Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 21-03-2023 and time 09:59:32 (UTC) in region 3 km SW Champdepraz (AO)

A magnitude ML 1.0 earthquake occured in region: 3 km SW Champdepraz (AO), on

  • 21-03-2023 09:59:32 (UTC)
  • 21-03-2023 10:59:32 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 45.6620, 7.6370 at 10 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
Champdepraz AO 3 712 712
Issogne AO 4 1400 2112
Verrès AO 4 2696 4808
Champorcher AO 4 388 5196
Montjovet AO 6 1801 6997
Challand-Saint-Victor AO 6 564 7561
Arnad AO 7 1273 8834
Pontboset AO 7 185 9019
Emarèse AO 9 226 9245
Pontey AO 9 817 10062
Hône AO 10 1166 11228
Saint-Vincent AO 10 4660 15888
Challand-Saint-Anselme AO 10 751 16639
Châtillon AO 10 4772 21411
Bard AO 10 119 21530
Chambave AO 11 931 22461
Saint-Denis AO 12 378 22839
Donnas AO 12 2563 25402
Brusson AO 13 897 26299
Fénis AO 14 1813 28112
Verrayes AO 14 1302 29414
Pont-Saint-Martin AO 14 3840 33254
Perloz AO 14 477 33731
Nus AO 16 2984 36715
Carema TO 16 774 37489
Antey-Saint-André AO 16 602 38091
Torgnon AO 16 558 38649
Lillianes AO 17 462 39111
Saint-Marcel AO 17 1362 40473
La Magdeleine AO 17 109 40582
Valprato Soana TO 17 108 40690
Issime AO 17 423 41113
Quincinetto TO 17 1031 42144
Fontainemore AO 18 440 42584
Ayas AO 18 1401 43985
Traversella TO 19 343 44328
Quart AO 19 4039 48367
Ronco Canavese TO 19 314 48681
Brissogne AO 19 1008 49689
Tavagnasco TO 20 791 50480
Settimo Vittone TO 20 1560 52040
Gressoney-Saint-Jean AO 20 807 52847
Chamois AO 20 97 52944

Municipalities with at least 50000 inhabitants

An earthquake occurred to
65 Km N of Torino (890529 inhabitants)
74 Km N of Moncalieri (57294 inhabitants)
80 Km W of Novara (104380 inhabitants)
90 Km W of Gallarate (53343 inhabitants)
94 Km W of Varese (80799 inhabitants)
95 Km W of Busto Arsizio (83106 inhabitants)
96 Km NW of Asti (76202 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.0 2023-03-21
09:59:32		 45.6618 7.6372 10 2023-03-21
10:09:25		 Sala Sismica INGV-Roma 115589251
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-03-21 09:59:32 ± 0.18
Latitude 45.6618 ± 0.0117
Longitude 7.6372 ± 0.0167
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 115589251

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1338
Semi-minor axis of confidence ellipse (meter) 1218
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 145
Circular confidence region, given by single value of horizontal uncertainty (meter) 1340.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 123
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 11
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) 0.44966
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 115589251
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-03-21 10:09:25
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
OX.SABO.HNZ. 2023-03-21T10:01:27.62 3.0 undecidable manual Sn -0.49 0
IV.MCRV.HHZ. 2023-03-21T10:01:25.12 3.0 undecidable manual Pn 4.32 0
OX.SABO.HNZ. 2023-03-21T10:00:54.54 3.0 undecidable manual Pg 16.98 0
SL.LJU.BHZ. 2023-03-21T10:00:45.72 3.0 positive manual Pn -0.44 0
IV.ARVD.HHZ. 2023-03-21T10:00:43.20 3.0 positive manual Pn 3.46 0
IV.CING.HHZ. 2023-03-21T10:00:39.68 3.0 positive manual Pn -3.11 0
IV.FRON.EHZ. 2023-03-21T10:00:37.50 3.0 positive manual Pn -0.26 0
IV.BAG8.HNZ. 2023-03-21T10:00:34.73 3.0 undecidable manual Sg 0.84 0
IV.ARCI.HHZ. 2023-03-21T10:00:30.48 3.0 negative manual Pn -3.31 0
GU.IMI.HHZ. 2023-03-21T10:00:27.69 3.0 undecidable manual Sg -0.04 0
IV.CTI.HHZ. 2023-03-21T10:00:15.85 3.0 positive manual Pn -2.81 0
IV.SARZ.HNZ. 2023-03-21T10:00:14.37 3.0 undecidable manual S -0.25 0
IV.QLNO.HHZ. 2023-03-21T09:59:57.83 3.0 positive manual P -1.38 0
CH.DIX.HHZ. 2023-03-21T09:59:48.13 0.6 undecidable manual S 339 0.4470 50 -0.59 43
IV.MRGE.HHZ. 2023-03-21T09:59:47.82 0.6 undecidable manual S 285 0.4164 50 0.02 50
GU.LSD.HHZ. 2023-03-21T09:59:47.06 0.3 undecidable manual S 240 0.4065 50 -0.44 69
IV.MRGE.HHZ. 2023-03-21T09:59:42.35 0.6 negative manual P 285 0.4164 50 0.88 39
CH.MMK.HHE. 2023-03-21T09:59:42.03 0.6 undecidable manual P 30 0.4497 50 -0.02 50
GU.LSD.HHZ. 2023-03-21T09:59:41.78 0.3 undecidable manual P 240 0.4065 50 0.48 68
CH.DIX.HHZ. 2023-03-21T09:59:41.92 0.3 undecidable manual P 339 0.4470 50 -0.08 74
GU.TRAV.HHZ. 2023-03-21T09:59:39.88 0.3 undecidable manual S 153 0.1682 119 -0.34 74
GU.CIRO.HHZ. 2023-03-21T09:59:37.27 0.3 undecidable manual S 219 0.0773 140 -0.2 77
GU.TRAV.HHZ. 2023-03-21T09:59:37.36 0.1 positive manual P 153 0.1682 119 0.26 100
GU.CIRO.HHZ. 2023-03-21T09:59:35.86 1.0 undecidable manual P 219 0.0773 140 0.35 25
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.CIRO.HHN. ML:0.8 0.0000872 0.16 AML other m 2023-03-21T09:59:37.49
GU.CIRO.HHE. ML:0.9 0.00010059999999999999 0.22 AML other m 2023-03-21T09:59:37.81
GU.TRAV.HHN. ML:1.2 0.00011865000000000001 0.26 AML other m 2023-03-21T09:59:40.24
GU.TRAV.HHE. ML:1.1 0.0000894 1.5 AML other m 2023-03-21T09:59:40.12
GU.LSD.HHE. ML:0.9 0.000026969970000000002 0.1792 AML other m 2023-03-21T09:59:48.77
GU.LSD.HHN. ML:1.0 0.000029382780000000005 0.1408 AML other m 2023-03-21T09:59:48.05
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, /tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download