Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 27-01-2021 and time 13:59:18 (Italy) in region Confine Italia Slovenia (SLOVENIA)

A magnitude ML 1.5 earthquake occured in region: Confine Italia Slovenia (SLOVENIA), on

  • 27-01-2021 12:59:18 (UTC)
  • 27-01-2021 13:59:18 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 46.04, 13.73 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.

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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
San Floriano del Collio GO 13 796 796
Gorizia GO 14 34844 35640
Stregna UD 15 356 35996
Grimacco UD 16 342 36338
Drenchia UD 17 115 36453
San Leonardo UD 18 1129 37582
Mossa GO 18 1584 39166
Prepotto UD 19 769 39935
Dolegna del Collio GO 19 370 40305
San Lorenzo Isontino GO 20 1564 41869
Savogna UD 20 411 42280
Savogna d'Isonzo GO 20 1717 43997
Capriva del Friuli GO 20 1713 45710

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km E of Udine (99169 inhabitants)
44 Km N of Trieste (204420 inhabitants)
83 Km E of Pordenone (51229 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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 1.5 2021-01-27
12:59:18		 46.04 13.73 8 2021-01-27
13:27:12		 Sala Sismica INGV-Roma 86631751
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-27 12:59:18 ± 0.36
Latitude 46.04 ± 0.01
Longitude 13.73 ± 0.03
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86631751

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2366
Semi-minor axis of confidence ellipse (meter) 797
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 100
Circular confidence region, given by single value of horizontal uncertainty (meter) 2370
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 253
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.08633
Epicentral distance of station farthest from the epicenter (degree) 0.44516
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.4
Num. used stations 5
Type of magnitude ML
Reference to an origin 86631751
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-27 13:27:12
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.PTCC.HHE. 2021-01-27T12:59:34.75 0.6 undecidable manual S 325 0.4452 50 0 47
OX.BAD.HHE. 2021-01-27T12:59:33.46 0.6 undecidable manual S 300 0.3849 50 0.5 43
NI.VINO.HHZ. 2021-01-27T12:59:32.31 0.6 undecidable manual S 304 0.3759 50 -0.4 44
IV.PTCC.HHE. 2021-01-27T12:59:28.15 0.3 undecidable manual P 325 0.4452 50 0.3 66
NI.VINO.HHZ. 2021-01-27T12:59:26.22 0.3 undecidable manual P 304 0.3759 50 -0.45 65
OX.BAD.HHE. 2021-01-27T12:59:26.89 0.6 undecidable manual P 300 0.3849 50 0.08 47
OX.DRE.HHZ. 2021-01-27T12:59:24.54 0.6 undecidable manual S 336 0.1412 117 0.04 50
OX.SABO.HHZ. 2021-01-27T12:59:22.71 0.6 undecidable manual S 229 0.0863 130 -0.03 50
OX.DRE.HHZ. 2021-01-27T12:59:21.87 0.1 undecidable manual P 336 0.1412 117 -0.05 99
OX.SABO.HHZ. 2021-01-27T12:59:20.96 0.1 undecidable manual P 229 0.0863 130 0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
OX.SABO.HHE. ML:1.2 0.0002163509 0.3776 AML other m 2021-01-27T12:59:24.29
OX.SABO.HHN. ML:1.5 0.0004687417 0.5248 AML other m 2021-01-27T12:59:23.43
OX.SABO.HNE. ML:1.8 0.0008619911 0.384 AML other m 2021-01-27T12:59:24.30
OX.SABO.HNN. ML:2.1 0.0018507065 0.5248 AML other m 2021-01-27T12:59:23.43
NI.VINO.HHE. ML:0.9 2.3208154E-5 0.2752 AML other m 2021-01-27T12:59:33.74
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download