Earthquake with magnitude of ML 0.4 on date 31-08-2021 and time 23:57:47 (Italy) in region 5 km S Villa Santina (UD)

A magnitude ML 0.4 earthquake occured in region: 5 km S Villa Santina (UD), on

  • 31-08-2021 21:57:47 (UTC)
  • 31-08-2021 23:57:47 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 46.372, 12.935 at 4 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Villa Santina UD 5 2233 2233
Verzegnis UD 5 863 3096
Preone UD 6 246 3342
Lauco UD 6 729 4071
Enemonzo UD 6 1319 5390
Tolmezzo UD 7 10440 15830
Cavazzo Carnico UD 8 1052 16882
Raveo UD 9 458 17340
Socchieve UD 9 908 18248
Ampezzo UD 12 1006 19254
Zuglio UD 12 595 19849
Amaro UD 12 823 20672
Tramonti di Sopra PN 13 321 20993
Arta Terme UD 13 2171 23164
Ovaro UD 14 1922 25086
Tramonti di Sotto PN 14 387 25473
Bordano UD 15 754 26227
Trasaghis UD 15 2227 28454
Vito d'Asio PN 16 769 29223
Clauzetto PN 16 380 29603
Sutrio UD 16 1332 30935
Venzone UD 16 2117 33052
Forgaria nel Friuli UD 17 1786 34838
Comeglians UD 17 516 35354
Osoppo UD 17 2936 38290
Ravascletto UD 17 536 38826
Cercivento UD 18 679 39505
Paluzza UD 19 2217 41722
Gemona del Friuli UD 19 10964 52686
Castelnovo del Friuli PN 19 880 53566
Prato Carnico UD 20 904 54470
Treppo Carnico UD 20 618 55088
Travesio PN 20 1776 56864

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km NW of Udine (99169 inhabitants)
51 Km NE of Pordenone (51229 inhabitants)
95 Km NE of Treviso (83731 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 0.4 2021-08-31
21:57:47
46.3723 12.9353 4 2021-08-31
22:04:30
Sala Sismica INGV-Roma 94887941
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-31 21:57:47 ± 0.12
Latitude 46.3723 ± 0.0027
Longitude 12.9353 ± 0.0039
Depth (km) 4 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94887941

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 310
Semi-minor axis of confidence ellipse (meter) 103
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 271
Circular confidence region, given by single value of horizontal uncertainty (meter) 310
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 18
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.22933
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 9
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 94887941
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-31 22:04:30
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
OX.PLRO.HHE. 2021-08-31T21:57:55.80 0.3 undecidable manual S 40 0.2293 99 -0.19 70
IV.STAL.HHZ. 2021-08-31T21:57:54.25 0.3 undecidable manual S 234 0.1916 100 -0.3 69
RF.GEPF.HHZ. 2021-08-31T21:57:54.07 0.3 undecidable manual S 125 0.1709 102 0.31 70
OX.PLRO.HHE. 2021-08-31T21:57:52.35 0.3 undecidable manual P 40 0.2293 99 0.14 71
NI.PALA.HHZ. 2021-08-31T21:57:52.30 0.1 undecidable manual S 184 0.1277 106 0.15 97
OX.MPRI.HHZ. 2021-08-31T21:57:52.55 0.1 undecidable manual S 165 0.1367 105 0.08 98
IV.FVI.HHZ. 2021-08-31T21:57:52.22 3.0 undecidable manual P -0.07 0
RF.GEPF.HHZ. 2021-08-31T21:57:51.00 0.3 undecidable manual P 125 0.1709 102 0.08 73
IV.STAL.HHZ. 2021-08-31T21:57:51.05 0.3 undecidable manual P 234 0.1916 100 -0.33 69
OX.BOO.HHE. 2021-08-31T21:57:51.79 0.3 undecidable manual S 115 0.1241 106 -0.24 71
OX.CLUD.HHZ. 2021-08-31T21:57:50.89 0.1 undecidable manual S 336 0.0926 111 0.03 100
NI.PURA.HHE. 2021-08-31T21:57:50.65 0.1 undecidable manual P 292 0.1439 104 0.31 93
NI.PALA.HHZ. 2021-08-31T21:57:50.02 0.1 negative manual P 184 0.1277 106 0.03 99
OX.MPRI.HHZ. 2021-08-31T21:57:50.08 0.1 undecidable manual P 165 0.1367 105 -0.1 97
OX.BOO.HHE. 2021-08-31T21:57:49.75 0.1 undecidable manual P 115 0.1241 106 -0.17 96
OX.CLUD.HHZ. 2021-08-31T21:57:49.26 0.1 negative manual P 336 0.0926 111 0.01 100
OX.FUSE.HHZ. 2021-08-31T21:57:49.70 0.1 undecidable manual S 47 0.0621 120 -0.09 99
OX.FUSE.HHZ. 2021-08-31T21:57:48.72 0.1 positive manual P 47 0.0621 120 0.09 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
OX.CLUD.HHE. ML:0.4 4.015E-5 0.7 AML other m 2021-08-31T21:57:51.30
OX.CLUD.HHN. ML:0.2 3.08E-5 0.16 AML other m 2021-08-31T21:57:51.82
NI.PALA.HHN. ML:0.7 5.415E-5 0.4 AML other m 2021-08-31T21:57:52.89
NI.PALA.HHE. ML:0.6 4.6E-5 1.28 AML other m 2021-08-31T21:57:53.75
IV.STAL.HHN. ML:0.4 1.945E-5 0.22 AML other m 2021-08-31T21:57:54.20
IV.STAL.HHE. ML:0.4 2.05E-5 0.22 AML other m 2021-08-31T21:57:55.08
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