Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 05-05-2021 and time 01:23:14 (Italy) in region 4 km SE Norcia (PG)

A magnitude ML 0.8 earthquake occured in region: 4 km SE Norcia (PG), on

  • 04-05-2021 23:23:14 (UTC)
  • 05-05-2021 01:23:14 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7640, 13.1110 at 11 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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 4 4957 4957
Cascia PG 9 3217 8174
Accumoli RI 14 667 8841
Preci PG 14 724 9565
Castelsantangelo sul Nera MC 15 281 9846
Arquata del Tronto AP 15 1178 11024
Poggiodomo PG 15 117 11141
Cittareale RI 17 482 11623
Cerreto di Spoleto PG 17 1075 12698
Monteleone di Spoleto PG 18 599 13297
Visso MC 19 1107 14404

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km SE of Foligno (57155 inhabitants)
44 Km NE of Terni (111501 inhabitants)
50 Km W of Teramo (54892 inhabitants)
52 Km NW of L'Aquila (69753 inhabitants)
70 Km SE of Perugia (166134 inhabitants)
89 Km W of Montesilvano (53738 inhabitants)
91 Km NE of Guidonia Montecelio (88673 inhabitants)
91 Km E of Viterbo (67173 inhabitants)
93 Km N of Tivoli (56533 inhabitants)
96 Km W of Pescara (121014 inhabitants)
98 Km W of Chieti (51815 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
Bulletin
Rev1000 		ML 0.8 2021-05-04
23:23:14		 42.7638 13.1113 11 2021-12-29
11:11:59		 Bollettino Sismico Italiano INGV 90257071
Reviewed
Rev100 		ML 1.7 2021-05-04
23:23:14		 42.7608 13.1143 11 2021-05-04
23:30:02		 Sala Sismica INGV-Roma 89780321
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-05-04 23:23:14 ± 0.04
Latitude 42.7638 ± 0.0018
Longitude 13.1113 ± 0.0037
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 90257071

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 328
Semi-minor axis of confidence ellipse (meter) 213
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 290
Circular confidence region, given by single value of horizontal uncertainty (meter) 330.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 110
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.38851
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.4
Num. used stations 18
Type of magnitude ML
Reference to an origin 90257071
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-19 10:25:28

ML:1.7

Field Value
Value 1.7
Uncertainty 0.8
Num. used stations 6
Type of magnitude ML
Reference to an origin 89780321
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-05-04 23:30:02
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TOLF.HHE. 2021-05-04T23:23:58.15 3.0 undecidable manual Sg 0.06 0
IV.MPAG.HNZ. 2021-05-04T23:23:47.72 3.0 undecidable manual Sg -2.22 0
IV.TERO.HHZ. 2021-05-04T23:23:28.16 0.1 undecidable manual S 111 43.1235 50 -0.18 93
IV.FDMO.HHZ. 2021-05-04T23:23:24.85 0.1 undecidable manual S 356 30.3474 50 -0.07 97
IV.RM33.EHZ. 2021-05-04T23:23:24.53 0.1 undecidable manual S 163 29.4483 50 -0.17 96
IV.MMO1.EHZ. 2021-05-04T23:23:23.12 0.1 undecidable manual S 49 23.0547 50 0.12 98
IV.SMA1.EHZ. 2021-05-04T23:23:23.25 0.1 undecidable manual S 129 23.4543 50 0.15 97
IV.GAVE.EHZ. 2021-05-04T23:23:22.04 0.1 undecidable manual S 246 19.3695 50 0.03 99
IV.TERO.HHZ. 2021-05-04T23:23:22.50 0.1 undecidable manual P 111 43.1235 50 0.09 95
IV.MC2.EHZ. 2021-05-04T23:23:21.52 0.1 undecidable manual S 21 17.5713 122 0.06 99
IV.RM33.EHZ. 2021-05-04T23:23:20.30 0.1 undecidable manual P 163 29.4483 50 -0.01 99
IV.FDMO.HHZ. 2021-05-04T23:23:20.36 0.1 undecidable manual P 356 30.3474 50 -0.08 97
IV.SMA1.EHZ. 2021-05-04T23:23:19.36 0.1 undecidable manual P 129 23.4543 50 -0.03 100
IV.MMO1.EHZ. 2021-05-04T23:23:19.37 0.1 undecidable manual P 49 23.0547 50 0.04 99
IV.MC2.EHZ. 2021-05-04T23:23:18.62 1.0 negative manual P 21 17.5713 122 0.17 24
IV.GAVE.EHZ. 2021-05-04T23:23:18.88 0.1 undecidable manual P 246 19.3695 50 0.13 98
IV.NRCA.HHN. 2021-05-04T23:23:18.66 0.1 undecidable manual S 2 7.7811 144 -0.27 98
IV.NRCA.HHN. 2021-05-04T23:23:17.08 0.1 negative manual P 2 7.7811 144 0.1 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.0 0.0001297757 0.1792 AML other m 2021-05-04T23:23:18.82
IV.NRCA.HHN. ML:0.7 0.00007092307 0.1024 AML other m 2021-05-04T23:23:19.58
IV.NRCA.HNE. ML:1.0 0.00014881213500000001 0.9984 AML other m 2021-05-04T23:23:17.66
IV.NRCA.HNN. ML:1.2 0.00020060925 0.7808 AML other m 2021-05-04T23:23:20.90
IV.GAVE.HNE. ML:1.2 0.00013055245 1.2288 AML other m 2021-05-04T23:23:28.68
IV.GAVE.EHN. ML:0.5 0.00002283309 0.1792 AML other m 2021-05-04T23:23:22.45
IV.GAVE.EHE. ML:0.4 0.00001908576975 5.0304 AML other m 2021-05-04T23:23:19.68
IV.GAVE.HNN. ML:1.3 0.00014441914999999998 2.1248 AML other m 2021-05-04T23:23:24.58
IV.SMA1.EHE. ML:0.4 0.000015607025 1.7024 AML other m 2021-05-04T23:23:19.60
IV.RM33.EHN. ML:0.5 0.000015176895 2.1376 AML other m 2021-05-04T23:23:25.08
IV.RM33.EHE. ML:0.5 0.000013040526 3.3152 AML other m 2021-05-04T23:23:24.73
IV.RM33.HNN. ML:1.5 0.00015997135 0.9984 AML other m 2021-05-04T23:23:30.96
IV.RM33.HNE. ML:1.5 0.00015262595 2.7136 AML other m 2021-05-04T23:23:22.46
IV.FDMO.HHE. ML:0.3 0.000009570986 0.1152 AML other m 2021-05-04T23:23:25.51
IV.FDMO.HHN. ML:0.3 0.00001025053 0.3072 AML other m 2021-05-04T23:23:25.83
IV.TERO.HHN. ML:0.7 0.000013923560000000002 3.4816 AML other m 2021-05-04T23:23:21.53
IV.TERO.HNN. ML:1.8 0.0001782807 0.8064 AML other m 2021-05-04T23:23:29.61
IV.TERO.HHE. ML:0.2 0.000006410535 0.96 AML other m 2021-05-04T23:23:29.48
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