Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.6 on date 18-12-2021 and time 08:17:15 (Italy) in region 3 km W Preci (PG)

A magnitude ML 0.6 earthquake occured in region: 3 km W Preci (PG), on

  • 18-12-2021 07:17:15 (UTC)
  • 18-12-2021 08:17:15 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8810, 13.0090 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 3 724 724
Sellano PG 7 1079 1803
Visso MC 9 1107 2910
Cerreto di Spoleto PG 10 1075 3985
Castelsantangelo sul Nera MC 12 281 4266
Norcia PG 12 4957 9223
Monte Cavallo MC 13 145 9368
Ussita MC 13 444 9812
Vallo di Nera PG 17 364 10176
Cascia PG 18 3217 13393
Pieve Torina MC 19 1458 14851
Fiordimonte MC 19 202 15053
Poggiodomo PG 20 117 15170
Campello sul Clitunno PG 20 2442 17612

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km E of Foligno (57155 inhabitants)
46 Km NE of Terni (111501 inhabitants)
56 Km E of Perugia (166134 inhabitants)
62 Km W of Teramo (54892 inhabitants)
67 Km NW of L'Aquila (69753 inhabitants)
90 Km NE of Viterbo (67173 inhabitants)
92 Km SW of Ancona (100861 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 0.6 2021-12-18
07:17:15		 42.881 13.0087 10 2022-03-30
13:04:23		 Bollettino Sismico Italiano INGV 98809741
Reviewed
Rev100 		ML 0.6 2021-12-18
07:17:15		 42.8798 13.0033 11 2021-12-18
07:29:37		 Sala Sismica INGV-Roma 98651091
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-18 07:17:15 ± 0.05
Latitude 42.8810 ± 0.0027
Longitude 13.0087 ± 0.0049
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 98809741

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 413
Semi-minor axis of confidence ellipse (meter) 109
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 101
Circular confidence region, given by single value of horizontal uncertainty (meter) 410.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 54
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.33005
Number of stations at which the event was observed 27
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:0.6

Field Value
Value 0.6
Uncertainty 0.2
Num. used stations 2
Type of magnitude ML
Reference to an origin 98809741
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-22 08:57:29

ML:0.6

Field Value
Value 0.6
Uncertainty 0.4
Num. used stations 4
Type of magnitude ML
Reference to an origin 98651091
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-18 07:29:37
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GRIS.EHZ. 2021-12-18T07:19:11.93 3.0 undecidable manual Sg 4.82 0
CR.STON.BHZ. 2021-12-18T07:19:08.32 3.0 undecidable manual Sg 11.56 0
IV.SCHR.EHZ. 2021-12-18T07:19:06.05 3.0 undecidable manual Sg 5.59 0
IV.CDRU.HHZ. 2021-12-18T07:18:52.48 3.0 undecidable manual Sg 6.3 0
MN.TRI.HHZ. 2021-12-18T07:18:37.53 3.0 undecidable manual Sn -3.22 0
AC.PUK.HHZ. 2021-12-18T07:18:35.70 3.0 undecidable manual Pn -1.96 0
IT.ORP.HGZ. 2021-12-18T07:18:26.50 3.0 undecidable manual Sn -4.18 0
GU.RORO.HHZ. 2021-12-18T07:18:20.23 3.0 undecidable manual Pn 1.84 0
IX.SCL3.EHZ.02 2021-12-18T07:18:13.41 3.0 negative manual Pg 6.43 0
IV.SGAL.EHZ. 2021-12-18T07:18:11.33 3.0 undecidable manual Pn 0.28 0
IV.RIBO.EHZ.01 2021-12-18T07:18:04.78 3.0 undecidable manual S -2.99 0
IV.ZCCA.HNZ. 2021-12-18T07:17:58.37 3.0 undecidable manual Pg 4.02 0
OT.OT17.EHZ. 2021-12-18T07:17:58.32 3.0 positive manual Pg 1.96 0
IV.CELB.HHZ. 2021-12-18T07:17:52.10 3.0 undecidable manual Pn -2.92 0
IT.GLNS.HNZ. 2021-12-18T07:17:48.53 3.0 undecidable manual Pn -2.27 0
IV.SFI.EHZ. 2021-12-18T07:17:39.70 3.0 positive manual P -4.23 0
IV.VIVA.HHZ. 2021-12-18T07:17:39.40 3.0 negative manual P -4.09 0
IV.LNSS.HHZ. 2021-12-18T07:17:26.83 0.3 undecidable manual S 175 30.9468 50 0.07 74
IV.CSP1.EHZ. 2021-12-18T07:17:26.05 0.3 undecidable manual S 34 28.2495 50 0 75
IV.GAVE.EHN. 2021-12-18T07:17:24.25 0.3 undecidable manual S 204 22.9548 114 -0.34 71
IV.CESI.HHE. 2021-12-18T07:17:22.61 0.6 undecidable manual S 328 16.1727 123 0.1 50
IV.MC2.EHZ. 2021-12-18T07:17:22.15 0.3 undecidable manual S 77 15.0738 124 -0.04 77
IT.GNU.HGE. 2021-12-18T07:17:22.87 1.0 undecidable manual P 257 36.6411 50 -0.17 24
IV.LNSS.HHZ. 2021-12-18T07:17:22.17 0.6 undecidable manual P 175 30.9468 50 0.01 50
IV.FDMO.HHZ. 2021-12-18T07:17:22.84 0.3 undecidable manual S 20 18.3705 119 -0.35 71
IV.ASSB.HHN. 2021-12-18T07:17:22.75 0.6 undecidable manual P 302 33.6441 50 0.19 48
IV.MML1.HNE. 2021-12-18T07:17:21.44 0.1 undecidable manual P 353 25.9518 50 0.05 100
IV.CSP1.EHZ. 2021-12-18T07:17:21.53 0.3 undecidable manual P 34 28.2495 50 -0.22 72
IV.NRCA.HHZ. 2021-12-18T07:17:21.00 0.3 undecidable manual S 121 10.0788 136 0.13 76
IV.GAVE.EHN. 2021-12-18T07:17:20.82 0.1 undecidable manual P 204 22.9548 114 -0.08 100
IV.FDMO.HHZ. 2021-12-18T07:17:20.03 0.3 undecidable manual P 20 18.3705 119 -0.06 76
IV.CESI.HHE. 2021-12-18T07:17:19.97 0.1 undecidable manual P 328 16.1727 123 0.26 97
IV.NRCA.HHZ. 2021-12-18T07:17:19.04 0.1 undecidable manual P 121 10.0788 136 0.28 98
IV.MC2.EHZ. 2021-12-18T07:17:19.47 0.6 undecidable manual P 77 15.0738 124 -0.05 51
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHN. ML:0.7 0.000041314815 0.7392 AML other m 2021-12-18T07:17:23.41
IV.FDMO.HHE. ML:0.4 0.000019927777 1.1392 AML other m 2021-12-18T07:17:23.65
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