Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 10-12-2020 and time 21:50:22 (Italy) in region 3 km E Norcia (PG)

A magnitude ML 1.1 earthquake occured in region: 3 km E Norcia (PG), on

  • 10-12-2020 20:50:22 (UTC)
  • 10-12-2020 21:50:22 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7840, 13.1310 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
Norcia PG 3 4957 4957
Cascia PG 12 3217 8174
Castelsantangelo sul Nera MC 13 281 8455
Preci PG 13 724 9179
Arquata del Tronto AP 14 1178 10357
Accumoli RI 14 667 11024
Visso MC 17 1107 12131
Montegallo AP 18 523 12654
Poggiodomo PG 18 117 12771
Ussita MC 18 444 13215
Cerreto di Spoleto PG 18 1075 14290
Cittareale RI 19 482 14772

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km E of Foligno (57155 inhabitants)
47 Km NE of Terni (111501 inhabitants)
49 Km W of Teramo (54892 inhabitants)
53 Km NW of L'Aquila (69753 inhabitants)
70 Km SE of Perugia (166134 inhabitants)
89 Km W of Montesilvano (53738 inhabitants)
93 Km NE of Guidonia Montecelio (88673 inhabitants)
93 Km E of Viterbo (67173 inhabitants)
95 Km N of Tivoli (56533 inhabitants)
96 Km W of Pescara (121014 inhabitants)
98 Km NW of Chieti (51815 inhabitants)
98 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
Reviewed
Rev100 		ML 1.1 2020-12-10
20:50:22		 42.7842 13.1312 11 2020-12-10
20:55:55		 Sala Sismica INGV-Roma 85345111
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-10 20:50:22 ± 0.07
Latitude 42.7842 ± 0.0036
Longitude 13.1312 ± 0.0098
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 85345111

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 825
Semi-minor axis of confidence ellipse (meter) 260
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 289
Circular confidence region, given by single value of horizontal uncertainty (meter) 830.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 149
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 12
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.31206
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 85345111
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-10 20:55:55
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CESX.HHZ. 2020-12-10T20:50:40.28 3.0 undecidable manual S 0.46 0
IV.CSP1.EHZ. 2020-12-10T20:50:34.02 0.3 undecidable manual S 10 34.6431 50 0.2 70
IV.FDMO.HHZ. 2020-12-10T20:50:31.96 0.3 undecidable manual S 353 28.2495 50 -0.14 72
IV.LNSS.HHZ. 2020-12-10T20:50:30.37 0.3 undecidable manual S 200 21.4674 50 0.07 74
IV.MMO1.EHZ. 2020-12-10T20:50:29.87 0.3 undecidable manual S 51 20.3685 50 -0.15 73
IV.MC2.EHZ. 2020-12-10T20:50:28.70 0.3 undecidable manual S 18 14.874 127 0.18 73
IV.CSP1.EHZ. 2020-12-10T20:50:28.86 0.6 positive manual P 10 34.6431 50 -0.01 49
IV.FDMO.HHZ. 2020-12-10T20:50:27.83 1.0 negative manual P 353 28.2495 50 -0.05 25
IV.NRCA.HHZ. 2020-12-10T20:50:26.18 0.3 undecidable manual S 346 5.6943 153 -0.22 74
IV.LNSS.HHZ. 2020-12-10T20:50:26.82 0.1 positive manual P 200 21.4674 50 -0.01 100
IV.MC2.EHZ. 2020-12-10T20:50:26.22 1.0 undecidable manual P 18 14.874 127 0.41 23
IV.MMO1.EHZ. 2020-12-10T20:50:26.48 1.0 positive manual P 51 20.3685 50 -0.2 24
IV.NRCA.HHZ. 2020-12-10T20:50:24.59 1.0 undecidable manual P 346 5.6943 153 0.01 26
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.3 0.00029774775 0.0768 AML other m 2020-12-10T20:50:26.27
IV.NRCA.HHN. ML:1.5 0.00046814735000000004 0.0768 AML other m 2020-12-10T20:50:26.23
IV.NRCA.HNE. ML:1.3 0.00028990004999999996 0.0768 AML other m 2020-12-10T20:50:26.23
IV.NRCA.HNN. ML:1.4 0.00039458349999999995 0.0768 AML other m 2020-12-10T20:50:26.27
IV.LNSS.HHE. ML:0.6 0.000023227138500000002 0.1024 AML other m 2020-12-10T20:50:31.25
IV.LNSS.HHN. ML:0.8 0.000038248815 0.1664 AML other m 2020-12-10T20:50:31.10
IV.LNSS.HNE. ML:1.1 0.00008994408499999999 0.6784 AML other m 2020-12-10T20:50:28.10
IV.LNSS.HNN. ML:1.3 0.000135004015 0.8448 AML other m 2020-12-10T20:50:38.09
IV.FDMO.HHE. ML:0.5 0.0000129057445 0.1408 AML other m 2020-12-10T20:50:32.61
IV.FDMO.HHN. ML:0.3 0.000011209439 0.384 AML other m 2020-12-10T20:50:32.23
IV.CSP1.EHE. ML:1.2 0.000059286465 0.96 AML other m 2020-12-10T20:50:45.73
IV.CSP1.EHN. ML:1.1 0.000051500485 1.1904 AML other m 2020-12-10T20:50:43.81
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