Earthquake with magnitude of ML 0.3 on date 17-02-2021 and time 21:19:56 (Italy) in region 4 km NW Norcia (PG)

A magnitude ML 0.3 earthquake occured in region: 4 km NW Norcia (PG), on

  • 17-02-2021 20:19:56 (UTC)
  • 17-02-2021 21:19:56 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.83, 13.07 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.

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
Preci PG 6 724 5681
Castelsantangelo sul Nera MC 10 281 5962
Visso MC 12 1107 7069
Cerreto di Spoleto PG 13 1075 8144
Cascia PG 13 3217 11361
Sellano PG 14 1079 12440
Ussita MC 14 444 12884
Poggiodomo PG 17 117 13001
Vallo di Nera PG 18 364 13365
Monte Cavallo MC 19 145 13510
Arquata del Tronto AP 19 1178 14688

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km E of Foligno (57155 inhabitants)
46 Km NE of Terni (111501 inhabitants)
55 Km W of Teramo (54892 inhabitants)
59 Km NW of L'Aquila (69753 inhabitants)
64 Km E of Perugia (166134 inhabitants)
91 Km NE of Viterbo (67173 inhabitants)
95 Km W of Montesilvano (53738 inhabitants)
95 Km SW of Ancona (100861 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
99 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 0.3 2021-02-17
20:19:56
42.83 13.07 11 2021-02-17
20:58:20
Sala Sismica INGV-Roma 87254051
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-17 20:19:56 ± 0.06
Latitude 42.83 ± 0.00
Longitude 13.07 ± 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 87254051

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 615
Semi-minor axis of confidence ellipse (meter) 294
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 109
Circular confidence region, given by single value of horizontal uncertainty (meter) 620
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 104
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
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) 0.03148
Epicentral distance of station farthest from the epicenter (degree) 0.28059
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.3

Field Value
Value 0.3
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 87254051
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-17 20:58:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-02-17T20:20:06.91 0.3 undecidable manual S 20 0.2806 50 0.09 71
IV.LNSS.HHZ. 2021-02-17T20:20:05.24 0.3 undecidable manual S 186 0.2275 50 0 73
IV.GAVE.EHZ. 2021-02-17T20:20:04.05 0.3 undecidable manual S 224 0.1889 50 -0.06 73
IV.FDMO.HHZ. 2021-02-17T20:20:04.59 0.6 undecidable manual S 3 0.2077 50 -0.08 48
IV.CESI.HHZ. 2021-02-17T20:20:04.47 0.6 undecidable manual S 325 0.214 50 -0.39 45
IV.MMO1.EHZ. 2021-02-17T20:20:04.15 0.6 undecidable manual S 69 0.1996 50 -0.29 46
IV.CSP1.EHZ. 2021-02-17T20:20:02.38 1.0 positive manual P 20 0.2806 50 0.13 23
IV.MC2.EHZ. 2021-02-17T20:20:02.11 0.3 undecidable manual S 46 0.1187 129 0.15 72
IV.GAVE.EHZ. 2021-02-17T20:20:01.05 1.0 undecidable manual P 224 0.1889 50 0.36 23
IV.LNSS.HHZ. 2021-02-17T20:20:01.40 0.1 undecidable manual P 186 0.2275 50 0.05 96
IV.FDMO.HHZ. 2021-02-17T20:20:01.07 0.6 undecidable manual P 3 0.2077 50 0.06 48
IV.CESI.HHZ. 2021-02-17T20:20:01.37 0.6 undecidable manual P 325 0.214 50 0.25 46
IV.MMO1.EHZ. 2021-02-17T20:20:00.86 0.6 undecidable manual P 69 0.1996 50 -0.02 49
IV.NRCA.HNZ. 2021-02-17T20:19:59.62 0.3 undecidable manual S 82 0.0315 162 -0.37 70
IV.MC2.EHZ. 2021-02-17T20:19:59.70 0.6 negative manual P 46 0.1187 129 0.26 47
IV.NRCA.HNZ. 2021-02-17T20:19:58.36 0.1 undecidable manual P 82 0.0315 162 0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHE. ML:0.6 2.532635E-5 0.1408 AML other m 2021-02-17T20:20:04.91
IV.GAVE.EHN. ML:0.6 2.629708E-5 0.1408 AML other m 2021-02-17T20:20:04.30
IV.FDMO.HHE. ML:-0.1 6.105403E-6 0.1024 AML other m 2021-02-17T20:20:05.09
IV.FDMO.HHN. ML:-0.1 6.5271205E-6 0.2048 AML other m 2021-02-17T20:20:05.20
IV.CESI.HHE. ML:0.2 1.11284925E-5 0.1792 AML other m 2021-02-17T20:20:05.16
IV.CESI.HHN. ML:0.5 2.159733E-5 0.0896 AML other m 2021-02-17T20:20:05.18
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