Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 12-09-2021 and time 03:36:03 (UTC) in region 2 km N Vallo di Nera (PG)

A magnitude ML 0.9 earthquake occured in region: 2 km N Vallo di Nera (PG), on

  • 12-09-2021 03:36:03 (UTC)
  • 12-09-2021 05:36:03 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7880, 12.8580 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.

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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
Vallo di Nera PG 2 364 364
Cerreto di Spoleto PG 6 1075 1439
Sant'Anatolia di Narco PG 6 564 2003
Campello sul Clitunno PG 8 2442 4445
Scheggino PG 9 461 4906
Poggiodomo PG 11 117 5023
Spoleto PG 11 38218 43241
Sellano PG 13 1079 44320
Trevi PG 13 8469 52789
Cascia PG 15 3217 56006
Castel Ritaldi PG 16 3278 59284
Monteleone di Spoleto PG 17 599 59883
Preci PG 18 724 60607
Norcia PG 19 4957 65564
Ferentillo TR 19 1913 67477

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km SE of Foligno (57155 inhabitants)
31 Km NE of Terni (111501 inhabitants)
52 Km SE of Perugia (166134 inhabitants)
66 Km NW of L'Aquila (69753 inhabitants)
71 Km W of Teramo (54892 inhabitants)
74 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 0.9 2021-09-12
03:36:03		 42.7885 12.8577 10 2022-03-30
13:04:22		 Bollettino Sismico Italiano INGV 98593101
Reviewed
Rev100 		ML 0.9 2021-09-12
03:36:03		 42.791 12.8583 11 2021-09-12
03:42:38		 Sala Sismica INGV-Roma 95328471
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-12 03:36:03 ± 0.06
Latitude 42.7885 ± 0.0027
Longitude 12.8577 ± 0.0049
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 98593101

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 381
Semi-minor axis of confidence ellipse (meter) 212
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 117
Circular confidence region, given by single value of horizontal uncertainty (meter) 380.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 68
Number of associated phases, regardless of their use for origin computation 33
Number of defining phases 21
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) 0.33545
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.1
Num. used stations 2
Type of magnitude ML
Reference to an origin 95328471
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-12 03:42:38

ML:0.9

Field Value
Value 0.9
Uncertainty 0.1
Num. used stations 2
Type of magnitude ML
Reference to an origin 98593101
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-16 15:29:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.RNCA.HHZ. 2021-09-12T03:37:49.21 3.0 undecidable manual Sg 12.13 0
IV.CDRU.HHZ. 2021-09-12T03:37:38.01 3.0 undecidable manual Sg 8.23 0
IX.PGN3.HHZ.02 2021-09-12T03:37:32.50 3.0 undecidable manual Sn -1.82 0
MN.TRI.HHZ. 2021-09-12T03:37:30.49 3.0 undecidable manual Sn 0.11 0
IV.MTGR.HHZ. 2021-09-12T03:37:25.42 3.0 positive manual Pg 6.84 0
IV.ESCV.HHZ. 2021-09-12T03:37:21.55 3.0 positive manual Pn -2.16 0
IV.COLB.HHZ. 2021-09-12T03:37:11.85 3.0 undecidable manual Sn 0.46 0
GU.MGRO.HHZ. 2021-09-12T03:37:06.82 3.0 negative manual Pn 2.56 0
IV.FIR.HHZ. 2021-09-12T03:36:54.75 3.0 undecidable manual S 0.82 0
IV.BLLA.EHZ. 2021-09-12T03:36:46.17 3.0 undecidable manual S -4.59 0
IV.MCIV.CHZ. 2021-09-12T03:36:22.12 3.0 positive manual P 0.68 0
IV.APEC.HHZ. 2021-09-12T03:36:19.95 3.0 undecidable manual P -1.09 0
IV.MML1.HNE. 2021-09-12T03:36:16.07 0.6 undecidable manual S 14 37.2294 50 0 49
IV.FDMO.HHZ. 2021-09-12T03:36:15.06 0.3 undecidable manual S 34 33.2445 50 0.05 74
IV.ASSB.HHZ. 2021-09-12T03:36:14.66 0.3 undecidable manual S 330 32.4453 50 -0.14 72
IV.MC2.EHZ. 2021-09-12T03:36:14.44 0.6 undecidable manual S 63 30.2475 50 0.25 47
IV.CESX.HHE. 2021-09-12T03:36:13.85 0.6 undecidable manual S 228 29.748 50 -0.23 48
IV.LNSS.HNZ. 2021-09-12T03:36:12.81 0.6 undecidable manual S 144 25.4523 50 -0.11 49
IV.CESI.HHZ. 2021-09-12T03:36:12.75 0.3 undecidable manual S 9 24.3534 50 0.13 74
IV.ARRO.EHZ. 2021-09-12T03:36:12.70 0.3 undecidable manual S 198 24.3534 50 0.05 75
IV.NRCA.HHZ. 2021-09-12T03:36:11.58 0.6 undecidable manual S 76 21.4674 116 -0.19 49
IV.MML1.HNE. 2021-09-12T03:36:10.64 0.1 undecidable manual P 14 37.2294 50 -0.12 96
IV.FDMO.HHZ. 2021-09-12T03:36:10.10 0.3 undecidable manual P 34 33.2445 50 -0.05 74
IV.MC2.EHZ. 2021-09-12T03:36:09.97 0.3 undecidable manual P 63 30.2475 50 0.29 70
IV.ASSB.HHZ. 2021-09-12T03:36:09.96 0.3 undecidable manual P 330 32.4453 50 -0.07 73
IV.CESX.HHE. 2021-09-12T03:36:09.53 0.1 undecidable manual P 228 29.748 50 -0.08 98
IV.CESI.HHZ. 2021-09-12T03:36:08.86 0.1 undecidable manual P 9 24.3534 50 0.09 99
IV.ARRO.EHZ. 2021-09-12T03:36:08.75 0.1 undecidable manual P 198 24.3534 50 -0.03 100
IV.MOMA.HHZ. 2021-09-12T03:36:08.95 0.6 undecidable manual P 274 23.4543 50 0.31 47
IV.GAVE.EHZ. 2021-09-12T03:36:08.87 0.6 undecidable manual S 164 11.0778 133 0.11 50
IV.LNSS.HNZ. 2021-09-12T03:36:08.83 0.1 undecidable manual P 144 25.4523 50 -0.11 98
IV.NRCA.HHZ. 2021-09-12T03:36:07.96 0.1 undecidable manual P 76 21.4674 116 -0.32 95
IV.GAVE.EHZ. 2021-09-12T03:36:06.83 0.1 undecidable manual P 164 11.0778 133 0.29 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHE. ML:0.8 0.0000813 0.16 AML other m 2021-09-12T03:36:09.13
IV.GAVE.EHN. ML:1.0 0.00010775 0.62 AML other m 2021-09-12T03:36:09.45
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