Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 16-04-2021 and time 10:55:48 (UTC) in region 4 km N Nus (AO)

A magnitude ML 1.5 earthquake occured in region: 4 km N Nus (AO), on

  • 16-04-2021 10:55:48 (UTC)
  • 16-04-2021 12:55:48 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 45.7760, 7.4800 at 10 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
Nus AO 4 2984 2984
Verrayes AO 4 1302 4286
Fénis AO 5 1813 6099
Saint-Marcel AO 5 1362 7461
Quart AO 6 4039 11500
Chambave AO 7 931 12431
Saint-Denis AO 7 378 12809
Torgnon AO 8 558 13367
Brissogne AO 8 1008 14375
Antey-Saint-André AO 10 602 14977
Pontey AO 10 817 15794
Saint-Christophe AO 10 3432 19226
Pollein AO 11 1569 20795
Châtillon AO 11 4772 25567
Oyace AO 11 219 25786
La Magdeleine AO 12 109 25895
Bionaz AO 12 236 26131
Aosta AO 13 34390 60521
Valpelline AO 13 657 61178
Chamois AO 13 97 61275
Roisan AO 13 1036 62311
Saint-Vincent AO 13 4660 66971
Charvensod AO 13 2468 69439
Gignod AO 14 1710 71149
Doues AO 14 510 71659
Ollomont AO 15 157 71816
Valtournenche AO 16 2277 74093
Gressan AO 16 3387 77480
Allein AO 17 229 77709
Ayas AO 17 1401 79110
Champdepraz AO 17 712 79822
Montjovet AO 17 1801 81623
Jovençan AO 17 736 82359
Emarèse AO 18 226 82585
Sarre AO 18 4927 87512
Etroubles AO 20 501 88013
Brusson AO 20 897 88910

Municipalities with at least 50000 inhabitants

An earthquake occurred to
80 Km N of Torino (890529 inhabitants)
88 Km N of Moncalieri (57294 inhabitants)
96 Km W of Novara (104380 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 1.5 2021-04-16
10:55:48		 45.776 7.4802 11 2021-07-12
16:55:07		 Bollettino Sismico Italiano INGV 89354981
Reviewed
Rev100 		ML 1.5 2021-04-16
10:55:48		 45.7803 7.4787 7 2021-04-16
11:05:17		 Sala Sismica INGV-Roma 89143211
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-16 10:55:48 ± 0.18
Latitude 45.7760 ± 0.0063
Longitude 7.4802 ± 0.0103
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 89354981

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 708
Semi-minor axis of confidence ellipse (meter) 567
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 239
Circular confidence region, given by single value of horizontal uncertainty (meter) 710.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 63
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.36
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.13135
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 89354981
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-04-22 11:23:21

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 89143211
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-16 11:05:17
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
ST.OZOL.EHZ. 2021-04-16T10:56:31.23 3.0 positive manual Pn -2.36 0
IV.CADC.EHZ. 2021-04-16T10:56:28.28 3.0 undecidable manual Pg 4 0
GU.RRL.HHE. 2021-04-16T10:56:20.68 0.6 undecidable manual S 210 109.0131 50 0.3 40
GU.BHB.HHZ. 2021-04-16T10:56:19.37 0.3 undecidable manual S 189 105.7164 50 -0.12 63
MN.BNI.HHZ. 2021-04-16T10:56:18.45 0.3 undecidable manual S 218 101.7204 50 0.01 65
CH.GIMEL.HHE. 2021-04-16T10:56:10.03 0.3 undecidable manual P 312 125.5743 50 0.49 56
CH.MUGIO.HHZ. 2021-04-16T10:56:09.16 0.3 undecidable manual P 82 121.6893 50 0.21 59
CH.FUSIO.HHE. 2021-04-16T10:56:08.94 0.1 undecidable manual P 50 118.0929 50 0.56 74
GU.RRL.HHE. 2021-04-16T10:56:07.37 0.1 undecidable manual P 210 109.0131 50 0.38 79
GU.BHB.HHZ. 2021-04-16T10:56:06.84 0.3 undecidable manual P 189 105.7164 50 0.37 60
MN.BNI.HHZ. 2021-04-16T10:56:06.45 0.1 undecidable manual P 218 101.7204 50 0.58 75
GU.BLANC.HHE. 2021-04-16T10:56:02.51 0.1 undecidable manual S 280 42.9237 50 -0.22 92
GU.RSP.HHE. 2021-04-16T10:56:01.44 0.1 undecidable manual P 194 71.5728 50 0.22 88
GU.TRAV.HHE. 2021-04-16T10:56:00.07 0.3 undecidable manual S 145 35.8419 50 -0.76 59
IV.MRGE.HHZ. 2021-04-16T10:55:59.20 0.3 undecidable manual S 269 32.4453 50 -0.74 60
CH.DIX.HHZ. 2021-04-16T10:55:59.87 0.1 undecidable manual S 351 34.1436 50 -0.53 87
GU.BLANC.HHE. 2021-04-16T10:55:57.02 0.1 undecidable manual P 280 42.9237 50 0.22 92
CH.MMK.HHE. 2021-04-16T10:55:57.61 0.1 positive manual P 51 48.2184 50 0 96
GU.CIRO.HHZ. 2021-04-16T10:55:55.88 0.3 undecidable manual S 161 20.4684 117 -0.8 60
GU.TRAV.HHE. 2021-04-16T10:55:55.74 0.1 undecidable manual P 145 35.8419 50 0.04 97
IV.MRGE.HHZ. 2021-04-16T10:55:55.12 0.1 undecidable manual P 269 32.4453 50 -0.06 97
CH.DIX.HHZ. 2021-04-16T10:55:55.32 0.1 positive manual P 351 34.1436 50 -0.13 95
GU.CIRO.HHZ. 2021-04-16T10:55:53.28 0.1 undecidable manual P 161 20.4684 117 -0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
CH.DIX.HHN. ML:2.0 0.00044803709999999996 0.16 AML other m 2021-04-16T10:55:55.39
GU.CIRO.HHN. ML:1.7 0.0003549860500000001 0.0768 AML other m 2021-04-16T10:55:56.40
GU.CIRO.HHE. ML:1.7 0.00038883875 0.1216 AML other m 2021-04-16T10:55:56.46
IV.MRGE.HHN. ML:1.2 0.0000747 0.16 AML other m 2021-04-16T10:55:59.43
IV.MRGE.HHE. ML:1.1 0.000060450000000000006 0.26 AML other m 2021-04-16T10:56:00.20
CH.DIX.HHE. ML:1.8 0.0002799796 0.0704 AML other m 2021-04-16T10:56:00.92
MN.BNI.HNN. ML:1.6 0.00003413357 0.9792 AML other m 2021-04-16T10:56:17.18
MN.BNI.HHN. ML:1.0 0.000011195713499999999 0.2752 AML other m 2021-04-16T10:56:20.47
MN.BNI.HNE. ML:1.5 0.00003231901 0.816 AML other m 2021-04-16T10:56:39.54
MN.BNI.HHE. ML:1.0 0.000011745195 0.5408 AML other m 2021-04-16T10:56:39.55
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