Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.7 on date 21-02-2021 and time 04:57:51 (UTC) in region 5 km NE Norcia (PG)

A magnitude ML 0.7 earthquake occured in region: 5 km NE Norcia (PG), on

  • 21-02-2021 04:57:51 (UTC)
  • 21-02-2021 05:57:51 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.83, 13.14 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 5 4957 4957
Castelsantangelo sul Nera MC 8 281 5238
Preci PG 10 724 5962
Visso MC 12 1107 7069
Ussita MC 13 444 7513
Arquata del Tronto AP 14 1178 8691
Cascia PG 16 3217 11908
Montegallo AP 16 523 12431
Accumoli RI 17 667 13098
Montemonaco AP 18 604 13702
Cerreto di Spoleto PG 18 1075 14777
Sellano PG 18 1079 15856

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km E of Foligno (57155 inhabitants)
50 Km NE of Terni (111501 inhabitants)
50 Km W of Teramo (54892 inhabitants)
57 Km NW of L'Aquila (69753 inhabitants)
68 Km E of Perugia (166134 inhabitants)
90 Km W of Montesilvano (53738 inhabitants)
93 Km SW of Ancona (100861 inhabitants)
96 Km E of Viterbo (67173 inhabitants)
97 Km W of Pescara (121014 inhabitants)
98 Km NE of Guidonia Montecelio (88673 inhabitants)
100 Km NW of Chieti (51815 inhabitants)
100 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 0.7 2021-02-21
04:57:51		 42.83 13.14 10 2021-02-21
05:02:26		 Sala Sismica INGV-Roma 87350191
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-21 04:57:51 ± 0.04
Latitude 42.83 ± 0.00
Longitude 13.14 ± 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 87350191

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 340
Semi-minor axis of confidence ellipse (meter) 92
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 287
Circular confidence region, given by single value of horizontal uncertainty (meter) 340
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 64
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.3984
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 11
Magnitude information

ML:0.7

Field Value
Value 0.7
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 87350191
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-21 05:02:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.LAV9.HNZ. 2021-02-21T04:58:29.13 3.0 undecidable manual S -0.72 0
IV.TERO.HHZ. 2021-02-21T04:58:05.24 0.6 undecidable manual S 120 0.3984 50 -0.37 45
IV.RM33.EHZ. 2021-02-21T04:58:03.45 0.6 undecidable manual S 170 0.322 50 0.13 48
IV.CESI.HHZ. 2021-02-21T04:58:01.15 0.6 undecidable manual S 317 0.2464 50 0.05 50
IV.CSP1.EHZ. 2021-02-21T04:58:01.76 0.6 undecidable manual S 11 0.2707 50 -0.06 49
IV.GAVE.EHZ. 2021-02-21T04:58:00.21 0.6 undecidable manual S 233 0.2221 111 0 50
IV.LNSS.HHZ. 2021-02-21T04:58:00.65 0.6 undecidable manual S 198 0.2329 110 0.03 50
IV.MNTT.EHZ. 2021-02-21T04:58:00.57 3.0 negative manual P 0.61 0
IV.TERO.HHZ. 2021-02-21T04:57:59.31 0.1 undecidable manual P 120 0.3984 50 -0.14 94
IV.FDMO.HHZ. 2021-02-21T04:57:59.73 0.6 undecidable manual S 350 0.214 112 -0.19 48
IV.RM33.EHZ. 2021-02-21T04:57:58.25 1.0 undecidable manual P 170 0.322 50 0.12 24
IV.CSP1.EHZ. 2021-02-21T04:57:57.11 1.0 negative manual P 11 0.2707 50 -0.15 24
IV.MF5.EHZ. 2021-02-21T04:57:57.94 0.6 negative manual P 55 0.2869 50 0.4 46
IV.MMO1.EHZ. 2021-02-21T04:57:57.92 0.6 undecidable manual S 62 0.1583 119 -0.06 50
IV.FDMO.HHZ. 2021-02-21T04:57:56.09 0.1 undecidable manual P 350 0.214 112 -0.08 99
IV.MC2.EHZ. 2021-02-21T04:57:56.22 0.6 undecidable manual S 24 0.0944 133 0.25 49
IV.GAVE.EHZ. 2021-02-21T04:57:56.46 0.3 positive manual P 233 0.2221 111 0.13 73
IV.LNSS.HHZ. 2021-02-21T04:57:56.59 0.1 undecidable manual P 198 0.2329 110 0.02 100
IV.CESI.HHZ. 2021-02-21T04:57:56.81 0.1 undecidable manual P 317 0.2464 50 -0.04 99
IV.MMO1.EHZ. 2021-02-21T04:57:55.13 0.1 positive manual P 62 0.1583 119 0.09 100
IV.NRCA.HHZ. 2021-02-21T04:57:54.02 0.6 undecidable manual S 297 0.018 168 -0.44 48
IV.MC2.EHZ. 2021-02-21T04:57:54.22 0.6 positive manual P 24 0.0944 133 0.34 48
IV.NRCA.HHZ. 2021-02-21T04:57:53.03 0.6 undecidable manual P 297 0.018 168 0.02 52
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:0 0.00058 0.06 AML other m 2021-02-21T04:57:54.12
IV.NRCA.HHE. ML:0 0.0011885 0.16 AML other m 2021-02-21T04:57:54.12
IV.LNSS.HHN. ML:0.8 3.985E-5 0.24 AML other m 2021-02-21T04:58:01.20
IV.LNSS.HHE. ML:0.8 3.69E-5 0.42 AML other m 2021-02-21T04:58:01.78
IV.TERO.HHN. ML:0.7 1.352E-5 1.52 AML other m 2021-02-21T04:58:06.07
IV.TERO.HHE. ML:0.5 9.45E-6 0.52 AML other m 2021-02-21T04:58:07.59
IV.LAV9.HHE. ML:2.6 0.0002535 0.96 AML other m 2021-02-21T04:58:39.57
IV.LAV9.HHN. ML:2.5 0.0001845 0.06 AML other m 2021-02-21T04:58:39.94
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