Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 28-09-2021 and time 21:16:41 (Italy) in region 7 km E Norcia (PG)

A magnitude ML 1.2 earthquake occured in region: 7 km E Norcia (PG), on

  • 28-09-2021 19:16:41 (UTC)
  • 28-09-2021 21:16:41 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8120, 13.1740 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 7 4957 4957
Castelsantangelo sul Nera MC 9 281 5238
Arquata del Tronto AP 11 1178 6416
Preci PG 13 724 7140
Montegallo AP 14 523 7663
Accumoli RI 14 667 8330
Ussita MC 15 444 8774
Visso MC 15 1107 9881
Montemonaco AP 16 604 10485
Cascia PG 17 3217 13702
Acquasanta Terme AP 20 2916 16618

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km E of Foligno (57155 inhabitants)
47 Km W of Teramo (54892 inhabitants)
51 Km NE of Terni (111501 inhabitants)
54 Km NW of L'Aquila (69753 inhabitants)
72 Km E of Perugia (166134 inhabitants)
86 Km W of Montesilvano (53738 inhabitants)
94 Km W of Pescara (121014 inhabitants)
94 Km SW of Ancona (100861 inhabitants)
96 Km NW of Chieti (51815 inhabitants)
97 Km NE of Guidonia Montecelio (88673 inhabitants)
98 Km E of Viterbo (67173 inhabitants)
99 Km NE of Tivoli (56533 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 1.2 2021-09-28
19:16:41		 42.8122 13.1738 11 2022-03-30
13:04:10		 Bollettino Sismico Italiano INGV 96314951
Reviewed
Rev100 		ML 1.6 2021-09-28
19:16:41		 42.8177 13.1887 14 2021-09-28
19:24:56		 Sala Sismica INGV-Roma 96006591
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-28 19:16:41 ± 0.06
Latitude 42.8122 ± 0.0018
Longitude 13.1738 ± 0.0037
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 96314951

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 320
Semi-minor axis of confidence ellipse (meter) 24
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 76
Circular confidence region, given by single value of horizontal uncertainty (meter) 320.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 91
Number of associated phases, regardless of their use for origin computation 33
Number of defining phases 18
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.36782
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.0
Num. used stations 2
Type of magnitude ML
Reference to an origin 96006591
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-28 19:24:56

ML:1.2

Field Value
Value 1.2
Uncertainty 0.4
Num. used stations 10
Type of magnitude ML
Reference to an origin 96314951
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-07 10:35:01
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
SL.LJU.BHZ. 2021-09-28T19:18:32.07 3.0 undecidable manual Sg 13.98 0
CR.STON.BHZ. 2021-09-28T19:18:22.62 3.0 undecidable manual Sn 5.83 0
IV.ESCV.HHZ. 2021-09-28T19:18:12.48 3.0 positive manual Pg 15.3 0
IV.EFIU.HHZ. 2021-09-28T19:18:11.66 3.0 undecidable manual Pg 13.82 0
IV.MMGO.HHZ. 2021-09-28T19:18:06.44 3.0 undecidable manual Pg 10.68 0
IV.CRJA.HHZ. 2021-09-28T19:17:55.87 3.0 undecidable manual Pn 2.02 0
IV.IVPL.HHZ. 2021-09-28T19:17:49.58 3.0 negative manual Pn 0.15 0
GU.CANO.HHZ. 2021-09-28T19:17:47.54 3.0 negative manual Pg 8.95 0
IV.PAOL.HHZ. 2021-09-28T19:17:47.21 3.0 undecidable manual Sg 4.97 0
IX.PGN3.HHZ.02 2021-09-28T19:17:27.62 3.0 undecidable manual Pn 0.1 0
IV.TREG.EHZ. 2021-09-28T19:17:26.21 3.0 negative manual Pn -3.11 0
IV.SBPO.HNZ. 2021-09-28T19:17:24.00 3.0 negative manual Pn -0.86 0
IV.BRSN.HNZ. 2021-09-28T19:17:11.91 3.0 undecidable manual Pg 1.79 0
IV.MML1.EHZ. 2021-09-28T19:16:53.83 0.3 undecidable manual S 334 37.2294 91 0.25 68
IV.CSP1.EHZ. 2021-09-28T19:16:51.91 0.1 undecidable manual S 5 31.1466 91 -0.04 97
IV.LNSS.HNZ. 2021-09-28T19:16:50.38 0.1 undecidable manual S 205 25.6521 91 -0.1 98
IV.FDMO.HHZ. 2021-09-28T19:16:50.43 0.3 undecidable manual S 344 25.8519 91 -0.11 73
IV.T1299.HNN. 2021-09-28T19:16:49.51 0.1 undecidable manual S 156 21.6672 92 0.1 97
IV.MTRA.EHZ. 2021-09-28T19:16:48.57 0.1 undecidable manual S 109 19.1697 93 -0.18 95
IV.MML1.EHZ. 2021-09-28T19:16:48.25 0.1 undecidable manual P 334 37.2294 91 -0.09 95
IV.TERO.HHZ. 2021-09-28T19:16:48.89 3.0 undecidable manual P 40.8258 0 0
IV.MMO1.EHZ. 2021-09-28T19:16:47.73 0.3 undecidable manual S 52 15.7731 96 -0.12 73
IV.CSP1.EHZ. 2021-09-28T19:16:47.21 0.1 undecidable manual P 5 31.1466 91 -0.19 94
IV.LNSS.HNZ. 2021-09-28T19:16:46.62 0.1 undecidable manual P 205 25.6521 91 0.07 96
IV.MC2.EHZ. 2021-09-28T19:16:46.95 0.1 undecidable manual S 6 11.0778 116 0.3 96
IV.T1299.HNN. 2021-09-28T19:16:46.06 0.1 undecidable manual P 156 21.6672 92 0.13 96
IV.FDMO.HHZ. 2021-09-28T19:16:46.34 0.1 undecidable manual P 344 25.8519 91 -0.24 94
IV.NRCA.HHZ. 2021-09-28T19:16:45.38 0.1 undecidable manual S 296 5.3946 146 -0.14 99
IV.MMO1.EHZ. 2021-09-28T19:16:45.01 0.1 undecidable manual P 52 15.7731 96 -0.02 99
IV.MTRA.EHZ. 2021-09-28T19:16:45.66 0.1 undecidable manual P 109 19.1697 93 0.11 98
IV.MC2.EHZ. 2021-09-28T19:16:44.51 0.1 undecidable manual P 6 11.0778 116 0.17 98
IV.NRCA.HHZ. 2021-09-28T19:16:43.78 0.1 undecidable manual P 296 5.3946 146 0.1 100
IV.ARRO.EHZ. 2021-09-28T19:16:42.96 3.0 undecidable manual P 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARRO.EHE. ML:0.8 0.000018403065 0.1152 AML other m 2021-09-28T19:16:43.64
IV.ARRO.EHN. ML:0.8 0.000022337512499999995 0.1408 AML other m 2021-09-28T19:16:44.41
IV.MTRA.HNN. ML:1.2 0.00013222945 2.624 AML other m 2021-09-28T19:16:45.88
IV.MTRA.EHE. ML:0.7 0.00003695821 0.704 AML other m 2021-09-28T19:16:48.98
IV.MTRA.HNE. ML:1.2 0.00010678424 0.7552 AML other m 2021-09-28T19:16:49.86
IV.MML1.HNN. ML:1.6 0.0001465582 1.792 AML other m 2021-09-28T19:16:49.89
IV.MTRA.EHN. ML:0.5 0.000025028284999999998 0.384 AML other m 2021-09-28T19:16:49.84
IV.TERO.HHE. ML:1.7 0.0001525776 0.7424 AML other m 2021-09-28T19:16:49.79
IV.MML1.HNE. ML:1.6 0.00013514066499999998 3.072 AML other m 2021-09-28T19:16:52.42
IV.TERO.HNN. ML:1.7 0.00016588235000000002 2.2528 AML other m 2021-09-28T19:16:59.33
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