Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 18-12-2021 and time 23:43:43 (UTC) in region 5 km S Preci (PG)

A magnitude ML 1.5 earthquake occured in region: 5 km S Preci (PG), on

  • 18-12-2021 23:43:43 (UTC)
  • 19-12-2021 00:43:43 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8370, 13.0310 at 10 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
Preci PG 5 724 724
Norcia PG 7 4957 5681
Cerreto di Spoleto PG 9 1075 6756
Sellano PG 10 1079 7835
Visso MC 12 1107 8942
Castelsantangelo sul Nera MC 12 281 9223
Cascia PG 13 3217 12440
Ussita MC 15 444 12884
Vallo di Nera PG 16 364 13248
Poggiodomo PG 16 117 13365
Monte Cavallo MC 18 145 13510
Sant'Anatolia di Narco PG 20 564 14074

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km E of Foligno (57155 inhabitants)
44 Km NE of Terni (111501 inhabitants)
59 Km W of Teramo (54892 inhabitants)
60 Km SE of Perugia (166134 inhabitants)
62 Km NW of L'Aquila (69753 inhabitants)
89 Km NE of Viterbo (67173 inhabitants)
95 Km SW of Ancona (100861 inhabitants)
96 Km N of Guidonia Montecelio (88673 inhabitants)
98 Km W of Montesilvano (53738 inhabitants)
99 Km N of Tivoli (56533 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 1.5 2021-12-18
23:43:43		 42.8368 13.0308 10 2022-03-30
13:04:27		 Bollettino Sismico Italiano INGV 99363101
Reviewed
Rev100 		ML 1.4 2021-12-18
23:43:44		 42.8378 13.0257 9 2021-12-18
23:48:30		 Sala Sismica INGV-Roma 98704731
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-18 23:43:43 ± 0.04
Latitude 42.8368 ± 0.0018
Longitude 13.0308 ± 0.0025
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 99363101

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 233
Semi-minor axis of confidence ellipse (meter) 174
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 73
Circular confidence region, given by single value of horizontal uncertainty (meter) 230.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 42
Number of associated phases, regardless of their use for origin computation 48
Number of defining phases 48
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) 0.06115
Epicentral distance of station farthest from the epicenter (degree) 0.67719
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 25
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 98704731
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-18 23:48:30

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 99363101
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-05 15:31:43
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ATCC.EHZ. 2021-12-18T23:44:00.17 0.3 undecidable manual S 321 50.0166 50 0.19 69
IV.TERO.HHZ. 2021-12-18T23:44:00.41 0.3 undecidable manual S 117 52.4031 50 -0.22 68
IV.SNTG.HHZ. 2021-12-18T23:43:59.35 0.3 undecidable manual S 351 46.9197 50 0.18 69
IV.CESX.HHZ. 2021-12-18T23:43:58.82 0.6 undecidable manual S 235 44.2224 50 0.39 44
IV.MF5.EHZ. 2021-12-18T23:43:57.23 0.3 undecidable manual S 64 38.628 50 0.27 69
IV.RM33.EHZ. 2021-12-18T23:43:57.35 0.3 undecidable manual S 158 39.3273 50 0.21 70
IV.ASSB.HHZ. 2021-12-18T23:43:56.47 0.3 undecidable manual S 307 37.8288 50 -0.28 69
IV.MGAB.HHZ. 2021-12-18T23:43:56.86 0.6 undecidable manual P 277 75.1692 50 -0.23 43
IV.ARRO.EHZ. 2021-12-18T23:43:56.62 0.6 undecidable manual S 217 35.8419 50 0.41 45
IV.PF6.EHZ. 2021-12-18T23:43:56.05 0.6 undecidable manual S 22 35.9418 50 -0.18 47
IV.GUMA.HHZ. 2021-12-18T23:43:56.51 0.3 undecidable manual S 45 35.1426 50 0.48 66
IV.SMA1.EHZ. 2021-12-18T23:43:55.40 0.3 undecidable manual S 133 33.744 50 -0.25 70
IV.MTRA.EHZ. 2021-12-18T23:43:54.78 0.3 undecidable manual S 107 31.0467 50 -0.15 72
IV.CSP1.EHZ. 2021-12-18T23:43:54.89 0.3 undecidable manual S 26 31.6461 50 -0.19 71
IV.MML1.EHZ. 2021-12-18T23:43:54.80 0.3 undecidable manual S 351 31.0467 50 -0.13 72
IV.MNTT.EHZ. 2021-12-18T23:43:53.99 0.3 undecidable manual P 61 52.2033 50 0.44 65
IV.ATCC.EHZ. 2021-12-18T23:43:53.29 0.3 undecidable manual P 321 50.0166 50 0.08 70
IV.LNSS.HHZ. 2021-12-18T23:43:53.42 0.3 undecidable manual S 178 25.9518 50 -0.15 72
IV.TERO.HHZ. 2021-12-18T23:43:53.29 0.3 undecidable manual P 117 52.4031 50 -0.29 67
IV.FDMO.HHZ. 2021-12-18T23:43:52.21 0.3 undecidable manual S 12 22.6551 114 -0.33 70
IV.SNTG.HHZ. 2021-12-18T23:43:52.66 0.3 undecidable manual P 351 46.9197 50 -0.08 71
IV.MMO1.EHZ. 2021-12-18T23:43:52.96 0.3 undecidable manual S 74 25.0527 112 -0.36 69
IV.CESX.HHZ. 2021-12-18T23:43:52.09 0.1 undecidable manual P 235 44.2224 50 -0.22 92
IV.RM33.EHZ. 2021-12-18T23:43:51.71 0.3 undecidable manual P 158 39.3273 50 0.14 71
IV.GUMA.HHZ. 2021-12-18T23:43:51.15 0.1 positive manual P 45 35.1426 50 0.22 94
IV.ASSB.HHZ. 2021-12-18T23:43:51.20 0.1 undecidable manual P 307 37.8288 50 -0.14 95
IV.GAVE.EHZ. 2021-12-18T23:43:51.55 0.3 undecidable manual S 215 19.5693 117 -0.03 75
IV.MF5.EHZ. 2021-12-18T23:43:51.82 0.1 undecidable manual P 64 38.628 50 0.36 90
IV.CESI.HHZ. 2021-12-18T23:43:51.95 0.3 undecidable manual S 331 21.2676 115 -0.16 73
IV.SMA1.EHZ. 2021-12-18T23:43:50.77 0.3 undecidable manual P 133 33.744 50 0.07 73
IV.MML1.EHZ. 2021-12-18T23:43:50.29 0.3 undecidable manual P 351 31.0467 50 0 74
IV.MC2.EHZ. 2021-12-18T23:43:50.51 0.3 undecidable manual S 57 15.2736 123 0.21 73
IV.MTRA.EHZ. 2021-12-18T23:43:50.09 0.3 undecidable manual P 107 31.0467 50 -0.2 71
IV.ARRO.EHZ. 2021-12-18T23:43:50.82 0.1 undecidable manual P 217 35.8419 50 -0.21 94
IV.CSP1.EHZ. 2021-12-18T23:43:50.19 0.3 undecidable manual P 26 31.6461 50 -0.19 71
IT.MTCL.HGZ. 2021-12-18T23:43:50.73 0.6 undecidable manual S 352 17.5713 120 -0.26 48
IV.PF6.EHZ. 2021-12-18T23:43:50.82 0.1 undecidable manual P 22 35.9418 50 -0.22 94
IV.FEMA.HNZ. 2021-12-18T23:43:49.95 0.3 undecidable manual S 6 13.9749 126 0.03 76
IV.LNSS.HHZ. 2021-12-18T23:43:49.42 0.3 undecidable manual P 178 25.9518 50 -0.09 73
IV.MMO1.EHZ. 2021-12-18T23:43:49.22 0.1 positive manual P 74 25.0527 112 -0.14 97
IV.GAVE.EHZ. 2021-12-18T23:43:48.57 0.1 positive manual P 215 19.5693 117 0.22 96
IT.MTCL.HGZ. 2021-12-18T23:43:48.20 0.1 undecidable manual P 352 17.5713 120 0.19 97
IV.CESI.HHZ. 2021-12-18T23:43:48.75 0.1 positive manual P 331 21.2676 115 0.08 99
IV.NRCA.HHZ. 2021-12-18T23:43:48.02 0.3 undecidable manual S 93 6.7932 146 -0.14 75
IV.FDMO.HHZ. 2021-12-18T23:43:48.88 0.3 positive manual P 12 22.6551 114 -0.03 75
IV.FEMA.HNZ. 2021-12-18T23:43:47.65 0.1 undecidable manual P 6 13.9749 126 0.25 97
IV.MC2.EHZ. 2021-12-18T23:43:47.82 0.3 undecidable manual P 57 15.2736 123 0.2 73
IV.NRCA.HHZ. 2021-12-18T23:43:46.52 0.1 undecidable manual P 93 6.7932 146 0.14 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:2.0 0.00158 0.16 AML other m 2021-12-18T23:43:48.14
IV.NRCA.HNN. ML:2.0 0.00143 0.16 AML other m 2021-12-18T23:43:48.14
IV.NRCA.HNE. ML:2.0 0.001415 0.14 AML other m 2021-12-18T23:43:48.29
IV.NRCA.HHE. ML:2.0 0.001555 0.14 AML other m 2021-12-18T23:43:48.29
IV.GAVE.EHN. ML:1.8 0.000419 0.78 AML other m 2021-12-18T23:43:51.88
IV.GAVE.EHE. ML:1.7 0.00039749999999999996 0.12 AML other m 2021-12-18T23:43:51.94
IV.CESI.HHN. ML:1.4 0.0001785 0.54 AML other m 2021-12-18T23:43:52.41
IV.FDMO.HHE. ML:1.5 0.0002275 0.18 AML other m 2021-12-18T23:43:52.73
IV.FDMO.HHN. ML:1.2 0.00009875 0.96 AML other m 2021-12-18T23:43:52.42
IV.MMO1.EHE. ML:1.8 0.00035299999999999996 0.22 AML other m 2021-12-18T23:43:53.27
IV.MMO1.EHN. ML:1.6 0.0002395 0.24 AML other m 2021-12-18T23:43:53.80
IV.LNSS.HHN. ML:1.2 0.00009070000000000001 0.16 AML other m 2021-12-18T23:43:53.90
IV.LNSS.HHE. ML:1.3 0.00012009999999999998 1.14 AML other m 2021-12-18T23:43:54.07
IV.CESI.HHE. ML:1.1 0.0000845 1.32 AML other m 2021-12-18T23:43:54.14
IV.MTRA.EHE. ML:1.4 0.00011485000000000001 0.84 AML other m 2021-12-18T23:43:55.01
IV.MTRA.EHN. ML:1.4 0.0001225 0.26 AML other m 2021-12-18T23:43:55.46
IV.ASSB.HHN. ML:1.2 0.00005715000000000001 0.42 AML other m 2021-12-18T23:43:57.18
IV.ASSB.HHE. ML:1.2 0.00005515 0.46 AML other m 2021-12-18T23:43:58.69
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