Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.5 on date 28-03-2020 and time 17:41:21 (Italy) in region 5 km N Ollomont (AO)

A magnitude ML 0.5 earthquake occured in region: 5 km N Ollomont (AO), on

  • 28-03-2020 16:41:21 (UTC)
  • 28-03-2020 17:41:21 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 45.8940, 7.3280 at 6 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
Ollomont AO 5 157 157
Oyace AO 6 219 376
Valpelline AO 8 657 1033
Bionaz AO 8 236 1269
Doues AO 8 510 1779
Allein AO 10 229 2008
Etroubles AO 11 501 2509
Saint-Oyen AO 12 203 2712
Roisan AO 12 1036 3748
Gignod AO 13 1710 5458
Saint-Rhémy-en-Bosses AO 14 338 5796
Saint-Christophe AO 16 3432 9228
Aosta AO 17 34390 43618
Quart AO 18 4039 47657
Pollein AO 19 1569 49226
Gressan AO 19 3387 52613
Charvensod AO 19 2468 55081
Brissogne AO 20 1008 56089

Municipalities with at least 50000 inhabitants

An earthquake occurred to
95 Km NW of Torino (890529 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
Reviewed
Rev100 		ML 0.5 2020-03-28
16:41:21		 45.8945 7.3277 6 2020-03-28
16:52:36		 Sala Sismica INGV-Roma 77650511
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-03-28 16:41:21 ± 0.15
Latitude 45.8945 ± 0.0081
Longitude 7.3277 ± 0.0103
Depth (km) 6 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 77650511

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 828
Semi-minor axis of confidence ellipse (meter) 554
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 149
Circular confidence region, given by single value of horizontal uncertainty (meter) 830.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 141
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0.19335
Epicentral distance of station farthest from the epicenter (degree) 0.48114
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.5

Field Value
Value 0.5
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 77650511
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-03-28 16:52:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.TRAV.HHZ. 2020-03-28T16:41:39.19 0.6 undecidable manual S 142 53.4021 50 -0.26 47
CH.MMK.HHZ. 2020-03-28T16:41:38.72 0.6 undecidable manual S 70 52.0035 50 -0.37 46
GU.SATI.HHZ. 2020-03-28T16:41:35.57 0.3 undecidable manual S 93 41.8248 -0.69 63
GU.CIRO.HHZ. 2020-03-28T16:41:34.82 0.6 undecidable manual S 150 37.4292 0.07 50
GU.TRAV.HHZ. 2020-03-28T16:41:32.25 0.6 positive manual P 142 53.4021 50 0.34 46
CH.MMK.HHZ. 2020-03-28T16:41:31.82 0.1 undecidable manual P 70 52.0035 50 0.12 96
GU.LSD.HHZ. 2020-03-28T16:41:31.48 0.1 undecidable manual P 197 50.5161 50 0.01 98
GU.SATI.HHZ. 2020-03-28T16:41:30.50 0.6 undecidable manual P 93 41.8248 0.44 46
IV.MRGE.HHZ. 2020-03-28T16:41:29.80 0.3 undecidable manual S 236 24.8529 -0.66 66
GU.CIRO.HHZ. 2020-03-28T16:41:29.74 0.3 undecidable manual P 150 37.4292 0.55 67
CH.DIX.HHZ. 2020-03-28T16:41:29.16 0.6 undecidable manual S 17 21.4674 105 -0.18 50
CH.DIX.HHZ. 2020-03-28T16:41:26.50 0.6 positive manual P 17 21.4674 105 0.43 47
IV.MRGE.HHZ. 2020-03-28T16:41:26.87 0.1 positive manual P 236 24.8529 0.16 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MRGE.HHE. ML:0.5 0.00002040397 0.0768 AML other m 2020-03-28T16:41:30.75
IV.MRGE.HHN. ML:0.7 0.000027853240000000002 0.064 AML other m 2020-03-28T16:41:30.78
GU.CIRO.HHE. ML:0.1 0.000004993765 0.4352 AML other m 2020-03-28T16:41:34.85
GU.CIRO.HHN. ML:0.1 0.00000340613505 45.9648 AML other m 2020-03-28T16:41:29.63
GU.TRAV.HHE. ML:0.6 0.0000080843615 0.1408 AML other m 2020-03-28T16:41:39.97
GU.TRAV.HHN. ML:0.6 0.000010158266499999999 0.1024 AML other m 2020-03-28T16:41:39.96
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