Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 22-09-2021 and time 07:35:20 (Italy) in region 7 km E Norcia (PG)

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

  • 22-09-2021 05:35:20 (UTC)
  • 22-09-2021 07:35:20 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8220, 13.1740 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

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 8 281 5238
Arquata del Tronto AP 11 1178 6416
Preci PG 13 724 7140
Montegallo AP 13 523 7663
Visso MC 14 1107 8770
Ussita MC 14 444 9214
Accumoli RI 15 667 9881
Montemonaco AP 15 604 10485
Cascia PG 17 3217 13702
Montefortino FM 19 1178 14880
Bolognola MC 20 142 15022

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km E of Foligno (57155 inhabitants)
47 Km W of Teramo (54892 inhabitants)
52 Km NE of Terni (111501 inhabitants)
55 Km NW of L'Aquila (69753 inhabitants)
71 Km E of Perugia (166134 inhabitants)
87 Km W of Montesilvano (53738 inhabitants)
93 Km SW of Ancona (100861 inhabitants)
94 Km W of Pescara (121014 inhabitants)
97 Km NW of Chieti (51815 inhabitants)
98 Km E of Viterbo (67173 inhabitants)
98 Km NE of Guidonia Montecelio (88673 inhabitants)
100 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
Reviewed
Rev100 		ML 1.1 2021-09-22
05:35:20		 42.8217 13.174 10 2021-09-22
05:44:57		 Sala Sismica INGV-Roma 95724671
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-22 05:35:20 ± 0.04
Latitude 42.8217 ± 0.0018
Longitude 13.1740 ± 0.0037
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 95724671

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 285
Semi-minor axis of confidence ellipse (meter) 229
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) 290.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 57
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.12
Epicentral distance of station closest to the epicenter (degree) 0.04497
Epicentral distance of station farthest from the epicenter (degree) 0.43707
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.4
Num. used stations 20
Type of magnitude ML
Reference to an origin 95724671
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-22 05:44:57
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-09-22T05:35:31.37 0.3 undecidable manual S 5 30.0477 50 -0.03 74
IV.CESI.HHZ. 2021-09-22T05:35:31.29 0.3 undecidable manual S 313 29.8479 50 -0.05 74
IV.LNSS.HNN. 2021-09-22T05:35:30.60 0.6 undecidable manual S 204 26.6511 50 0.13 49
IV.ASSB.HHZ. 2021-09-22T05:35:29.85 0.6 undecidable manual P 301 48.5181 50 0.15 47
IV.FDMO.HHZ. 2021-09-22T05:35:29.79 0.3 undecidable manual S 344 24.8529 112 -0.18 72
IV.MML1.EHZ. 2021-09-22T05:35:27.79 0.3 undecidable manual P 333 36.3414 50 -0.04 73
IV.GAVE.HNE. 2021-09-22T05:35:26.29 0.6 undecidable manual P 238 26.9508 50 -0.09 49
IV.CESI.HHZ. 2021-09-22T05:35:26.83 0.1 positive manual P 313 29.8479 50 0 99
IV.CSP1.EHZ. 2021-09-22T05:35:26.97 0.6 positive manual P 5 30.0477 50 0.11 48
IV.MMO1.EHZ. 2021-09-22T05:35:26.87 0.3 undecidable manual S 55 15.0738 123 -0.1 75
IV.LNSS.HNN. 2021-09-22T05:35:26.34 0.6 undecidable manual P 204 26.6511 50 0.01 50
IT.MTCL.HGN. 2021-09-22T05:35:25.67 0.3 undecidable manual P 323 23.754 113 -0.17 72
IV.FDMO.HHZ. 2021-09-22T05:35:25.96 0.6 negative manual P 344 24.8529 112 -0.08 49
IV.MC2.EHZ. 2021-09-22T05:35:25.78 0.3 undecidable manual S 7 9.9789 135 0.19 74
IV.SMA1.EHZ. 2021-09-22T05:35:25.94 0.3 undecidable manual P 148 24.9528 112 -0.12 73
IV.MMO1.EHZ. 2021-09-22T05:35:24.32 0.3 undecidable manual P 55 15.0738 123 0.01 76
IV.NRCA.HHZ. 2021-09-22T05:35:24.42 0.3 undecidable manual S 285 4.995 153 -0.14 75
IV.MTRA.HNZ. 2021-09-22T05:35:24.98 0.3 undecidable manual P 112 19.4694 117 -0.09 74
IV.FEMA.HNN. 2021-09-22T05:35:24.95 0.1 undecidable manual P 327 18.5703 118 0.05 100
IV.NRCA.HHZ. 2021-09-22T05:35:23.09 0.3 undecidable manual P 285 4.995 153 0.17 75
IV.MC2.EHZ. 2021-09-22T05:35:23.83 0.3 negative manual P 7 9.9789 135 0.32 72
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.9 0.001326352 0.0992 AML other m 2021-09-22T05:35:24.53
IV.NRCA.HNN. ML:1.8 0.0010682211500000001 0.0992 AML other m 2021-09-22T05:35:24.53
IV.NRCA.HHE. ML:2.1 0.00209 0.16 AML other m 2021-09-22T05:35:24.53
IV.NRCA.HNE. ML:2.1 0.0020299999999999997 0.14 AML other m 2021-09-22T05:35:24.54
IV.CESI.HHE. ML:1.0 0.000050549999999999995 0.2 AML other m 2021-09-22T05:35:31.48
IV.CESI.HHN. ML:1.3 0.00008965000000000001 0.2 AML other m 2021-09-22T05:35:31.64
IV.SMA1.EHE. ML:0.8 0.00003818451000000001 0.8832 AML other m 2021-09-22T05:35:36.77
IV.SMA1.EHN. ML:0.8 0.000032578075 0.4192 AML other m 2021-09-22T05:35:33.73
IV.FDMO.HHE. ML:0.5 0.000018996075 0.1216 AML other m 2021-09-22T05:35:30.74
IV.FDMO.HHN. ML:0.5 0.0000221307815 0.16 AML other m 2021-09-22T05:35:29.84
IV.CESI.HNE. ML:1.3 0.00009868722 0.5408 AML other m 2021-09-22T05:35:32.90
IV.CESI.HNN. ML:1.6 0.00021225505 0.24 AML other m 2021-09-22T05:35:27.01
IV.CSP1.EHE. ML:1.1 0.00006397222999999999 0.7584 AML other m 2021-09-22T05:35:28.78
IV.CSP1.EHN. ML:1.0 0.00004697211 0.4416 AML other m 2021-09-22T05:35:39.88
IV.MML1.HNE. ML:1.5 0.00011316882 0.688 AML other m 2021-09-22T05:35:35.78
IV.MML1.HNN. ML:1.4 0.0001064862 0.5216 AML other m 2021-09-22T05:35:33.17
IV.MML1.EHE. ML:0.7 0.000017903908999999998 0.1792 AML other m 2021-09-22T05:35:33.66
IV.MML1.EHN. ML:0.8 0.000024273883999999998 0.16 AML other m 2021-09-22T05:35:34.06
IV.ASSB.HHE. ML:0.9 0.00001890265 0.2592 AML other m 2021-09-22T05:35:36.68
IV.ASSB.HHN. ML:0.9 0.00002153536 0.16 AML other m 2021-09-22T05:35:37.88
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