Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 20-09-2021 and time 23:31:25 (Italy) in region 2 km S Fanna (PN)

A magnitude ML 1.2 earthquake occured in region: 2 km S Fanna (PN), on

  • 20-09-2021 21:31:25 (UTC)
  • 20-09-2021 23:31:25 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 46.1720, 12.7570 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
Fanna PN 2 1583 1583
Cavasso Nuovo PN 3 1525 3108
Maniago PN 4 11698 14806
Arba PN 4 1309 16115
Frisanco PN 5 622 16737
Vajont PN 5 1719 18456
Sequals PN 5 2200 20656
Meduno PN 6 1574 22230
Montereale Valcellina PN 8 4433 26663
Travesio PN 9 1776 28439
Vivaro PN 11 1352 29791
Andreis PN 11 259 30050
Castelnovo del Friuli PN 12 880 30930
Tramonti di Sotto PN 13 387 31317
Spilimbergo PN 13 12124 43441
Clauzetto PN 14 380 43821
Pinzano al Tagliamento PN 15 1525 45346
Barcis PN 15 256 45602
Tramonti di Sopra PN 16 321 45923
San Quirino PN 16 4383 50306
San Giorgio della Richinvelda PN 16 4650 54956
Dignano UD 17 2317 57273
Vito d'Asio PN 17 769 58042
Ragogna UD 17 2909 60951
Forgaria nel Friuli UD 17 1786 62737
Aviano PN 17 9106 71843
San Martino al Tagliamento PN 19 1468 73311
San Daniele del Friuli UD 20 8013 81324

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km NE of Pordenone (51229 inhabitants)
39 Km W of Udine (99169 inhabitants)
69 Km NE of Treviso (83731 inhabitants)
88 Km NE of Venezia (263352 inhabitants)
97 Km NW of Trieste (204420 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 2021-09-20
21:31:25		 46.1722 12.7572 11 2022-03-30
13:04:38		 Bollettino Sismico Italiano INGV 101116941
Reviewed
Rev100 		ML 1.3 2021-09-20
21:31:25		 46.1597 12.7407 17 2021-09-20
21:48:06		 Sala Sismica INGV-Roma 95677531
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-20 21:31:25 ± 0.11
Latitude 46.1722 ± 0.0090
Longitude 12.7572 ± 0.0078
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 101116941

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1042
Semi-minor axis of confidence ellipse (meter) 388
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 339
Circular confidence region, given by single value of horizontal uncertainty (meter) 1040.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 155
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) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.09353
Epicentral distance of station farthest from the epicenter (degree) 0.46315
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 20
Type of magnitude ML
Reference to an origin 101116941
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-18 17:03:51

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 20
Type of magnitude ML
Reference to an origin 95677531
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-20 21:48:06
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
OX.BAD.HNE. 2021-09-20T21:31:38.60 0.6 undecidable manual S 79 38.0286 50 0.15 47
OX.CLUD.HHE. 2021-09-20T21:31:37.55 0.6 undecidable manual S 17 33.0447 50 0.43 46
OX.BOO.HHE. 2021-09-20T21:31:36.70 0.6 undecidable manual S 58 30.8469 50 0.15 48
OX.CAE.HHZ. 2021-09-20T21:31:36.88 0.6 undecidable manual S 234 30.5472 50 0.43 46
OX.PLRO.HNZ. 2021-09-20T21:31:35.44 0.3 undecidable manual P 35 51.4152 50 0.24 68
OX.CIMO.HHZ. 2021-09-20T21:31:35.69 0.6 undecidable manual S 303 28.5492 50 -0.24 45
IV.FREG.EHE. 2021-09-20T21:31:34.31 0.3 undecidable manual P 243 38.5281 50 1.1 52
IV.FVI.HHZ. 2021-09-20T21:31:34.62 0.3 undecidable manual P 2 47.1195 50 0.08 71
OX.MPRI.HHZ. 2021-09-20T21:31:34.32 0.6 undecidable manual S 67 19.2696 50 0.86 38
NI.VINO.HHZ. 2021-09-20T21:31:33.21 0.3 undecidable manual P 77 40.8258 50 -0.35 67
OX.BAD.HNE. 2021-09-20T21:31:32.74 0.3 undecidable manual P 79 38.0286 50 -0.39 67
OX.CLUD.HHE. 2021-09-20T21:31:32.22 0.3 undecidable manual P 17 33.0447 50 -0.14 71
RF.GEPF.HHZ. 2021-09-20T21:31:31.93 0.3 undecidable manual P 69 31.4463 50 -0.19 71
IV.STAL.HHZ. 2021-09-20T21:31:31.51 0.6 undecidable manual S 340 10.3785 137 0.39 45
OX.CIMO.HHZ. 2021-09-20T21:31:31.29 0.3 undecidable manual P 303 28.5492 50 -0.38 67
OX.MLN.HHZ. 2021-09-20T21:31:31.32 0.6 undecidable manual S 257 11.1777 135 0.01 49
OX.BOO.HHE. 2021-09-20T21:31:31.81 0.1 undecidable manual P 58 30.8469 50 -0.22 94
OX.CAE.HHZ. 2021-09-20T21:31:31.86 0.6 negative manual P 234 30.5472 50 -0.12 71
OX.MPRI.HHZ. 2021-09-20T21:31:30.33 0.1 undecidable manual P 67 19.2696 50 0.09 97
IV.STAL.HHZ. 2021-09-20T21:31:28.71 0.1 undecidable manual P 340 10.3785 137 -0.18 100
OX.MLN.HHZ. 2021-09-20T21:31:28.72 0.1 undecidable manual P 257 11.1777 135 -0.28 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.STAL.HNN. ML:1.6 0.000481 0.76 AML other m 2021-09-20T21:31:31.47
IV.STAL.HHN. ML:1.4 0.00032199999999999997 0.18 AML other m 2021-09-20T21:31:31.51
IV.STAL.HNE. ML:1.6 0.000411 1.38 AML other m 2021-09-20T21:31:31.17
OX.MLN.HHE. ML:1.0 0.000125 1.1 AML other m 2021-09-20T21:31:32.76
IV.STAL.HHE. ML:1.6 0.0004335 0.76 AML other m 2021-09-20T21:31:32.21
OX.MLN.HHN. ML:1.0 0.00009814999999999999 0.32 AML other m 2021-09-20T21:31:33.15
OX.MPRI.HHE. ML:1.3 0.0001545 0.34 AML other m 2021-09-20T21:31:35.07
OX.MPRI.HNE. ML:1.2 0.0001185 0.34 AML other m 2021-09-20T21:31:35.24
OX.CIMO.HNN. ML:1.2 0.0000727 0.1 AML other m 2021-09-20T21:31:35.87
OX.CIMO.HHE. ML:1.0 0.00005715 0.1 AML other m 2021-09-20T21:31:35.92
OX.CIMO.HHN. ML:1.2 0.0000761 0.12 AML other m 2021-09-20T21:31:35.86
OX.CIMO.HNE. ML:1.1 0.00006675000000000001 0.8 AML other m 2021-09-20T21:31:36.83
OX.MPRI.HHN. ML:1.6 0.00028349999999999995 0.34 AML other m 2021-09-20T21:31:38.70
OX.MPRI.HNN. ML:1.5 0.000227 0.36 AML other m 2021-09-20T21:31:38.69
RF.GEPF.HHE. ML:1.1 0.0000526 0.28 AML other m 2021-09-20T21:31:39.71
RF.GEPF.HHN. ML:1.1 0.000054449999999999995 0.28 AML other m 2021-09-20T21:31:39.74
OX.CAE.HHE. ML:1.4 0.0001305 0.42 AML other m 2021-09-20T21:31:40.24
OX.CAE.HHN. ML:1.1 0.00005605 0.52 AML other m 2021-09-20T21:31:40.99
IV.FVI.HHN. ML:0.7 0.000015254999999999999 1.22 AML other m 2021-09-20T21:31:44.10
IV.FVI.HHE. ML:0.8 0.000019450000000000002 0.48 AML other m 2021-09-20T21:31:44.38
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