Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 27-01-2021 and time 02:45:11 (Italy) in region 4 km S Norcia (PG)

A magnitude ML 1.7 earthquake occured in region: 4 km S Norcia (PG), on

  • 27-01-2021 01:45:11 (UTC)
  • 27-01-2021 02:45:11 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.76, 13.08 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 4 4957 4957
Cascia PG 7 3217 8174
Poggiodomo PG 13 117 8291
Preci PG 14 724 9015
Accumoli RI 15 667 9682
Cerreto di Spoleto PG 15 1075 10757
Monteleone di Spoleto PG 16 599 11356
Castelsantangelo sul Nera MC 17 281 11637
Cittareale RI 17 482 12119
Arquata del Tronto AP 18 1178 13297
Vallo di Nera PG 18 364 13661
Visso MC 20 1107 14768
Sellano PG 20 1079 15847

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km SE of Foligno (57155 inhabitants)
42 Km NE of Terni (111501 inhabitants)
52 Km NW of L'Aquila (69753 inhabitants)
52 Km W of Teramo (54892 inhabitants)
69 Km SE of Perugia (166134 inhabitants)
88 Km E of Viterbo (67173 inhabitants)
89 Km NE of Guidonia Montecelio (88673 inhabitants)
91 Km N of Tivoli (56533 inhabitants)
91 Km W of Montesilvano (53738 inhabitants)
98 Km W of Pescara (121014 inhabitants)
100 Km W of Chieti (51815 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 1.7 2021-01-27
01:45:11		 42.76 13.08 11 2021-01-27
01:55:56		 Sala Sismica INGV-Roma 86620241
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-27 01:45:11 ± 0.05
Latitude 42.76 ± 0.00
Longitude 13.08 ± 0.00
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 86620241

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 317
Semi-minor axis of confidence ellipse (meter) 230
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 285
Circular confidence region, given by single value of horizontal uncertainty (meter) 320
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 41
Number of associated phases, regardless of their use for origin computation 38
Number of defining phases 32
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.42268
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 17
Magnitude information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 36
Type of magnitude ML
Reference to an origin 86620241
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-27 01:55:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ARVD.HHZ. 2021-01-27T01:45:38.02 3.0 undecidable manual S 0.1 0
IV.EL6.EHZ. 2021-01-27T01:45:32.22 3.0 undecidable manual S 0.05 0
IV.ASSB.HHZ. 2021-01-27T01:45:26.70 0.6 undecidable manual S 313 0.4227 50 0.16 46
IV.MOMA.HHZ. 2021-01-27T01:45:25.59 0.6 undecidable manual S 277 0.3795 50 0.33 45
IV.GUMA.HHZ. 2021-01-27T01:45:25.17 0.6 undecidable manual S 31 0.3579 50 0.56 42
IV.MF5.EHZ. 2021-01-27T01:45:25.64 0.6 undecidable manual S 50 0.3597 50 0.95 36
IV.CSP1.EHZ. 2021-01-27T01:45:24.21 0.6 undecidable manual S 15 0.3471 50 -0.09 47
IV.CESI.HHZ. 2021-01-27T01:45:22.18 0.6 undecidable manual S 332 0.2806 50 -0.16 47
IV.ATCC.EHZ. 2021-01-27T01:45:22.23 3.0 positive manual P -0.11 0
IV.MNTT.EHZ. 2021-01-27T01:45:21.97 3.0 negative manual P 0.54 0
IV.RM33.EHZ. 2021-01-27T01:45:21.78 0.3 undecidable manual S 159 0.2653 50 -0.09 72
IV.FDMO.HHZ. 2021-01-27T01:45:21.97 0.6 undecidable manual S 1 0.2806 50 -0.35 45
IV.FIAM.HHZ. 2021-01-27T01:45:21.36 3.0 undecidable manual P -0.15 0
IV.MMO1.EHZ. 2021-01-27T01:45:20.67 0.3 undecidable manual S 51 0.2293 50 -0.13 72
IV.MTRA.HNZ. 2021-01-27T01:45:20.52 0.3 undecidable manual S 90 0.2302 50 -0.31 69
IV.TERO.HHZ. 2021-01-27T01:45:20.08 3.0 undecidable manual P 0.06 0
IV.SMA1.EHZ. 2021-01-27T01:45:20.65 0.6 undecidable manual S 124 0.2239 50 0.01 49
IV.ASSB.HHZ. 2021-01-27T01:45:20.11 0.3 undecidable manual P 313 0.4227 50 -0.06 70
IV.MF5.EHZ. 2021-01-27T01:45:19.36 0.3 undecidable manual P 50 0.3597 50 0.25 68
IV.CESX.HHZ. 2021-01-27T01:45:19.56 0.3 undecidable manual P 248 0.393 50 -0.12 70
IV.MOMA.HHZ. 2021-01-27T01:45:19.63 0.3 undecidable manual P 277 0.3795 50 0.19 69
IV.MC2.EHZ. 2021-01-27T01:45:19.18 0.6 undecidable manual S 26 0.1736 119 0.04 49
IV.GUMA.HHZ. 2021-01-27T01:45:19.20 0.3 undecidable manual P 31 0.3579 50 0.14 70
IV.LNSS.HHZ. 2021-01-27T01:45:18.52 0.3 undecidable manual S 192 0.1565 122 -0.04 74
IV.CSP1.EHZ. 2021-01-27T01:45:18.67 0.1 undecidable manual P 15 0.3471 50 -0.21 92
IV.GAVE.EHZ. 2021-01-27T01:45:18.48 0.3 undecidable manual S 245 0.1529 122 0.03 75
IV.FDMO.HHZ. 2021-01-27T01:45:17.53 0.1 undecidable manual P 1 0.2806 50 -0.21 94
IV.CESI.HHZ. 2021-01-27T01:45:17.62 0.3 undecidable manual P 332 0.2806 50 -0.13 71
IV.MTRA.HNZ. 2021-01-27T01:45:17.29 0.3 undecidable manual P 90 0.2302 50 0.41 68
IV.ARRO.EHZ. 2021-01-27T01:45:17.86 0.3 undecidable manual P 233 0.2932 50 -0.09 72
IV.RM33.EHZ. 2021-01-27T01:45:17.31 0.1 undecidable manual P 159 0.2653 50 -0.17 95
IV.NRCA.HNZ. 2021-01-27T01:45:16.19 0.3 undecidable manual S 16 0.0809 140 -0.15 74
IV.MMO1.EHZ. 2021-01-27T01:45:16.64 0.1 positive manual P 51 0.2293 50 -0.22 94
IV.SMA1.EHZ. 2021-01-27T01:45:16.89 0.3 negative manual P 124 0.2239 50 0.12 72
IV.MC2.EHZ. 2021-01-27T01:45:15.89 0.1 undecidable manual P 26 0.1736 119 -0.01 99
IV.LNSS.HHZ. 2021-01-27T01:45:15.63 0.1 undecidable manual P 192 0.1565 122 0.06 99
IV.GAVE.EHZ. 2021-01-27T01:45:15.61 0.1 positive manual P 245 0.1529 122 0.1 98
IV.NRCA.HNZ. 2021-01-27T01:45:14.36 0.1 undecidable manual P 16 0.0809 140 0.07 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:2.4 0.00335 0.12 AML other m 2021-01-27T01:45:16.25
IV.NRCA.HNN. ML:2.4 0.003065 0.12 AML other m 2021-01-27T01:45:16.25
IV.NRCA.HHE. ML:2.4 0.00302 0.16 AML other m 2021-01-27T01:45:16.29
IV.NRCA.HNE. ML:2.4 0.002975 0.16 AML other m 2021-01-27T01:45:16.29
IV.GAVE.EHE. ML:2 0.0007735 1.36 AML other m 2021-01-27T01:45:19.70
IV.GAVE.HNN. ML:1.6 0.0003605 0.9 AML other m 2021-01-27T01:45:19.09
IV.GAVE.EHN. ML:2.1 0.0010525 0.36 AML other m 2021-01-27T01:45:19.10
IV.LNSS.HHN. ML:2.3 0.00156 1.36 AML other m 2021-01-27T01:45:19.86
IV.LNSS.HNN. ML:2.3 0.00163 1.38 AML other m 2021-01-27T01:45:19.87
IV.LNSS.HHE. ML:2.3 0.00165 0.82 AML other m 2021-01-27T01:45:19.81
IV.LNSS.HNE. ML:2.3 0.001505 0.8 AML other m 2021-01-27T01:45:19.81
IV.GAVE.HNE. ML:2 0.0007505 0.58 AML other m 2021-01-27T01:45:19.70
IV.FDMO.HHN. ML:1.4 0.0001185 0.42 AML other m 2021-01-27T01:45:22.00
IV.CESI.HHN. ML:1.6 0.00018 0.56 AML other m 2021-01-27T01:45:22.48
IV.SMA1.EHN. ML:1.5 0.00018655635 1.06 AML other m 2021-01-27T01:45:22.21
IV.RM33.EHN. ML:1.7 0.000256 1.1 AML other m 2021-01-27T01:45:23.01
IV.RM33.EHE. ML:1.7 0.000234 0.24 AML other m 2021-01-27T01:45:23.13
IV.SMA1.EHE. ML:1.6 0.0002305 0.2 AML other m 2021-01-27T01:45:23.72
IV.ARRO.EHN. ML:1.5 0.0001435 0.64 AML other m 2021-01-27T01:45:24.33
IV.FDMO.HHE. ML:1.4 0.0001268 0.46 AML other m 2021-01-27T01:45:24.42
IV.CESI.HHE. ML:1.3 9.045E-5 0.42 AML other m 2021-01-27T01:45:24.68
IV.CSP1.EHE. ML:1.9 0.0002735 0.28 AML other m 2021-01-27T01:45:25.26
IV.ARRO.EHE. ML:1.4 0.0001185 0.32 AML other m 2021-01-27T01:45:25.76
IV.CSP1.EHN. ML:1.9 0.000288 1.68 AML other m 2021-01-27T01:45:26.01
IV.TERO.HHN. ML:1.6 0.000132 0.64 AML other m 2021-01-27T01:45:26.47
IV.MOMA.HHE. ML:1.7 0.0001615 0.22 AML other m 2021-01-27T01:45:26.55
IV.TERO.HHE. ML:1.5 8.68E-5 1.32 AML other m 2021-01-27T01:45:26.79
IV.MOMA.HHN. ML:1.6 0.00012385 0.68 AML other m 2021-01-27T01:45:27.00
IV.ASSB.HHN. ML:1.4 8.015E-5 0.48 AML other m 2021-01-27T01:45:28.44
IV.ASSB.HHE. ML:1.4 7.355E-5 0.86 AML other m 2021-01-27T01:45:28.23
IV.FIAM.HHE. ML:1.2 3.635E-5 1.26 AML other m 2021-01-27T01:45:29.82
IV.GUMA.HHN. ML:1.7 0.00019 1.3 AML other m 2021-01-27T01:45:30.88
IV.FIAM.HHN. ML:1.2 3.65E-5 0.42 AML other m 2021-01-27T01:45:30.67
IV.GUMA.HHE. ML:1.7 0.0001700561 1.14 AML other m 2021-01-27T01:45:26.99
IV.EL6.EHE. ML:1.7 0.00010221045 2.3 AML other m 2021-01-27T01:45:33.67
IV.EL6.EHN. ML:1.8 0.0001131406 3.98 AML other m 2021-01-27T01:45:32.90
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