Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 27-01-2021 and time 07:55:03 (UTC) in region 5 km W Visso (MC)

A magnitude ML 1.8 earthquake occured in region: 5 km W Visso (MC), on

  • 27-01-2021 07:55:03 (UTC)
  • 27-01-2021 08:55:03 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.94, 13.03 at 6 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
Visso MC 5 1107 1107
Monte Cavallo MC 6 145 1252
Preci PG 7 724 1976
Ussita MC 9 444 2420
Sellano PG 10 1079 3499
Castelsantangelo sul Nera MC 11 281 3780
Pieve Torina MC 12 1458 5238
Fiordimonte MC 12 202 5440
Pievebovigliana MC 14 866 6306
Fiastra MC 15 559 6865
Acquacanina MC 15 121 6986
Muccia MC 16 915 7901
Serravalle di Chienti MC 16 1070 8971
Cerreto di Spoleto PG 16 1075 10046
Bolognola MC 17 142 10188
Norcia PG 17 4957 15145

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km E of Foligno (57155 inhabitants)
53 Km NE of Terni (111501 inhabitants)
55 Km E of Perugia (166134 inhabitants)
63 Km NW of Teramo (54892 inhabitants)
72 Km NW of L'Aquila (69753 inhabitants)
85 Km SW of Ancona (100861 inhabitants)
95 Km NE of Viterbo (67173 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 1.8 2021-01-27
07:55:03		 42.94 13.03 6 2021-01-27
08:04:16		 Sala Sismica INGV-Roma 86626431
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-27 07:55:03 ± 0.08
Latitude 42.94 ± 0.00
Longitude 13.03 ± 0.01
Depth (km) 6 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86626431

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 471
Semi-minor axis of confidence ellipse (meter) 238
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 246
Circular confidence region, given by single value of horizontal uncertainty (meter) 470
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 43
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.02518
Epicentral distance of station farthest from the epicenter (degree) 0.527
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 23
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 28
Type of magnitude ML
Reference to an origin 86626431
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-27 08:04:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-01-27T07:55:14.16 1.0 undecidable manual P 127 0.527 50 -0.14 22
IV.MURB.HHZ. 2021-01-27T07:55:13.50 1.0 undecidable manual P 311 0.4901 50 -0.18 22
IV.CAMP.HHZ. 2021-01-27T07:55:13.30 1.0 undecidable manual P 146 0.491 50 -0.39 21
IV.RM33.EHZ. 2021-01-27T07:55:12.93 1.0 undecidable manual P 163 0.4524 50 -0.1 23
IV.ARRO.EHZ. 2021-01-27T07:55:12.14 1.0 undecidable manual P 208 0.411 50 -0.18 23
IV.EL6.EHZ. 2021-01-27T07:55:11.83 1.0 undecidable manual P 7 0.3912 50 -0.16 23
IV.MOMA.HHZ. 2021-01-27T07:55:11.31 1.0 undecidable manual P 248 0.3651 99 -0.14 23
IV.ATCC.EHZ. 2021-01-27T07:55:11.54 0.6 positive manual P 311 0.3759 98 -0.16 46
IV.MDAR.HNZ. 2021-01-27T07:55:10.63 0.6 undecidable manual P 18 0.2644 102 1.38 29
IV.LNSS.HHZ. 2021-01-27T07:55:10.50 0.3 positive manual P 179 0.3381 99 -0.36 66
IV.MF5.EHZ. 2021-01-27T07:55:10.12 1.0 negative manual P 81 0.3166 100 -0.27 23
IV.ASSB.HHZ. 2021-01-27T07:55:09.66 0.1 positive manual P 291 0.2914 101 -0.17 93
IV.GAVE.EHZ. 2021-01-27T07:55:09.49 0.3 positive manual P 202 0.268 102 0.15 70
IV.GUMA.HHZ. 2021-01-27T07:55:09.06 0.1 positive manual P 61 0.2527 102 0.06 96
IV.CESI.HHZ. 2021-01-27T07:55:08.33 0.6 undecidable manual S 305 0.1124 116 0.25 47
IV.MMO1.EHZ. 2021-01-27T07:55:08.39 0.3 undecidable manual P 101 0.2203 104 0.1 72
IV.NRCA.HHZ. 2021-01-27T07:55:08.78 0.6 undecidable manual S 151 0.1232 114 0.33 46
IV.CSP1.EHZ. 2021-01-27T07:55:07.65 0.1 positive manual P 40 0.197 106 -0.14 95
IV.MML1.EHZ. 2021-01-27T07:55:07.61 1.0 undecidable manual P 346 0.1781 107 0.22 23
IV.FDMO.HHZ. 2021-01-27T07:55:07.72 0.6 undecidable manual S 23 0.1034 118 -0.05 49
IV.NRCA.HHZ. 2021-01-27T07:55:06.39 0.1 negative manual P 151 0.1232 114 0.14 96
IV.CESI.HHZ. 2021-01-27T07:55:06.39 0.1 positive manual P 305 0.1124 116 0.35 92
IV.MC2.EHZ. 2021-01-27T07:55:06.31 0.6 positive manual P 104 0.1187 115 0.15 48
IT.MTCL.HGZ. 2021-01-27T07:55:06.17 0.3 undecidable manual S 336 0.0576 134 -0.16 73
IT.MTCL.HGZ. 2021-01-27T07:55:05.05 0.1 positive manual P 336 0.0576 134 0.03 100
IV.FDMO.HHZ. 2021-01-27T07:55:05.79 0.1 positive manual P 23 0.1034 118 -0.07 98
IV.FEMA.HNZ. 2021-01-27T07:55:04.85 1.0 undecidable manual S 32 0.0252 156 -0.73 21
IV.FEMA.HNZ. 2021-01-27T07:55:04.36 0.1 negative manual P 32 0.0252 156 -0.23 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHN. ML:1.7 0.000791 0.16 AML other m 2021-01-27T07:55:07.89
IV.FDMO.HHE. ML:1.8 0.0009885 1.8 AML other m 2021-01-27T07:55:07.90
IV.NRCA.HNE. ML:2 0.00106 0.46 AML other m 2021-01-27T07:55:09.13
IV.NRCA.HHN. ML:2.2 0.001735 0.14 AML other m 2021-01-27T07:55:09.37
IV.NRCA.HHE. ML:2 0.001135 0.48 AML other m 2021-01-27T07:55:09.13
IV.NRCA.HNN. ML:2.2 0.001735 0.14 AML other m 2021-01-27T07:55:09.37
IV.CESI.HHN. ML:2.1 0.001505 0.54 AML other m 2021-01-27T07:55:09.19
IV.CESI.HHE. ML:1.6 0.0005005 1.12 AML other m 2021-01-27T07:55:09.22
IV.CSP1.EHE. ML:1.9 0.000633 0.58 AML other m 2021-01-27T07:55:13.41
IV.GUMA.HHN. ML:2.5 0.00193 0.2 AML other m 2021-01-27T07:55:13.97
IV.CSP1.EHN. ML:2 0.00073 1.26 AML other m 2021-01-27T07:55:14.07
IV.GAVE.EHE. ML:2 0.0004645 0.44 AML other m 2021-01-27T07:55:14.67
IV.GUMA.HHE. ML:2.2 0.0009065 0.24 AML other m 2021-01-27T07:55:15.15
IV.ASSB.HHN. ML:1.7 0.000211 0.34 AML other m 2021-01-27T07:55:15.24
IV.GAVE.EHN. ML:1.9 0.0003695 0.54 AML other m 2021-01-27T07:55:15.80
IV.LNSS.HHE. ML:1.7 0.0001745 0.2 AML other m 2021-01-27T07:55:17.17
IV.LNSS.HHN. ML:1.6 0.0001385 1.34 AML other m 2021-01-27T07:55:17.91
IV.ASSB.HHE. ML:1.7 0.0002125 0.74 AML other m 2021-01-27T07:55:17.43
IV.EL6.EHE. ML:1.8 0.000212 0.8 AML other m 2021-01-27T07:55:17.97
IV.MOMA.HHN. ML:1.4 8.745E-5 0.5 AML other m 2021-01-27T07:55:18.38
IV.MOMA.HHE. ML:1.5 0.0001165 0.34 AML other m 2021-01-27T07:55:19.42
IV.ATCC.EHN. ML:1.7 0.0001855 0.42 AML other m 2021-01-27T07:55:19.76
IV.EL6.EHN. ML:1.9 0.0002345 0.64 AML other m 2021-01-27T07:55:20.64
IV.ATCC.EHE. ML:1.7 0.0001705 0.68 AML other m 2021-01-27T07:55:20.99
IV.ARRO.EHN. ML:1.4 8.425E-5 0.16 AML other m 2021-01-27T07:55:21.30
IV.ARRO.EHE. ML:1.4 7.3E-5 1.08 AML other m 2021-01-27T07:55:21.95
IV.TERO.HHE. ML:1.4 5.285E-5 0.5 AML other m 2021-01-27T07:55:23.35
IV.TERO.HHN. ML:1.6 7.925E-5 0.42 AML other m 2021-01-27T07:55:23.79
IV.MURB.HHE. ML:2 0.0002255 0.32 AML other m 2021-01-27T07:55:24.45
IV.MURB.HHN. ML:1.9 0.000207 1 AML other m 2021-01-27T07:55:26.97
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