Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 12-05-2023 and time 12:17:33 (UTC) in region 2 km W Issime (AO)

A magnitude ML 0.8 earthquake occured in region: 2 km W Issime (AO), on

  • 12-05-2023 12:17:33 (UTC)
  • 12-05-2023 14:17:33 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 45.6830, 7.8280 at 1 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
Issime AO 2 423 423
Fontainemore AO 5 440 863
Gaby AO 6 468 1331
Lillianes AO 6 462 1793
Perloz AO 8 477 2270
Challand-Saint-Anselme AO 8 751 3021
Arnad AO 9 1273 4294
Pont-Saint-Martin AO 9 3840 8134
Challand-Saint-Victor AO 9 564 8698
Donnas AO 10 2563 11261
Piedicavallo BI 10 193 11454
Bard AO 10 119 11573
Hône AO 11 1166 12739
Gressoney-Saint-Jean AO 11 807 13546
Verrès AO 11 2696 16242
Emarèse AO 11 226 16468
Carema TO 11 774 17242
Brusson AO 11 897 18139
Issogne AO 12 1400 19539
Rosazza BI 12 108 19647
Montjovet AO 12 1801 21448
Champdepraz AO 13 712 22160
Campiglia Cervo BI 14 505 22665
Quincinetto TO 14 1031 23696
Pontboset AO 14 185 23881
Settimo Vittone TO 15 1560 25441
Tavagnasco TO 15 791 26232
Saint-Vincent AO 16 4660 30892
Gressoney-La-Trinité AO 16 303 31195
Nomaglio TO 17 287 31482
Sordevolo BI 17 1373 32855
Champorcher AO 17 388 33243
Rassa VC 17 71 33314
Quassolo TO 17 354 33668
Andrate TO 17 505 34173
Pollone BI 17 2109 36282
Ayas AO 18 1401 37683
Graglia BI 18 1559 39242
Sagliano Micca BI 18 1637 40879
Châtillon AO 18 4772 45651
Donato BI 18 693 46344
Muzzano BI 18 609 46953
Miagliano BI 18 624 47577
Netro BI 19 1009 48586
Tavigliano BI 19 942 49528
Borgofranco d'Ivrea TO 19 3732 53260
Occhieppo Superiore BI 19 2776 56036
Andorno Micca BI 19 3274 59310
Pralungo BI 19 2510 61820
Pontey AO 19 817 62637
Riva Valdobbia VC 20 258 62895

Municipalities with at least 50000 inhabitants

An earthquake occurred to
67 Km W of Novara (104380 inhabitants)
69 Km N of Torino (890529 inhabitants)
75 Km W of Gallarate (53343 inhabitants)
77 Km N of Moncalieri (57294 inhabitants)
79 Km W of Varese (80799 inhabitants)
80 Km W of Busto Arsizio (83106 inhabitants)
85 Km W of Legnano (60262 inhabitants)
90 Km W of Vigevano (63310 inhabitants)
92 Km NW of Asti (76202 inhabitants)
96 Km W of Rho (50434 inhabitants)
99 Km W of Como (84495 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 0.8 2023-05-12
12:17:33		 45.6827 7.8283 1 2023-05-12
12:22:26		 Sala Sismica INGV-Roma 117286861
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-05-12 12:17:33 ± 0.13
Latitude 45.6827 ± 0.0054
Longitude 7.8283 ± 0.0129
Depth (km) 1 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 117286861

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1110
Semi-minor axis of confidence ellipse (meter) 370
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 115
Circular confidence region, given by single value of horizontal uncertainty (meter) 1110.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 191
Number of associated phases, regardless of their use for origin computation 6
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.17986
Epicentral distance of station farthest from the epicenter (degree) 0.19875
Number of stations at which the event was observed 3
Number of stations from which data was used for origin computation 3
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 117286861
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-05-12 12:22:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.CIRO.HHZ. 2023-05-12T12:17:41.04 0.6 undecidable manual S 246 22.0668 92 -0.02 51
GU.TRAV.HHZ. 2023-05-12T12:17:40.16 0.6 undecidable manual S 199 19.9689 92 -0.16 50
GU.SATI.HHZ. 2023-05-12T12:17:40.69 0.6 undecidable manual S 8 21.6672 92 -0.2 49
GU.CIRO.HHZ. 2023-05-12T12:17:37.88 0.6 undecidable manual P 246 22.0668 92 0.06 50
GU.TRAV.HHZ. 2023-05-12T12:17:37.60 1.0 undecidable manual P 199 19.9689 92 0.21 24
GU.SATI.HHZ. 2023-05-12T12:17:37.82 0.1 positive manual P 8 21.6672 92 0.1 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.TRAV.HHN. ML:1.4 0.00020305495 0.0832 AML other m 2023-05-12T12:17:40.29
GU.TRAV.HHE. ML:1.2 0.000132 0.26 AML other m 2023-05-12T12:17:40.29
GU.SATI.HHN. ML:0.8 0.0000436 0.22 AML other m 2023-05-12T12:17:41.15
GU.SATI.HHE. ML:0.8 0.000042800000000000004 0.72 AML other m 2023-05-12T12:17:41.78
GU.CIRO.HHE. ML:0.6 0.00002785 0.32 AML other m 2023-05-12T12:17:41.60
GU.CIRO.HHN. ML:0.5 0.0000237 0.32 AML other m 2023-05-12T12:17:41.49
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