Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 25-01-2021 and time 02:05:25 (Italy) in region 3 km NE Norcia (PG)

A magnitude ML 1.0 earthquake occured in region: 3 km NE Norcia (PG), on

  • 25-01-2021 01:05:25 (UTC)
  • 25-01-2021 02:05:25 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.82, 13.12 at 10 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 3 4957 4957
Castelsantangelo sul Nera MC 9 281 5238
Preci PG 10 724 5962
Visso MC 13 1107 7069
Cascia PG 14 3217 10286
Ussita MC 15 444 10730
Arquata del Tronto AP 15 1178 11908
Cerreto di Spoleto PG 16 1075 12983
Accumoli RI 17 667 13650
Sellano PG 18 1079 14729
Montegallo AP 18 523 15252
Poggiodomo PG 19 117 15369
Montemonaco AP 20 604 15973

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km E of Foligno (57155 inhabitants)
48 Km NE of Terni (111501 inhabitants)
51 Km W of Teramo (54892 inhabitants)
56 Km NW of L'Aquila (69753 inhabitants)
68 Km E of Perugia (166134 inhabitants)
91 Km W of Montesilvano (53738 inhabitants)
94 Km E of Viterbo (67173 inhabitants)
95 Km SW of Ancona (100861 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
98 Km W of Pescara (121014 inhabitants)
98 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 2021-01-25
01:05:25		 42.82 13.12 10 2021-01-25
02:34:17		 Sala Sismica INGV-Roma 86549311
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-25 01:05:25 ± 0.04
Latitude 42.82 ± 0.00
Longitude 13.12 ± 0.00
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86549311

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 320
Semi-minor axis of confidence ellipse (meter) 34
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 107
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) 88
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 14
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
Epicentral distance of station farthest from the epicenter (degree) 0.24551
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0
Num. used stations 2
Type of magnitude ML
Reference to an origin 86549311
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-25 02:34:17
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CPGN.EHZ. 2021-01-25T01:06:03.67 3.0 undecidable manual S -0.14 0
IV.MMUR.HNZ. 2021-01-25T01:05:48.48 3.0 undecidable manual S 0.1 0
IV.SMA1.EHZ. 2021-01-25T01:05:35.07 0.6 undecidable manual S 139 0.2446 50 -0.24 47
IV.CESI.HNN. 2021-01-25T01:05:35.28 0.6 undecidable manual S 321 0.2455 50 -0.05 49
IV.LNSS.HHZ. 2021-01-25T01:05:34.33 0.6 undecidable manual S 195 0.2203 112 -0.15 48
IV.FDMO.HHZ. 2021-01-25T01:05:34.40 0.6 undecidable manual S 354 0.2221 112 -0.15 48
IV.GAVE.EHZ. 2021-01-25T01:05:33.99 0.6 undecidable manual S 233 0.205 113 0.04 50
IV.MMO1.EHZ. 2021-01-25T01:05:32.86 0.6 undecidable manual S 61 0.1745 117 -0.03 50
IV.CESI.HNN. 2021-01-25T01:05:31.14 0.1 undecidable manual P 321 0.2455 50 0.03 99
IV.SMA1.EHZ. 2021-01-25T01:05:31.36 0.3 undecidable manual P 139 0.2446 50 0.26 71
IV.GAVE.EHZ. 2021-01-25T01:05:30.26 0.1 undecidable manual P 233 0.205 113 -0.05 99
IV.LNSS.HHZ. 2021-01-25T01:05:30.60 0.3 undecidable manual P 195 0.2203 112 -0.01 75
IV.FDMO.HHZ. 2021-01-25T01:05:30.65 0.3 undecidable manual P 354 0.2221 112 -0.01 75
IV.MMO1.EHZ. 2021-01-25T01:05:29.66 0.1 undecidable manual P 61 0.1745 117 -0.04 100
IV.NRCA.HHZ. 2021-01-25T01:05:28.72 0.6 undecidable manual S 352 0.018 168 -0.11 51
IV.NRCA.HHZ. 2021-01-25T01:05:27.58 0.1 undecidable manual P 352 0.018 168 0.22 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1 0.000192 0.42 AML other m 2021-01-25T01:05:28.55
IV.NRCA.HHN. ML:1 0.000187 1.54 AML other m 2021-01-25T01:05:30.10
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