Earthquake with magnitude of ML 1.1 on date 04-12-2021 and time 00:35:51 (UTC) in region Confine Italia Svizzera (SVIZZERA)

A magnitude ML 1.1 earthquake occured in region: Confine Italia Svizzera (SVIZZERA), on

  • 04-12-2021 00:35:51 (UTC)
  • 04-12-2021 01:35:51 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 46.272, 8.082 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
Trasquera VB 12 194 194
Varzo VB 15 2046 2240
Baceno VB 18 918 3158
Bognanco VB 19 219 3377
Crodo VB 19 1404 4781
Premia VB 20 564 5345

Municipalities with at least 50000 inhabitants

An earthquake occurred to
76 Km NW of Varese (80799 inhabitants)
87 Km NW of Gallarate (53343 inhabitants)
93 Km NW of Como (84495 inhabitants)
94 Km NW of Busto Arsizio (83106 inhabitants)
99 Km NW of Legnano (60262 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 earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.1 2021-12-04
00:35:51
46.2717 8.0822 8 2021-12-04
00:46:11
Sala Sismica INGV-Roma 98107501
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-04 00:35:51 ± 0.17
Latitude 46.2717 ± 0.0072
Longitude 8.0822 ± 0.0065
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 98107501

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 748
Semi-minor axis of confidence ellipse (meter) 520
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 163
Circular confidence region, given by single value of horizontal uncertainty (meter) 750
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 133
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.86785
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 98107501
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-04 00:46:11
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.IMI.HHZ. 2021-12-04T00:36:36.52 3.0 undecidable manual Pg 4.22 0
IV.VOBA.EHZ. 2021-12-04T00:36:26.10 3.0 positive manual Pn 0.16 0
IV.SARZ.HHZ. 2021-12-04T00:36:22.99 3.0 negative manual P 1.86 0
GU.TRAV.HHZ. 2021-12-04T00:36:18.11 1.0 undecidable manual S 197 0.7941 50 -0.19 44
CH.MUGIO.HHZ. 2021-12-04T00:36:16.79 1.0 undecidable manual S 117 0.7509 50 -0.24 44
CH.DIX.HHZ. 2021-12-04T00:36:09.67 0.6 undecidable manual S 248 0.5045 50 -0.04 96
IV.MRGE.HHZ. 2021-12-04T00:36:08.49 1.0 undecidable manual P 235 0.8678 50 0.16 43
CH.FUSIO.HHZ. 2021-12-04T00:36:07.61 0.6 undecidable manual S 65 0.4407 50 -0.22 94
GU.TRAV.HHZ. 2021-12-04T00:36:07.08 1.0 undecidable manual P 197 0.7941 50 0.02 45
CH.MUGIO.HHZ. 2021-12-04T00:36:06.69 0.6 undecidable manual P 117 0.7509 50 0.36 85
GU.CIRO.HHE. 2021-12-04T00:36:06.51 1.0 undecidable manual P 208 0.759 50 0.06 45
IV.VARE.HHE. 2021-12-04T00:36:04.43 0.6 undecidable manual P 130 0.625 50 0.27 90
CH.BNALP.HHE. 2021-12-04T00:36:04.27 1.0 undecidable manual P 21 0.643 50 -0.21 45
CH.DIX.HHZ. 2021-12-04T00:36:02.19 0.6 negative manual P 248 0.5045 50 0.09 95
CH.FUSIO.HHZ. 2021-12-04T00:36:00.90 1.0 undecidable manual P 65 0.4407 50 -0.11 48
CH.MMK.HHZ. 2021-12-04T00:36:00.62 1.0 undecidable manual S 200 0.2356 108 -0.6 44
CH.MMK.HHZ. 2021-12-04T00:35:57.31 0.6 positive manual P 200 0.2356 108 0.11 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
CH.MMK.HHE. ML:0 1.5874935E-5 0.14 AML other m 2021-12-04T00:36:00.60
CH.MMK.HHN. ML:0 1.908518E-5 0.14 AML other m 2021-12-04T00:36:01.44
IV.VOBA.EHE. ML:2.4 7.598161E-5 0.14 AML other m 2021-12-04T00:36:38.79
IV.VOBA.EHN. ML:2.5 9.473834E-5 0.16 AML other m 2021-12-04T00:36:38.78
CH.FUSIO.HHE. ML:0.6 1.2261599E-5 0.11 AML other m 2021-12-04T00:36:08.10
CH.FUSIO.HHN. ML:0.7 1.4753857E-5 0.12 AML other m 2021-12-04T00:36:08.73
CH.DIX.HHE. ML:1.3 4.3863945E-5 0.32 AML other m 2021-12-04T00:36:10.78
CH.DIX.HHN. ML:1.4 5.311451E-5 0.21 AML other m 2021-12-04T00:36:10.38
CH.MUGIO.HHE. ML:0.9 1.05972725E-5 0.26 AML other m 2021-12-04T00:36:18.37
CH.MUGIO.HHN. ML:0.9 1.1820496E-5 0.17 AML other m 2021-12-04T00:36:17.49
GU.TRAV.HHE. ML:1.2 1.9393505E-5 0.12 AML other m 2021-12-04T00:36:20.75
GU.TRAV.HHN. ML:1.3 2.5726875E-5 0.22 AML other m 2021-12-04T00:36:23.05
IV.MRGE.HHE. ML:1.3 1.8852969E-5 1.58 AML other m 2021-12-04T00:36:42.94
IV.MRGE.HHN. ML:1.4 2.3335076E-5 0.98 AML other m 2021-12-04T00:36:16.30
IV.SARZ.HNE. ML:2.6 0.00017995885 1.06 AML other m 2021-12-04T00:36:55.82
IV.SARZ.HNN. ML:2.6 0.000147406795 0.5 AML other m 2021-12-04T00:36:45.64
IV.SARZ.HHE. ML:2.3 8.4060055E-5 2.12 AML other m 2021-12-04T00:36:51.00
IV.SARZ.HHN. ML:2.2 6.863177E-5 1.06 AML other m 2021-12-04T00:36:59.82
IV.VOBA.HNE. ML:2.8 0.00019017245 0.15 AML other m 2021-12-04T00:36:38.86
IV.VOBA.HNN. ML:2.8 0.000180713015 0.35 AML other m 2021-12-04T00:36:46.16
GU.IMI.HHE. ML:2.3 3.68045E-5 0.9 AML other m 2021-12-04T00:37:37.39
GU.IMI.HHN. ML:2.4 4.425891E-5 1.12 AML other m 2021-12-04T00:37:38.66
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