Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 03-03-2021 and time 11:10:18 (UTC) in region 4 km S Norcia (PG)

A magnitude ML 1.0 earthquake occured in region: 4 km S Norcia (PG), on

  • 03-03-2021 11:10:18 (UTC)
  • 03-03-2021 12:10:18 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.75, 13.09 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
Norcia PG 5 4957 4957
Cascia PG 7 3217 8174
Poggiodomo PG 13 117 8291
Preci PG 15 724 9015
Accumoli RI 15 667 9682
Monteleone di Spoleto PG 16 599 10281
Cerreto di Spoleto PG 16 1075 11356
Cittareale RI 16 482 11838
Castelsantangelo sul Nera MC 17 281 12119
Arquata del Tronto AP 17 1178 13297
Vallo di Nera PG 18 364 13661
Visso MC 20 1107 14768
Sellano PG 20 1079 15847

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km SE of Foligno (57155 inhabitants)
42 Km NE of Terni (111501 inhabitants)
51 Km NW of L'Aquila (69753 inhabitants)
52 Km W of Teramo (54892 inhabitants)
69 Km SE of Perugia (166134 inhabitants)
89 Km E of Viterbo (67173 inhabitants)
89 Km NE of Guidonia Montecelio (88673 inhabitants)
91 Km N of Tivoli (56533 inhabitants)
91 Km W of Montesilvano (53738 inhabitants)
98 Km W of Pescara (121014 inhabitants)
99 Km W of Chieti (51815 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 2021-03-03
11:10:18		 42.75 13.09 11 2021-03-03
11:16:16		 Sala Sismica INGV-Roma 87658071
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-03 11:10:18 ± 0.09
Latitude 42.75 ± 0.00
Longitude 13.09 ± 0.00
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 87658071

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 437
Semi-minor axis of confidence ellipse (meter) 263
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 117
Circular confidence region, given by single value of horizontal uncertainty (meter) 440
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 19
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.38311
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 87658071
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-03 11:16:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.RMP.HHZ. 2021-03-03T11:10:36.75 3.0 positive manual P -0.18 0
IV.MOMA.HHN. 2021-03-03T11:10:33.15 0.6 undecidable manual S 278 0.3831 50 0.49 43
IV.CSP1.EHZ. 2021-03-03T11:10:31.63 0.6 undecidable manual S 14 0.3489 50 -0.02 48
IV.FDMO.HHZ. 2021-03-03T11:10:29.42 0.6 undecidable manual S 360 0.2833 50 -0.27 46
IV.CESI.HHZ. 2021-03-03T11:10:29.38 0.3 undecidable manual S 332 0.2851 50 -0.37 68
IV.MTRA.HNZ. 2021-03-03T11:10:27.90 0.6 undecidable manual S 89 0.2266 50 -0.13 48
IV.MOMA.HHN. 2021-03-03T11:10:26.82 0.1 undecidable manual P 278 0.3831 50 0.01 96
IV.MC2.EHZ. 2021-03-03T11:10:26.76 0.3 undecidable manual S 25 0.1745 50 0.28 71
IV.CSP1.EHZ. 2021-03-03T11:10:26.22 1.0 negative manual P 14 0.3489 50 -0.01 24
IV.LNSS.HHZ. 2021-03-03T11:10:25.83 0.6 undecidable manual S 193 0.1547 50 -0.06 50
IV.FDMO.HHZ. 2021-03-03T11:10:25.11 1.0 negative manual P 360 0.2833 50 0.01 25
IV.GAVE.EHZ. 2021-03-03T11:10:25.61 0.3 undecidable manual S 247 0.1547 50 -0.28 71
IV.CESI.HHZ. 2021-03-03T11:10:25.60 0.6 undecidable manual P 332 0.2851 50 0.47 45
IV.MTRA.HNZ. 2021-03-03T11:10:24.10 0.1 undecidable manual P 89 0.2266 50 -0.04 99
IV.NRCA.HHZ. 2021-03-03T11:10:23.57 0.6 undecidable manual S 14 0.0827 140 -0.23 49
IV.MC2.EHZ. 2021-03-03T11:10:23.35 0.6 positive manual P 25 0.1745 50 0.1 49
IV.LNSS.HHZ. 2021-03-03T11:10:22.94 0.1 undecidable manual P 193 0.1547 50 0.04 100
IV.GAVE.EHZ. 2021-03-03T11:10:22.96 0.1 negative manual P 247 0.1547 50 0.05 100
IV.NRCA.HHZ. 2021-03-03T11:10:21.80 0.3 undecidable manual P 14 0.0827 140 0.1 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.5 0.0003935 0.16 AML other m 2021-03-03T11:10:23.79
IV.NRCA.HHE. ML:1.6 0.000555 0.16 AML other m 2021-03-03T11:10:23.92
IV.LNSS.HHN. ML:1.3 0.0001795 1.82 AML other m 2021-03-03T11:10:25.07
IV.LNSS.HHE. ML:1.3 0.0001725 0.4 AML other m 2021-03-03T11:10:26.01
IV.GAVE.EHE. ML:1 7.486041E-5 0.1408 AML other m 2021-03-03T11:10:26.20
IV.GAVE.EHN. ML:1 7.810784E-5 0.1216 AML other m 2021-03-03T11:10:26.04
IV.FDMO.HHE. ML:0.8 2.975305E-5 0.48 AML other m 2021-03-03T11:10:30.80
IV.FDMO.HHN. ML:0.6 2.0505905E-5 0.224 AML other m 2021-03-03T11:10:30.56
IV.CESI.HHE. ML:0.4 1.1243098E-5 0.6592 AML other m 2021-03-03T11:10:29.77
IV.CESI.HHN. ML:0.8 2.845173E-5 1.44 AML other m 2021-03-03T11:10:29.92
IV.CSP1.EHE. ML:1 3.363851E-5 0.5184 AML other m 2021-03-03T11:10:31.91
IV.CSP1.EHN. ML:1.2 5.003247E-5 3.04 AML other m 2021-03-03T11:10:32.59
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