Earthquake with magnitude of ML 1.0 on date 28-09-2021 and time 12:28:11 (UTC) in region 4 km E Vallo di Nera (PG)

A magnitude ML 1.0 earthquake occured in region: 4 km E Vallo di Nera (PG), on

  • 28-09-2021 12:28:11 (UTC)
  • 28-09-2021 14:28:11 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7840, 12.9050 at 10 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Vallo di Nera PG 4 364 364
Cerreto di Spoleto PG 4 1075 1439
Sant'Anatolia di Narco PG 8 564 2003
Poggiodomo PG 8 117 2120
Scheggino PG 10 461 2581
Campello sul Clitunno PG 11 2442 5023
Cascia PG 11 3217 8240
Sellano PG 12 1079 9319
Spoleto PG 15 38218 47537
Monteleone di Spoleto PG 15 599 48136
Preci PG 15 724 48860
Norcia PG 15 4957 53817
Trevi PG 17 8469 62286
Castel Ritaldi PG 19 3278 65564

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km SE of Foligno (57155 inhabitants)
33 Km NE of Terni (111501 inhabitants)
55 Km SE of Perugia (166134 inhabitants)
63 Km NW of L'Aquila (69753 inhabitants)
67 Km W of Teramo (54892 inhabitants)
77 Km NE of Viterbo (67173 inhabitants)
88 Km N of Guidonia Montecelio (88673 inhabitants)
92 Km N 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 1.0 2021-09-28
12:28:11
42.7842 12.9053 10 2022-03-30
13:04:10
Bollettino Sismico Italiano INGV 96467661
Reviewed
Rev100
ML 2.1 2021-09-28
12:28:11
42.7772 12.9012 10 2021-09-28
12:36:52
Sala Sismica INGV-Roma 95992171
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-28 12:28:11 ± 0.07
Latitude 42.7842 ± 0.0045
Longitude 12.9053 ± 0.0061
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 96467661

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 497
Semi-minor axis of confidence ellipse (meter) 473
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 143
Circular confidence region, given by single value of horizontal uncertainty (meter) 500.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 90
Number of associated phases, regardless of their use for origin computation 53
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.37772
Number of stations at which the event was observed 42
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.8
Num. used stations 14
Type of magnitude ML
Reference to an origin 95992171
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-28 12:36:52

ML:1.0

Field Value
Value 1.0
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 96467661
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-08 14:10:25
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
HL.VLS.HHZ. 2021-09-28T12:29:52.33 3.0 positive manual Pn -5.01 0
IV.EUCT.HNZ. 2021-09-28T12:29:48.88 3.0 undecidable manual Sg 11.12 0
MN.TRI.HHZ. 2021-09-28T12:29:45.86 3.0 undecidable manual Sg 14.01 0
IX.SCL3.EHZ.02 2021-09-28T12:29:44.86 3.0 undecidable manual Sg 14.38 0
OX.CIMO.HHZ. 2021-09-28T12:29:43.25 3.0 undecidable manual Sn 0.75 0
IV.EVRN.HHZ. 2021-09-28T12:29:42.01 3.0 negative manual Pg 16.34 0
IV.MTTG.HHZ. 2021-09-28T12:29:34.78 3.0 undecidable manual Pg 10.44 0
GU.LSD.HHZ. 2021-09-28T12:29:24.01 3.0 undecidable manual Pg 9.23 0
IV.TREG.EHZ. 2021-09-28T12:29:24.65 3.0 undecidable manual Sn -1.7 0
IV.CSLB.HHZ. 2021-09-28T12:29:23.76 3.0 positive manual Pg 5.06 0
IV.PETRA.HHZ. 2021-09-28T12:29:23.31 3.0 undecidable manual Pg 3.07 0
MN.PDG.HHZ. 2021-09-28T12:29:21.98 3.0 positive manual Pn 0.91 0
IV.MNTV.EHZ. 2021-09-28T12:29:19.50 3.0 undecidable manual Sn -0.68 0
IV.ILOS.HHZ. 2021-09-28T12:29:17.58 3.0 negative manual Pg 2.25 0
IV.IACL.HHZ. 2021-09-28T12:29:14.10 3.0 negative manual Pg 2.26 0
SL.BOJS.BHZ. 2021-09-28T12:29:11.67 3.0 undecidable manual Pg 12.96 0
IV.SBPO.HNZ. 2021-09-28T12:29:10.95 3.0 undecidable manual Sn -6.09 0
IV.MTGR.HHZ. 2021-09-28T12:29:09.09 3.0 negative manual Pn -7.95 0
IV.EUCT.HNZ. 2021-09-28T12:29:03.29 3.0 positive manual Pg 5.69 0
NI.VINO.HHZ. 2021-09-28T12:29:02.92 3.0 positive manual Pn 2.62 0
IT.PLTA.HNZ. 2021-09-28T12:29:01.29 3.0 undecidable manual Sn -1.82 0
GU.BURY.HHZ. 2021-09-28T12:28:56.21 3.0 undecidable manual Pn -4.94 0
IV.CADC.EHZ. 2021-09-28T12:28:51.07 3.0 positive manual Pn -3.38 0
IV.OVO.HHZ. 2021-09-28T12:28:51.70 3.0 undecidable manual Pg 7.56 0
IV.POFI.HHZ. 2021-09-28T12:28:49.12 3.0 undecidable manual Sg -0.05 0
IV.VTIR.HHZ. 2021-09-28T12:28:41.35 3.0 positive manual Pn -3.21 0
IV.MNTT.EHZ. 2021-09-28T12:28:35.45 3.0 undecidable manual Sn -3.04 0
IV.PP3.EHZ. 2021-09-28T12:28:31.90 3.0 negative manual Pg 5.43 0
IV.BRSN.EHZ. 2021-09-28T12:28:29.17 3.0 negative manual Pn -3.43 0
IV.CRTC.HHZ. 2021-09-28T12:28:27.57 3.0 undecidable manual Pg 1.26 0
IV.CSP1.EHZ. 2021-09-28T12:28:26.25 0.6 undecidable manual S 35 41.9247 50 0.54 42
IV.RMP.HHZ. 2021-09-28T12:28:26.39 3.0 undecidable manual Sn -9.99 0
IV.VVLD.HHZ. 2021-09-28T12:28:24.75 3.0 undecidable manual Pn -3.45 0
IV.MML1.HNE. 2021-09-28T12:28:24.57 0.6 undecidable manual S 8 36.9297 50 0.19 46
IV.ASSB.HHN. 2021-09-28T12:28:23.46 0.6 undecidable manual S 325 34.9428 50 -0.4 45
IV.FDMO.HHZ. 2021-09-28T12:28:22.94 0.3 undecidable manual S 28 31.6461 50 -0.04 73
IV.MOMA.HNE. 2021-09-28T12:28:21.60 0.6 undecidable manual S 275 27.3504 109 -0.2 48
IV.MC2.EHZ. 2021-09-28T12:28:21.72 0.6 undecidable manual S 58 27.0507 110 0.03 49
IV.CESI.HHZ. 2021-09-28T12:28:20.92 0.6 undecidable manual S 360 24.4533 111 0.06 49
IV.LNSS.HHZ. 2021-09-28T12:28:20.21 0.3 undecidable manual S 151 22.9548 113 -0.15 73
IV.CSP1.EHZ. 2021-09-28T12:28:19.87 0.1 undecidable manual P 35 41.9247 50 0.06 94
IV.NRCA.HHZ. 2021-09-28T12:28:18.80 0.3 undecidable manual S 72 17.871 118 0.03 75
IV.MOMA.HNE. 2021-09-28T12:28:18.46 0.3 undecidable manual P 275 27.3504 109 0.91 56
IV.MML1.HNE. 2021-09-28T12:28:18.90 0.1 undecidable manual P 8 36.9297 50 -0.14 95
IV.FDMO.HHZ. 2021-09-28T12:28:18.06 0.1 undecidable manual P 28 31.6461 50 -0.17 95
IV.ATMI.HHZ. 2021-09-28T12:28:18.39 3.0 positive manual P -0.61 0
IV.ASSB.HHN. 2021-09-28T12:28:18.44 0.3 undecidable manual P 325 34.9428 50 -0.3 69
IV.MC2.EHZ. 2021-09-28T12:28:17.50 0.3 undecidable manual P 58 27.0507 110 0.01 74
IV.LNSS.HHZ. 2021-09-28T12:28:16.61 0.1 undecidable manual P 151 22.9548 113 -0.11 98
IV.CESI.HHZ. 2021-09-28T12:28:16.96 0.1 undecidable manual P 360 24.4533 111 -0.04 97
IV.GAVE.EHZ. 2021-09-28T12:28:16.59 0.3 undecidable manual S 185 10.2786 133 -0.02 76
IV.NRCA.HHZ. 2021-09-28T12:28:15.81 0.1 undecidable manual P 72 17.871 118 0.01 100
IV.GAVE.EHZ. 2021-09-28T12:28:14.71 0.1 positive manual P 185 10.2786 133 0.16 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHN. ML:1.2 0.0002115 0.82 AML other m 2021-09-28T12:28:16.64
IV.GAVE.EHE. ML:1.2 0.000224 1.52 AML other m 2021-09-28T12:28:16.89
IV.NRCA.HHN. ML:1.1 0.0001033 0.08 AML other m 2021-09-28T12:28:19.41
IV.NRCA.HHE. ML:1.0 0.0000862 0.1 AML other m 2021-09-28T12:28:20.32
IV.CESI.HHE. ML:0.8 0.00003345 0.76 AML other m 2021-09-28T12:28:21.12
IV.CESI.HHN. ML:0.9 0.00004295 1.64 AML other m 2021-09-28T12:28:23.17
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
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