Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 21-12-2020 and time 06:00:10 (UTC) in region 5 km SE Preci (PG)

A magnitude ML 1.0 earthquake occured in region: 5 km SE Preci (PG), on

  • 21-12-2020 06:00:10 (UTC)
  • 21-12-2020 07:00:10 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8580, 13.0870 at 11 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
Preci PG 5 724 724
Castelsantangelo sul Nera MC 7 281 1005
Norcia PG 7 4957 5962
Visso MC 8 1107 7069
Ussita MC 11 444 7513
Sellano PG 13 1079 8592
Cerreto di Spoleto PG 14 1075 9667
Cascia PG 17 3217 12884
Monte Cavallo MC 17 145 13029
Bolognola MC 19 142 13171
Arquata del Tronto AP 20 1178 14349
Fiordimonte MC 20 202 14551

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km E of Foligno (57155 inhabitants)
49 Km NE of Terni (111501 inhabitants)
55 Km W of Teramo (54892 inhabitants)
62 Km NW of L'Aquila (69753 inhabitants)
63 Km E of Perugia (166134 inhabitants)
92 Km SW of Ancona (100861 inhabitants)
94 Km NE of Viterbo (67173 inhabitants)
95 Km W of Montesilvano (53738 inhabitants)
100 Km NE of Guidonia Montecelio (88673 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 2020-12-21
06:00:10		 42.858 13.0867 11 2020-12-21
06:11:35		 Sala Sismica INGV-Roma 85594511
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-21 06:00:10 ± 0.05
Latitude 42.8580 ± 0.0027
Longitude 13.0867 ± 0.0061
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 85594511

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 479
Semi-minor axis of confidence ellipse (meter) 294
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 93
Circular confidence region, given by single value of horizontal uncertainty (meter) 480.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 98
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
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) 0.03148
Epicentral distance of station farthest from the epicenter (degree) 0.24911
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 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 85594511
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-21 06:11:35
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2020-12-21T06:00:20.79 0.3 undecidable manual S 20 27.6501 50 -0.04 72
IV.CESI.HHZ. 2020-12-21T06:00:19.38 0.1 undecidable manual S 318 21.9669 50 0.07 98
IV.GAVE.EHZ. 2020-12-21T06:00:19.80 0.3 undecidable manual S 220 24.1536 50 -0.09 71
IV.FDMO.HHZ. 2020-12-21T06:00:18.53 0.3 undecidable manual S 0 19.7691 50 -0.2 70
IT.MTCL.HGE. 2020-12-21T06:00:17.67 0.3 undecidable manual S 335 16.6722 50 -0.22 71
IV.GAVE.EHZ. 2020-12-21T06:00:16.24 0.6 negative manual P 220 24.1536 50 0.12 48
IV.CSP1.EHZ. 2020-12-21T06:00:16.64 0.6 negative manual P 20 27.6501 50 -0.02 48
IV.FEMA.HNE. 2020-12-21T06:00:16.68 0.3 undecidable manual S 345 11.877 133 0.07 74
IV.CESI.HHZ. 2020-12-21T06:00:15.85 0.1 undecidable manual P 318 21.9669 50 0.06 98
IV.FDMO.HHZ. 2020-12-21T06:00:15.41 0.6 undecidable manual P 0 19.7691 50 -0.04 48
IV.FEMA.HNE. 2020-12-21T06:00:14.52 0.1 undecidable manual P 345 11.877 133 0.29 94
IV.NRCA.HHZ. 2020-12-21T06:00:14.81 0.1 undecidable manual S 140 3.4965 162 -0.18 98
IV.MC2.EHN. 2020-12-21T06:00:14.12 0.1 undecidable manual P 55 10.1787 137 0.13 97
IT.MTCL.HGE. 2020-12-21T06:00:14.91 0.1 undecidable manual P 335 16.6722 50 -0.05 97
IV.NRCA.HHZ. 2020-12-21T06:00:13.33 0.1 undecidable manual P 140 3.4965 162 0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.5 0.000496 0.08 AML other m 2020-12-21T06:00:14.92
IV.NRCA.HHE. ML:1.3 0.0003155 0.14 AML other m 2020-12-21T06:00:14.94
IV.CESI.HHN. ML:0.8 0.00004045 0.74 AML other m 2020-12-21T06:00:19.54
IV.CESI.HHE. ML:0.7 0.00003435 0.42 AML other m 2020-12-21T06:00:19.73
IV.GAVE.EHN. ML:0.9 0.0000522 0.16 AML other m 2020-12-21T06:00:20.16
IV.GAVE.EHE. ML:1.0 0.0000531 1.04 AML other m 2020-12-21T06:00:20.66
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