HHN. ML:0.8 0.00006593383 0.2 AML other m 2021-12-18T00:04:26.30
IV.FDMO.HHE. ML:0.4 0.000028704185 0.2 AML other m 2021-12-18T00:04:26.09
IV.MC2.EHN. ML:1.0 0.000118816125 0.54 AML other m 2021-12-18T00:04:26.81
IV.MC2.EHE. ML:0.9 0.00009624829000000001 0.16 AML other m 2021-12-18T00:04:26.70
IV.MMO1.EHN. ML:1.0 0.000081081075 0.24 AML other m 2021-12-18T00:04:27.65
IV.MMO1.EHE. ML:1.2 0.00011233834500000001 0.12 AML other m 2021-12-18T00:04:27.77
IV.CESI.HHE. ML:0.5 0.00002036232 1.42 AML other m 2021-12-18T00:04:28.72
IV.CESI.HHN. ML:0.7 0.000028210844999999997 2.2 AML other m 2021-12-18T00:04:29.28
IV.MML1.EHN. ML:0.5 0.000018694625 1.08 AML other m 2021-12-18T00:04:29.27
IV.MML1.EHE. ML:0.4 0.000016504698000000003 1.36 AML other m 2021-12-18T00:04:29.63
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