Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 22-01-2021 and time 00:19:45 (Italy) in region 5 km SE Norcia (PG)

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

  • 21-01-2021 23:19:45 (UTC)
  • 22-01-2021 00:19:45 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.76, 13.14 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 5 4957 4957
Cascia PG 11 3217 8174
Accumoli RI 12 667 8841
Arquata del Tronto AP 13 1178 10019
Castelsantangelo sul Nera MC 15 281 10300
Preci PG 16 724 11024
Cittareale RI 16 482 11506
Poggiodomo PG 17 117 11623
Montegallo AP 19 523 12146
Amatrice RI 19 2657 14803
Cerreto di Spoleto PG 19 1075 15878
Monteleone di Spoleto PG 19 599 16477
Visso MC 20 1107 17584

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km SE of Foligno (57155 inhabitants)
46 Km E of Terni (111501 inhabitants)
48 Km W of Teramo (54892 inhabitants)
50 Km NW of L'Aquila (69753 inhabitants)
72 Km SE of Perugia (166134 inhabitants)
87 Km W of Montesilvano (53738 inhabitants)
91 Km NE of Guidonia Montecelio (88673 inhabitants)
93 Km E of Viterbo (67173 inhabitants)
93 Km NE of Tivoli (56533 inhabitants)
94 Km W of Pescara (121014 inhabitants)
96 Km W of Chieti (51815 inhabitants)
100 Km SW of Ancona (100861 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.5 2021-01-21
23:19:45		 42.76 13.14 11 2021-01-21
23:28:55		 Sala Sismica INGV-Roma 86442131
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-21 23:19:45 ± 0.03
Latitude 42.76 ± 0.00
Longitude 13.14 ± 0.00
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86442131

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 259
Semi-minor axis of confidence ellipse (meter) 37
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 80
Circular confidence region, given by single value of horizontal uncertainty (meter) 260
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 75
Number of associated phases, regardless of their use for origin computation 42
Number of defining phases 30
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
Epicentral distance of station farthest from the epicenter (degree) 0.43257
Number of stations at which the event was observed 27
Number of stations from which data was used for origin computation 15
Magnitude information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 20
Type of magnitude ML
Reference to an origin 86442131
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-21 23:28:55
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.VARE.HHZ. 2021-01-21T23:21:24.67 3.0 undecidable manual Sn -0.09 0
IX.CSG3.HNZ.01 2021-01-21T23:21:09.08 3.0 undecidable manual Sg 10 0
IV.MRB1.HHZ. 2021-01-21T23:20:48.52 3.0 undecidable manual Sn 0.99 0
IV.SPS2.HHZ. 2021-01-21T23:20:42.72 3.0 negative manual Pn -3.76 0
IV.CMPR.HHZ. 2021-01-21T23:20:38.81 3.0 undecidable manual Pg 10.14 0
ST.CARE.EHZ. 2021-01-21T23:20:36.13 3.0 negative manual Pn 2.56 0
IX.MNT3.HHZ.02 2021-01-21T23:20:27.41 3.0 undecidable manual Pg 6.39 0
IV.CESX.HHZ. 2021-01-21T23:20:00.61 0.3 undecidable manual S 250 0.4326 91 0.16 69
IV.RIBO.EHZ.01 2021-01-21T23:19:58.86 3.0 undecidable manual Pn -2.65 0
IV.TERO.HHZ. 2021-01-21T23:19:58.65 0.6 undecidable manual S 112 0.3678 91 0.1 48
IV.CSP1.EHZ. 2021-01-21T23:19:57.88 0.6 undecidable manual S 8 0.3354 91 0.3 46
IV.GUMA.HHZ. 2021-01-21T23:19:57.54 0.3 undecidable manual S 25 0.3354 91 -0.04 72
IV.CESI.HHZ. 2021-01-21T23:19:56.20 0.3 undecidable manual S 325 0.2995 91 -0.3 69
IV.T0110.HHZ. 2021-01-21T23:19:55.63 3.0 negative manual Pn -2.53 0
IT.MTCL.HGE. 2021-01-21T23:19:55.10 0.6 undecidable manual S 337 0.2554 91 -0.1 48
IV.FDMO.HHZ. 2021-01-21T23:19:55.73 0.1 undecidable manual S 352 0.2797 91 -0.19 95
IV.RM33.EHZ. 2021-01-21T23:19:54.90 1.0 undecidable manual S 167 0.2563 91 -0.34 23
IV.CESX.HHZ. 2021-01-21T23:19:54.04 0.1 undecidable manual P 250 0.4326 91 0.04 95
IV.GAVE.HNN. 2021-01-21T23:19:53.26 0.6 undecidable manual S 250 0.1916 92 -0.05 50
IV.CPGN.EHZ. 2021-01-21T23:19:53.22 3.0 undecidable manual Pg -1.15 0
IV.SMA1.EHZ. 2021-01-21T23:19:53.23 0.6 undecidable manual S 132 0.1934 92 -0.15 49
IV.FEMA.HNE. 2021-01-21T23:19:53.84 0.6 undecidable manual S 342 0.2122 92 -0.09 49
IV.MMO1.EHZ. 2021-01-21T23:19:53.39 0.6 undecidable manual S 45 0.1961 92 -0.07 49
IV.TERO.HHZ. 2021-01-21T23:19:52.84 0.6 undecidable manual P 112 0.3678 91 -0.05 48
IV.T1299.EHN. 2021-01-21T23:19:52.36 0.6 undecidable manual S 140 0.1637 94 -0.13 50
IV.CSP1.EHZ. 2021-01-21T23:19:52.26 0.1 undecidable manual P 8 0.3354 91 -0.08 96
IV.LNSS.HHZ. 2021-01-21T23:19:52.49 0.6 undecidable manual S 205 0.1727 93 -0.25 49
IV.GUMA.HHZ. 2021-01-21T23:19:52.66 0.6 undecidable manual P 25 0.3354 91 0.32 46
IV.EL6.EHZ. 2021-01-21T23:19:51.33 3.0 undecidable manual Pg 3.55 0
IT.MTCL.HGE. 2021-01-21T23:19:51.01 0.1 undecidable manual P 337 0.2554 91 0.04 99
IV.CESI.HHZ. 2021-01-21T23:19:51.69 0.3 undecidable manual P 325 0.2995 91 -0.03 73
IV.FDMO.HHZ. 2021-01-21T23:19:51.24 0.1 undecidable manual P 352 0.2797 91 -0.14 96
IV.FEMA.HNE. 2021-01-21T23:19:50.66 0.1 undecidable manual P 342 0.2122 92 0.42 92
IV.NRCA.HNZ. 2021-01-21T23:19:50.00 0.6 undecidable manual S 347 0.0764 130 -0.07 51
IV.RM33.EHZ. 2021-01-21T23:19:50.96 0.6 positive manual P 167 0.2563 91 -0.03 50
IV.SMA1.EHZ. 2021-01-21T23:19:49.88 0.6 negative manual P 132 0.1934 92 -0.03 50
IV.LNSS.HHZ. 2021-01-21T23:19:49.63 0.1 positive manual P 205 0.1727 93 0.09 99
IV.MMO1.EHZ. 2021-01-21T23:19:49.92 0.1 positive manual P 45 0.1961 92 -0.04 100
IV.MTRA.EHZ. 2021-01-21T23:19:49.76 3.0 undecidable manual P -0.64 0
IV.GAVE.HNN. 2021-01-21T23:19:49.91 0.1 undecidable manual P 250 0.1916 92 0.03 100
IV.T1299.EHN. 2021-01-21T23:19:49.48 0.1 undecidable manual P 140 0.1637 94 0.08 99
IV.NRCA.HNZ. 2021-01-21T23:19:48.14 0.1 negative manual P 347 0.0764 130 0.14 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNE. ML:2.2 0.00184 0.14 AML other m 2021-01-21T23:19:50.11
IV.NRCA.HHE. ML:2.2 0.00192 0.14 AML other m 2021-01-21T23:19:50.11
IV.NRCA.HHN. ML:1.8 0.000812 0.46 AML other m 2021-01-21T23:19:50.67
IV.NRCA.HNN. ML:1.8 0.000795 0.46 AML other m 2021-01-21T23:19:50.44
IV.LNSS.HHN. ML:1.4 0.0001845 1.46 AML other m 2021-01-21T23:19:53.02
IV.LNSS.HHE. ML:1.4 0.0001665 0.7 AML other m 2021-01-21T23:19:53.74
IV.SMA1.EHE. ML:1.5 0.0001955 1.18 AML other m 2021-01-21T23:19:54.78
IV.SMA1.EHN. ML:1.3 0.000133 0.98 AML other m 2021-01-21T23:19:55.67
IV.RM33.EHE. ML:1.4 0.000114 0.9 AML other m 2021-01-21T23:19:56.10
IV.RM33.EHN. ML:1.3 0.00010075 0.24 AML other m 2021-01-21T23:19:56.36
IV.FDMO.HHE. ML:1.1 5.775E-5 0.26 AML other m 2021-01-21T23:19:56.88
IV.CESI.HHN. ML:1.5 0.000143 1.68 AML other m 2021-01-21T23:19:56.87
IV.FDMO.HHN. ML:1.2 7.175E-5 1.58 AML other m 2021-01-21T23:19:56.15
IV.CESI.HHE. ML:1.2 7.44E-5 0.36 AML other m 2021-01-21T23:19:57.38
IV.TERO.HHE. ML:1.2 4.98E-5 0.06 AML other m 2021-01-21T23:19:58.98
IV.TERO.HHN. ML:1.3 6.21E-5 0.42 AML other m 2021-01-21T23:19:59.26
IV.RM33.HNN. ML:1.8 0.0002885 0.5 AML other m 2021-01-21T23:19:59.57
IV.CSP1.EHN. ML:1.6 0.00015455 0.86 AML other m 2021-01-21T23:19:59.45
IV.CSP1.EHE. ML:1.5 0.0001225 1.5 AML other m 2021-01-21T23:19:59.05
IV.RM33.HNE. ML:1.8 0.00028 1.04 AML other m 2021-01-21T23:20:11.59
ST.CARE.EHN. ML:4.4 0.00109 0.62 AML other m 2021-01-21T23:20:59.16
ST.CARE.EHE. ML:4.4 0.0009605 0.96 AML other m 2021-01-21T23:20:59.07
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download