Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 01-04-2021 and time 21:14:14 (Italy) in region 7 km E Norcia (PG)

A magnitude ML 1.1 earthquake occured in region: 7 km E Norcia (PG), on

  • 01-04-2021 19:14:14 (UTC)
  • 01-04-2021 21:14:14 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7780, 13.1810 at 9 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 7 4957 4957
Arquata del Tronto AP 10 1178 6135
Accumoli RI 11 667 6802
Castelsantangelo sul Nera MC 13 281 7083
Montegallo AP 14 523 7606
Cascia PG 15 3217 10823
Preci PG 16 724 11547
Cittareale RI 18 482 12029
Montemonaco AP 18 604 12633
Amatrice RI 19 2657 15290
Acquasanta Terme AP 19 2916 18206
Visso MC 19 1107 19313
Ussita MC 19 444 19757

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km E of Foligno (57155 inhabitants)
45 Km W of Teramo (54892 inhabitants)
50 Km E of Terni (111501 inhabitants)
51 Km NW of L'Aquila (69753 inhabitants)
74 Km SE of Perugia (166134 inhabitants)
85 Km W of Montesilvano (53738 inhabitants)
91 Km W of Pescara (121014 inhabitants)
94 Km NW of Chieti (51815 inhabitants)
94 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km NE of Tivoli (56533 inhabitants)
97 Km E of Viterbo (67173 inhabitants)
97 Km S of Ancona (100861 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.1 2021-04-01
19:14:14		 42.778 13.1812 9 2021-04-01
19:21:47		 Sala Sismica INGV-Roma 88687201
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-01 19:14:14 ± 0.07
Latitude 42.7780 ± 0.0027
Longitude 13.1812 ± 0.0074
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 88687201

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 528
Semi-minor axis of confidence ellipse (meter) 223
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 252
Circular confidence region, given by single value of horizontal uncertainty (meter) 530.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 139
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.31386
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.4
Num. used stations 6
Type of magnitude ML
Reference to an origin 88687201
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-01 19:21:47
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VVLD.HHZ. 2021-04-01T19:14:31.21 3.0 undecidable manual P 0 0
IV.CSP1.EHZ. 2021-04-01T19:14:26.48 0.1 undecidable manual S 3 34.8429 50 -0.05 95
IV.FDMO.HHZ. 2021-04-01T19:14:25.10 0.3 undecidable manual S 345 29.6481 107 0.06 72
IV.LNSS.HHE. 2021-04-01T19:14:22.88 0.3 undecidable manual S 211 22.5552 112 0.17 71
IV.SMA1.EHZ. 2021-04-01T19:14:22.00 0.3 undecidable manual S 142 20.6682 113 -0.09 72
IV.CSP1.EHZ. 2021-04-01T19:14:21.25 1.0 positive manual P 3 34.8429 50 -0.1 23
IV.T1299.HNE. 2021-04-01T19:14:21.22 0.3 undecidable manual S 153 17.9709 117 -0.03 74
IV.FDMO.HHZ. 2021-04-01T19:14:20.41 0.1 undecidable manual P 345 29.6481 107 -0.09 95
IV.MC2.EHZ. 2021-04-01T19:14:20.64 0.3 undecidable manual S 2 14.7741 121 0.34 69
IV.LNSS.HHE. 2021-04-01T19:14:19.25 0.3 undecidable manual P 211 22.5552 112 0.1 72
IV.T1299.HNE. 2021-04-01T19:14:18.43 0.1 undecidable manual P 153 17.9709 117 0.12 96
IV.MC2.EHZ. 2021-04-01T19:14:18.01 0.6 positive manual P 2 14.7741 121 0.25 47
IV.NRCA.HHZ. 2021-04-01T19:14:18.22 0.1 undecidable manual S 319 8.1807 137 -0.29 94
IV.SMA1.EHZ. 2021-04-01T19:14:18.61 0.3 undecidable manual P 142 20.6682 113 -0.19 71
IV.NRCA.HHZ. 2021-04-01T19:14:16.71 0.1 negative manual P 319 8.1807 137 -0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.3 0.000296 0.12 AML other m 2021-04-01T19:14:18.28
IV.NRCA.HHE. ML:1.3 0.0002991046 0.1024 AML other m 2021-04-01T19:14:18.69
IV.FDMO.HHE. ML:0.3 0.000011174999999999999 0.8 AML other m 2021-04-01T19:14:27.62
IV.FDMO.HHN. ML:0.3 0.00000933 1.34 AML other m 2021-04-01T19:14:28.70
IV.NRCA.HNE. ML:1.3 0.00028216195 0.1024 AML other m 2021-04-01T19:14:18.95
IV.NRCA.HNN. ML:1.2 0.0002498215 0.1024 AML other m 2021-04-01T19:14:18.33
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download