Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 06-10-2021 and time 07:15:21 (Italy) in region 4 km E Norcia (PG)

A magnitude ML 1.7 earthquake occured in region: 4 km E Norcia (PG), on

  • 06-10-2021 05:15:21 (UTC)
  • 06-10-2021 07:15:21 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8040, 13.1470 at 8 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 5 4957 4957
Castelsantangelo sul Nera MC 10 281 5238
Preci PG 12 724 5962
Arquata del Tronto AP 13 1178 7140
Cascia PG 14 3217 10357
Accumoli RI 15 667 11024
Visso MC 15 1107 12131
Ussita MC 16 444 12575
Montegallo AP 16 523 13098
Montemonaco AP 18 604 13702
Cerreto di Spoleto PG 19 1075 14777

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km E of Foligno (57155 inhabitants)
48 Km W of Teramo (54892 inhabitants)
49 Km NE of Terni (111501 inhabitants)
54 Km NW of L'Aquila (69753 inhabitants)
70 Km E of Perugia (166134 inhabitants)
88 Km W of Montesilvano (53738 inhabitants)
95 Km W of Pescara (121014 inhabitants)
95 Km E of Viterbo (67173 inhabitants)
95 Km SW of Ancona (100861 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
98 Km N of Tivoli (56533 inhabitants)
98 Km NW 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 		Md 1.8
ML 1.7 		2021-10-06
05:15:21		 42.8037 13.1467 8 2022-03-30
13:04:13		 Bollettino Sismico Italiano INGV 96880561
Reviewed
Rev100 		ML 1.7 2021-10-06
05:15:21		 42.8007 13.1427 9 2021-10-06
05:20:30		 Sala Sismica INGV-Roma 96279331
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-06 05:15:21 ± 0.05
Latitude 42.8037 ± 0.0027
Longitude 13.1467 ± 0.0049
Depth (km) 8 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 96880561

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 294
Semi-minor axis of confidence ellipse (meter) 240
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 251
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) 50
Number of associated phases, regardless of their use for origin computation 39
Number of defining phases 39
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.03777
Epicentral distance of station farthest from the epicenter (degree) 0.42988
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 20
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 96279331
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-06 05:20:30

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 96880561
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-16 10:40:15

Md:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 7
Type of magnitude Md
Reference to an origin 96880561
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-16 10:40:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ASSB.HHN. 2021-10-06T05:15:37.30 0.6 undecidable manual S 304 47.7189 50 -0.04 48
IV.MOMA.HNZ. 2021-10-06T05:15:37.97 0.6 undecidable manual S 270 46.9197 50 0.83 38
IV.MML1.EHZ. 2021-10-06T05:15:34.52 0.3 undecidable manual S 338 37.2294 50 -0.02 74
IV.CAMP.HHE. 2021-10-06T05:15:33.90 0.6 undecidable manual S 144 36.6411 50 -0.48 45
IV.RM33.EHZ. 2021-10-06T05:15:33.06 0.6 undecidable manual S 170 33.1446 104 -0.34 46
IV.GUMA.HNN. 2021-10-06T05:15:33.48 0.6 undecidable manual S 28 32.5452 104 0.28 47
IV.MF5.EHN. 2021-10-06T05:15:33.93 0.6 undecidable manual S 51 32.6451 104 0.71 41
IV.CESI.HHZ. 2021-10-06T05:15:32.32 0.6 undecidable manual S 319 29.748 106 0.06 49
IV.CSP1.EHE. 2021-10-06T05:15:32.96 0.6 undecidable manual S 8 32.3454 104 -0.16 48
IV.MOMA.HNZ. 2021-10-06T05:15:30.89 0.3 undecidable manual P 270 46.9197 50 0.34 68
IV.T1299.HNN. 2021-10-06T05:15:30.22 0.6 undecidable manual S 150 21.7671 111 0.59 44
IT.MTCL.HGZ. 2021-10-06T05:15:30.18 0.6 undecidable manual S 331 24.2535 109 -0.26 48
IV.ASSB.HHN. 2021-10-06T05:15:30.46 0.1 undecidable manual P 304 47.7189 50 -0.2 93
IV.LNSS.HHZ. 2021-10-06T05:15:30.58 0.6 undecidable manual S 201 23.8539 109 0.26 48
IV.SMA1.EHN. 2021-10-06T05:15:30.36 0.6 undecidable manual S 141 24.5532 109 -0.19 48
IV.GAVE.EHN. 2021-10-06T05:15:30.63 0.6 undecidable manual S 239 23.9538 109 0.28 48
IV.ARRO.EHZ. 2021-10-06T05:15:29.52 0.3 undecidable manual P 231 39.8268 50 0.07 73
IV.FEMA.HNE. 2021-10-06T05:15:29.15 0.6 undecidable manual S 336 19.2696 113 0.33 47
IV.MTRA.EHZ. 2021-10-06T05:15:29.59 0.3 undecidable manual S 104 20.9679 112 0.22 73
IV.CAMP.HHE. 2021-10-06T05:15:28.48 0.3 undecidable manual P 144 36.6411 50 -0.47 67
IV.MMO1.EHN. 2021-10-06T05:15:28.20 0.6 undecidable manual S 54 18.0708 115 -0.25 48
IV.GUMA.HNN. 2021-10-06T05:15:28.25 0.3 undecidable manual P 28 32.5452 104 -0.02 74
IV.MF5.EHN. 2021-10-06T05:15:28.45 0.1 undecidable manual P 51 32.6451 104 0.16 96
IV.MML1.EHZ. 2021-10-06T05:15:28.69 0.3 undecidable manual P 338 37.2294 50 -0.36 69
IV.RM33.EHZ. 2021-10-06T05:15:28.08 0.3 undecidable manual P 170 33.1446 104 -0.31 70
IV.MC2.EHZ. 2021-10-06T05:15:27.08 0.6 undecidable manual S 16 12.4764 124 0.35 48
IV.CESI.HHZ. 2021-10-06T05:15:27.60 0.1 undecidable manual P 319 29.748 106 -0.13 97
IV.CSP1.EHE. 2021-10-06T05:15:27.98 0.1 undecidable manual P 8 32.3454 104 -0.24 95
IV.LNSS.HHZ. 2021-10-06T05:15:26.65 0.3 undecidable manual P 201 23.8539 109 0.04 75
IV.SMA1.EHN. 2021-10-06T05:15:26.68 0.1 undecidable manual P 141 24.5532 109 -0.06 100
IV.GAVE.EHN. 2021-10-06T05:15:26.79 0.3 undecidable manual P 239 23.9538 109 0.16 73
IV.MTRA.EHZ. 2021-10-06T05:15:26.13 0.3 undecidable manual P 104 20.9679 112 0.07 75
IV.T1299.HNN. 2021-10-06T05:15:26.43 0.1 undecidable manual P 150 21.7671 111 0.22 97
IV.FEMA.HNE. 2021-10-06T05:15:26.19 0.3 undecidable manual P 336 19.2696 113 0.45 69
IT.MTCL.HGZ. 2021-10-06T05:15:26.54 0.3 undecidable manual P 331 24.2535 109 -0.14 74
IV.MMO1.EHN. 2021-10-06T05:15:25.42 0.1 undecidable manual P 54 18.0708 115 -0.11 100
IV.MC2.EHZ. 2021-10-06T05:15:24.73 0.1 positive manual P 16 12.4764 124 0.19 99
IV.NRCA.HNZ. 2021-10-06T05:15:23.20 0.1 undecidable manual P 322 4.1958 153 -0.21 100
IV.NRCA.HNZ. 2021-10-06T05:15:23.98 0.3 undecidable manual S 322 4.1958 153 -0.79 63
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.EHN. ML:1.8 0.000524 0.4 AML other m 2021-10-06T05:15:30.42
IV.MTRA.EHE. ML:2.0 0.0007844999999999999 0.16 AML other m 2021-10-06T05:15:30.76
IV.LNSS.HHN. ML:1.8 0.0003525 0.92 AML other m 2021-10-06T05:15:31.49
IV.LNSS.HHE. ML:1.7 0.0002925 0.8 AML other m 2021-10-06T05:15:31.53
IV.RM33.EHN. ML:1.6 0.0001615 0.96 AML other m 2021-10-06T05:15:33.77
IV.CESI.HHN. ML:1.8 0.0003035 0.86 AML other m 2021-10-06T05:15:34.97
IV.MML1.EHN. ML:1.4 0.0001055 0.72 AML other m 2021-10-06T05:15:34.71
IV.RM33.EHE. ML:1.5 0.000141 1.02 AML other m 2021-10-06T05:15:34.74
IV.CESI.HHE. ML:1.6 0.0001785 1.58 AML other m 2021-10-06T05:15:36.87
IV.MML1.EHE. ML:1.4 0.00009945 0.28 AML other m 2021-10-06T05:15:36.31
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