Earthquake with magnitude of ML 0.4 on date 22-08-2021 and time 02:09:00 (Italy) in region 5 km S Preone (UD)

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

  • 22-08-2021 00:09:00 (UTC)
  • 22-08-2021 02:09:00 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 46.348, 12.873 at 8 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
Preone UD 5 246 246
Enemonzo UD 7 1319 1565
Socchieve UD 7 908 2473
Tramonti di Sopra PN 8 321 2794
Villa Santina UD 9 2233 5027
Tramonti di Sotto PN 9 387 5414
Raveo UD 10 458 5872
Lauco UD 10 729 6601
Ampezzo UD 10 1006 7607
Verzegnis UD 10 863 8470
Tolmezzo UD 13 10440 18910
Cavazzo Carnico UD 13 1052 19962
Clauzetto PN 14 380 20342
Vito d'Asio PN 14 769 21111
Ovaro UD 15 1922 23033
Forgaria nel Friuli UD 16 1786 24819
Meduno PN 16 1574 26393
Forni di Sotto UD 16 600 26993
Castelnovo del Friuli PN 17 880 27873
Travesio PN 17 1776 29649
Trasaghis UD 17 2227 31876
Zuglio UD 17 595 32471
Amaro UD 17 823 33294
Arta Terme UD 18 2171 35465
Bordano UD 18 754 36219
Sauris UD 18 416 36635
Comeglians UD 19 516 37151
Cavasso Nuovo PN 19 1525 38676
Frisanco PN 19 622 39298
Osoppo UD 19 2936 42234
Pinzano al Tagliamento PN 19 1525 43759
Fanna PN 20 1583 45342
Prato Carnico UD 20 904 46246

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km NW of Udine (99169 inhabitants)
47 Km NE of Pordenone (51229 inhabitants)
90 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 2021-08-22
00:09:00
46.3483 12.8732 8 2021-08-22
00:32:51
Sala Sismica INGV-Roma 94479011
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-22 00:09:00 ± 0.24
Latitude 46.3483 ± 0.0045
Longitude 12.8732 ± 0.0078
Depth (km) 8 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94479011

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 589
Semi-minor axis of confidence ellipse (meter) 144
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 298
Circular confidence region, given by single value of horizontal uncertainty (meter) 590
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 114
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.10882
Epicentral distance of station farthest from the epicenter (degree) 0.27609
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 94479011
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-22 00:32:51
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
OX.MLN.HNZ. 2021-08-22T00:09:11.04 0.6 undecidable manual S 222 0.2671 105 -0.01 49
OX.PLRO.HHZ. 2021-08-22T00:09:11.23 0.3 undecidable manual S 43 0.2761 105 -0.15 71
IV.FVI.HHZ. 2021-08-22T00:09:09.98 0.3 undecidable manual S 346 0.2563 106 -0.67 62
OX.MLN.HNZ. 2021-08-22T00:09:07.31 0.6 undecidable manual P 222 0.2671 105 0.76 40
OX.PLRO.HHZ. 2021-08-22T00:09:07.24 0.3 undecidable manual P 43 0.2761 105 0.5 66
IV.STAL.HHZ. 2021-08-22T00:09:06.45 0.3 undecidable manual S 232 0.143 117 -0.12 74
IV.FVI.HHZ. 2021-08-22T00:09:06.19 0.3 undecidable manual P 346 0.2563 106 -0.12 72
OX.BOO.HNZ. 2021-08-22T00:09:06.65 0.3 undecidable manual S 100 0.1583 115 -0.45 69
OX.MPRI.HHZ. 2021-08-22T00:09:06.27 0.3 undecidable manual S 144 0.1331 119 0.02 75
OX.FUSE.HHZ. 2021-08-22T00:09:05.76 0.3 undecidable manual S 53 0.1097 123 0.29 72
OX.CLUD.HHZ. 2021-08-22T00:09:05.64 0.3 undecidable manual S 3 0.1088 124 0.22 73
OX.BOO.HNZ. 2021-08-22T00:09:04.02 0.3 undecidable manual P 100 0.1583 115 -0.24 72
OX.CLUD.HHZ. 2021-08-22T00:09:03.49 0.3 undecidable manual P 3 0.1088 124 0.19 73
OX.MPRI.HHZ. 2021-08-22T00:09:03.73 0.1 undecidable manual P 144 0.1331 119 -0.05 100
IV.STAL.HHZ. 2021-08-22T00:09:03.83 0.3 undecidable manual P 232 0.143 117 -0.13 74
OX.FUSE.HHZ. 2021-08-22T00:09:03.50 0.1 undecidable manual P 53 0.1097 123 0.17 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
OX.CLUD.HHN. ML:-0.1 8.273410395E-6 0.14 AML other m 2021-08-22T00:09:06.14
OX.CLUD.HHE. ML:-0.4 6.1643035E-6 0.2 AML other m 2021-08-22T00:09:05.74
OX.MPRI.HHE. ML:0.2 1.5803775E-5 0.14 AML other m 2021-08-22T00:09:06.87
IV.STAL.HHE. ML:0.2 1.385E-5 0.58 AML other m 2021-08-22T00:09:06.37
OX.MPRI.HHN. ML:0.5 3.565E-5 0.3 AML other m 2021-08-22T00:09:06.73
IV.STAL.HHN. ML:0.3 2.025E-5 1.2 AML other m 2021-08-22T00:09:07.92
OX.PLRO.HHE. ML:0.3 1.05E-5 0.42 AML other m 2021-08-22T00:09:11.85
OX.PLRO.HHN. ML:0.5 1.637432E-5 1.22 AML other m 2021-08-22T00:09:12.29
OX.CLUD.HNE. ML:0.4 2.865413E-5 1.98 AML other m 2021-08-22T00:09:06.10
OX.CLUD.HNN. ML:0.2 1.84100365E-5 0.68 AML other m 2021-08-22T00:09:05.95
OX.MPRI.HNE. ML:0.5 3.596894E-5 0.64 AML other m 2021-08-22T00:09:06.87
OX.MPRI.HNN. ML:0.6 4.009302E-5 0.9 AML other m 2021-08-22T00:09:07.20
IV.STAL.HNE. ML:0.8 5.484749E-5 0.77 AML other m 2021-08-22T00:09:06.45
IV.STAL.HNN. ML:0.9 8.5918195E-5 1.05 AML other m 2021-08-22T00:09:07.01
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