Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 25-12-2020 and time 19:24:48 (Italy) in region 1 km W Norcia (PG)

A magnitude ML 1.2 earthquake occured in region: 1 km W Norcia (PG), on

  • 25-12-2020 18:24:48 (UTC)
  • 25-12-2020 19:24:48 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7940, 13.0870 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
Norcia PG 1 4957 4957
Preci PG 10 724 5681
Cascia PG 10 3217 8898
Castelsantangelo sul Nera MC 13 281 9179
Cerreto di Spoleto PG 14 1075 10254
Visso MC 15 1107 11361
Poggiodomo PG 15 117 11478
Sellano PG 17 1079 12557
Accumoli RI 17 667 13224
Ussita MC 17 444 13668
Arquata del Tronto AP 17 1178 14846
Vallo di Nera PG 19 364 15210
Monteleone di Spoleto PG 19 599 15809

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km SE of Foligno (57155 inhabitants)
44 Km NE of Terni (111501 inhabitants)
53 Km W of Teramo (54892 inhabitants)
55 Km NW of L'Aquila (69753 inhabitants)
67 Km SE of Perugia (166134 inhabitants)
91 Km E of Viterbo (67173 inhabitants)
92 Km W of Montesilvano (53738 inhabitants)
93 Km NE of Guidonia Montecelio (88673 inhabitants)
95 Km N of Tivoli (56533 inhabitants)
98 Km SW of Ancona (100861 inhabitants)
99 Km W of Pescara (121014 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 1.2 2020-12-25
18:24:48		 42.7945 13.0868 10 2021-02-26
14:56:16		 Bollettino Sismico Italiano INGV 86632761
Reviewed
Rev100 		ML 1.2 2020-12-25
18:24:48		 42.7932 13.0727 10 2020-12-25
18:30:50		 Sala Sismica INGV-Roma 85711861
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-25 18:24:48 ± 0.05
Latitude 42.7945 ± 0.0027
Longitude 13.0868 ± 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 86632761

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 392
Semi-minor axis of confidence ellipse (meter) 197
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 109
Circular confidence region, given by single value of horizontal uncertainty (meter) 390.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 94
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
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) 0.04407
Epicentral distance of station farthest from the epicenter (degree) 0.30937
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 86632761
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-27 14:24:42

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 85711861
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-25 18:30:50
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2020-12-25T18:25:00.52 0.3 undecidable manual S 16 34.3434 50 0.1 71
IV.FDMO.HHZ. 2020-12-25T18:24:58.29 0.6 undecidable manual S 0 26.8509 50 -0.13 48
IV.CESI.HHZ. 2020-12-25T18:24:58.57 0.6 undecidable manual S 328 27.6501 50 -0.06 48
IV.SMA1.EHN. 2020-12-25T18:24:58.29 0.6 undecidable manual S 132 27.2505 50 -0.23 47
IV.T1299.HNN. 2020-12-25T18:24:57.73 0.6 undecidable manual S 138 23.8539 113 0.2 47
IV.GAVE.EHN. 2020-12-25T18:24:56.06 0.6 undecidable manual S 234 19.3695 117 -0.05 49
IV.LNSS.HHZ. 2020-12-25T18:24:56.65 0.3 undecidable manual S 190 21.5673 115 -0.16 72
IV.MMO1.EHZ. 2020-12-25T18:24:56.90 0.3 undecidable manual S 59 22.755 114 -0.27 70
IV.MC2.EHZ. 2020-12-25T18:24:55.16 0.3 undecidable manual S 33 15.3735 123 0.23 72
IV.CSP1.EHZ. 2020-12-25T18:24:55.39 0.1 undecidable manual P 16 34.3434 50 -0.02 97
IV.SMA1.EHN. 2020-12-25T18:24:54.52 0.3 undecidable manual P 132 27.2505 50 0.22 71
IV.FDMO.HHZ. 2020-12-25T18:24:54.18 0.1 undecidable manual P 0 26.8509 50 -0.07 97
IV.CESI.HHZ. 2020-12-25T18:24:54.31 0.3 undecidable manual P 328 27.6501 50 -0.06 73
IV.MMO1.EHZ. 2020-12-25T18:24:53.42 0.1 undecidable manual P 59 22.755 114 -0.1 97
IV.T1299.HNN. 2020-12-25T18:24:53.88 0.3 undecidable manual P 138 23.8539 113 0.15 72
IV.GAVE.EHN. 2020-12-25T18:24:53.20 0.3 undecidable manual P 234 19.3695 117 0.28 70
IV.LNSS.HHZ. 2020-12-25T18:24:53.17 0.1 undecidable manual P 190 21.5673 115 -0.15 96
IV.NRCA.HHZ. 2020-12-25T18:24:52.15 0.1 undecidable manual S 27 4.8951 154 -0.26 97
IV.MC2.EHZ. 2020-12-25T18:24:52.52 0.1 undecidable manual P 33 15.3735 123 0.29 94
IV.NRCA.HHZ. 2020-12-25T18:24:50.88 0.1 undecidable manual P 27 4.8951 154 0.1 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNE. ML:1.4 0.00038412655 0.1024 AML other m 2020-12-25T18:24:52.27
IV.NRCA.HHN. ML:1.5 0.0005017106 0.1024 AML other m 2020-12-25T18:24:52.20
IV.NRCA.HNN. ML:1.4 0.0004167943 0.1152 AML other m 2020-12-25T18:24:52.26
IV.NRCA.HHE. ML:1.4 0.0003785379 0.0768 AML other m 2020-12-25T18:24:52.36
IV.LNSS.HHE. ML:0.6 0.00002369213 0.1408 AML other m 2020-12-25T18:24:56.98
IV.CSP1.EHE. ML:1.2 0.000069008215 1.472 AML other m 2020-12-25T18:24:57.89
IV.FDMO.HHE. ML:0.3 0.000011403805 0.1152 AML other m 2020-12-25T18:24:58.85
IV.LNSS.HNN. ML:1.3 0.00013734045 0.8096 AML other m 2020-12-25T18:25:04.77
IV.LNSS.HNE. ML:1.3 0.0001249267 0.8192 AML other m 2020-12-25T18:25:05.46
IV.LNSS.HHN. ML:0.6 0.000029836705 1.1936 AML other m 2020-12-25T18:25:06.18
IV.FDMO.HHN. ML:0.6 0.00001990167 0.4768 AML other m 2020-12-25T18:25:09.26
IV.CSP1.EHN. ML:1.1 0.000051811505000000004 0.6048 AML other m 2020-12-25T18:25:12.04
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