Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 16-01-2021 and time 03:37:27 (UTC) in region 7 km NE Sellano (PG)

A magnitude ML 1.0 earthquake occured in region: 7 km NE Sellano (PG), on

  • 16-01-2021 03:37:27 (UTC)
  • 16-01-2021 04:37:27 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.93, 12.99 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
Sellano PG 7 1079 1079
Preci PG 7 724 1803
Monte Cavallo MC 7 145 1948
Visso MC 8 1107 3055
Ussita MC 12 444 3499
Cerreto di Spoleto PG 13 1075 4574
Castelsantangelo sul Nera MC 14 281 4855
Pieve Torina MC 14 1458 6313
Fiordimonte MC 15 202 6515
Serravalle di Chienti MC 16 1070 7585
Pievebovigliana MC 17 866 8451
Norcia PG 17 4957 13408
Muccia MC 18 915 14323
Fiastra MC 18 559 14882
Acquacanina MC 19 121 15003

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km E of Foligno (57155 inhabitants)
49 Km NE of Terni (111501 inhabitants)
53 Km E of Perugia (166134 inhabitants)
66 Km W of Teramo (54892 inhabitants)
72 Km NW of L'Aquila (69753 inhabitants)
88 Km SW of Ancona (100861 inhabitants)
92 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 1.0 2021-01-16
03:37:27		 42.93 12.99 11 2021-01-16
03:42:20		 Sala Sismica INGV-Roma 86287511
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-16 03:37:27 ± 0.08
Latitude 42.93 ± 0.00
Longitude 12.99 ± 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 86287511

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 560
Semi-minor axis of confidence ellipse (meter) 362
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 29
Circular confidence region, given by single value of horizontal uncertainty (meter) 560
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 159
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.09893
Epicentral distance of station farthest from the epicenter (degree) 0.2671
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.2
Num. used stations 2
Type of magnitude ML
Reference to an origin 86287511
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-16 03:42:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MMO1.EHZ. 2021-01-16T03:37:37.81 0.3 undecidable manual S 97 0.2482 50 -0.01 98
IV.ASSB.HHZ. 2021-01-16T03:37:37.94 0.6 undecidable manual S 295 0.2671 50 -0.43 60
IV.CSP1.EHZ. 2021-01-16T03:37:37.22 0.6 undecidable manual S 44 0.2266 50 0.05 65
IV.FDMO.HHZ. 2021-01-16T03:37:34.11 0.3 undecidable manual S 33 0.1295 127 -0.08 99
IV.NRCA.HHZ. 2021-01-16T03:37:34.14 0.6 undecidable manual S 136 0.1313 127 -0.12 65
IV.ASSB.HHZ. 2021-01-16T03:37:34.43 0.6 undecidable manual P 295 0.2671 50 0.47 59
IV.CESI.HHZ. 2021-01-16T03:37:33.29 0.6 undecidable manual S 321 0.0989 135 0 67
IV.CSP1.EHZ. 2021-01-16T03:37:33.29 0.6 negative manual P 44 0.2266 50 0.02 66
IV.MMO1.EHZ. 2021-01-16T03:37:33.61 1.0 negative manual P 97 0.2482 50 -0.03 33
IV.NRCA.HHZ. 2021-01-16T03:37:31.63 0.6 positive manual P 136 0.1313 127 0.04 66
IV.CESI.HHZ. 2021-01-16T03:37:31.11 0.6 negative manual P 321 0.0989 135 0.08 66
IV.FDMO.HHZ. 2021-01-16T03:37:31.58 0.3 negative manual P 33 0.1295 127 0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHE. ML:0.9 8.39E-5 0.18 AML other m 2021-01-16T03:37:33.42
IV.CESI.HHN. ML:1.2 0.0001675 0.22 AML other m 2021-01-16T03:37:33.53
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