Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 27-01-2021 and time 02:11:41 (Italy) in region 5 km E Vallo di Nera (PG)

A magnitude ML 1.0 earthquake occured in region: 5 km E Vallo di Nera (PG), on

  • 27-01-2021 01:11:41 (UTC)
  • 27-01-2021 02:11:41 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.77, 12.92 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
Vallo di Nera PG 5 364 364
Cerreto di Spoleto PG 6 1075 1439
Poggiodomo PG 7 117 1556
Sant'Anatolia di Narco PG 8 564 2120
Cascia PG 9 3217 5337
Scheggino PG 10 461 5798
Campello sul Clitunno PG 13 2442 8240
Sellano PG 13 1079 9319
Monteleone di Spoleto PG 13 599 9918
Norcia PG 14 4957 14875
Spoleto PG 15 38218 53093
Preci PG 16 724 53817
Trevi PG 19 8469 62286
Ferentillo TR 20 1913 64199

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km SE of Foligno (57155 inhabitants)
32 Km NE of Terni (111501 inhabitants)
57 Km SE of Perugia (166134 inhabitants)
61 Km NW of L'Aquila (69753 inhabitants)
65 Km W of Teramo (54892 inhabitants)
77 Km NE of Viterbo (67173 inhabitants)
87 Km N of Guidonia Montecelio (88673 inhabitants)
90 Km N of Tivoli (56533 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 2021-01-27
01:11:41		 42.77 12.92 11 2021-01-27
01:22:37		 Sala Sismica INGV-Roma 86619381
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-27 01:11:41 ± 0.05
Latitude 42.77 ± 0.00
Longitude 12.92 ± 0.01
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 86619381

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 469
Semi-minor axis of confidence ellipse (meter) 219
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 102
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) 163
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.12
Epicentral distance of station closest to the epicenter (degree) 0.08004
Epicentral distance of station farthest from the epicenter (degree) 0.29228
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.2
Num. used stations 5
Type of magnitude ML
Reference to an origin 86619381
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-27 01:22:37
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2021-01-27T01:11:52.43 0.6 undecidable manual S 24 0.2923 50 0.01 49
IV.CESI.HHZ. 2021-01-27T01:11:50.79 0.6 undecidable manual S 357 0.2347 50 0.08 49
IV.LNSS.HHZ. 2021-01-27T01:11:49.19 0.3 undecidable manual S 152 0.1889 50 -0.14 73
IV.NRCA.HHZ. 2021-01-27T01:11:48.31 0.3 undecidable manual S 66 0.1547 122 0 75
IV.FDMO.HHZ. 2021-01-27T01:11:47.60 0.1 undecidable manual P 24 0.2923 50 -0.1 96
IV.LNSS.HHZ. 2021-01-27T01:11:46.11 0.1 undecidable manual P 152 0.1889 50 0.19 96
IV.GAVE.EHZ. 2021-01-27T01:11:46.03 0.1 undecidable manual S 194 0.08 141 -0.1 100
IV.CESI.HHZ. 2021-01-27T01:11:46.66 0.1 undecidable manual P 357 0.2347 50 -0.05 98
IV.NRCA.HHZ. 2021-01-27T01:11:45.35 0.3 undecidable manual P 66 0.1547 122 0.03 75
IV.GAVE.EHZ. 2021-01-27T01:11:44.17 0.1 undecidable manual P 194 0.08 141 0.1 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHN. ML:1.3 0.00025 0.14 AML other m 2021-01-27T01:11:46.61
IV.GAVE.EHE. ML:1.2 0.0001895 0.9 AML other m 2021-01-27T01:11:46.27
IV.NRCA.HHN. ML:0.9 6.635E-5 0.12 AML other m 2021-01-27T01:11:48.64
IV.NRCA.HHE. ML:0.8 5.575E-5 1.04 AML other m 2021-01-27T01:11:48.12
IV.GAVE.HNN. ML:1 0.000136811685 0.6096 AML other m 2021-01-27T01:11:46.61
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