Earthquake with magnitude of ML 1.7 on date 01-08-2021 and time 07:37:57 (Italy) in region 8 km SW Macugnaga (VB)

A magnitude ML 1.7 earthquake occured in region: 8 km SW Macugnaga (VB), on

  • 01-08-2021 05:37:57 (UTC)
  • 01-08-2021 07:37:57 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 45.929, 7.883 at 9 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
Macugnaga VB 8 557 557
Alagna Valsesia VC 9 408 965
Riva Valdobbia VC 12 258 1223
Gressoney-La-Trinité AO 12 303 1526
Rima San Giuseppe VC 13 59 1585
Carcoforo VC 13 78 1663
Ceppo Morelli VB 15 321 1984
Rimasco VC 16 106 2090
Mollia VC 17 95 2185
Gressoney-Saint-Jean AO 17 807 2992
Campertogno VC 19 237 3229
Vanzone con San Carlo VB 19 407 3636
Ayas AO 20 1401 5037

Municipalities with at least 50000 inhabitants

An earthquake occurred to
74 Km W of Varese (80799 inhabitants)
77 Km W of Gallarate (53343 inhabitants)
79 Km NW of Novara (104380 inhabitants)
83 Km W of Busto Arsizio (83106 inhabitants)
89 Km W of Legnano (60262 inhabitants)
94 Km W of Como (84495 inhabitants)
96 Km N of Torino (890529 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 the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.7 2021-08-01
05:37:57
45.9288 7.8833 9 2021-08-01
05:45:00
Sala Sismica INGV-Roma 93477751
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-01 05:37:57 ± 0.19
Latitude 45.9288 ± 0.0099
Longitude 7.8833 ± 0.0142
Depth (km) 9 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 93477751

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1139
Semi-minor axis of confidence ellipse (meter) 933
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 122
Circular confidence region, given by single value of horizontal uncertainty (meter) 1140
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 98
Number of associated phases, regardless of their use for origin computation 31
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.37
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 1.01264
Number of stations at which the event was observed 27
Number of stations from which data was used for origin computation 10
Magnitude information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 93477751
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-01 05:45:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MIDA.HHZ. 2021-08-01T05:39:53.80 3.0 undecidable manual Pg 23.74 0
IX.SCL3.EHZ.02 2021-08-01T05:39:51.11 3.0 negative manual Pn 2.58 0
IV.BRSN.EHZ. 2021-08-01T05:39:49.79 3.0 undecidable manual Sg 18.01 0
TV.SF01.EHZ. 2021-08-01T05:39:47.22 3.0 undecidable manual Sn -1.38 0
IV.GIUL.HHZ. 2021-08-01T05:39:38.76 3.0 undecidable manual Pg 14.82 0
SL.LJU.BHZ. 2021-08-01T05:39:30.32 3.0 undecidable manual Pg 23.09 0
IV.MMUR.HNZ. 2021-08-01T05:39:22.61 3.0 undecidable manual Pg 18.42 0
SL.BOJS.BHZ. 2021-08-01T05:39:17.52 3.0 undecidable manual Pn 2.79 0
IV.ARCI.HHZ. 2021-08-01T05:39:12.78 3.0 undecidable manual Pg 14.1 0
IV.APEC.HHZ. 2021-08-01T05:39:05.27 3.0 positive manual Pn 6.66 0
NI.POLC.HHZ. 2021-08-01T05:38:58.34 3.0 undecidable manual Pg 10.53 0
IV.ASQU.HHZ. 2021-08-01T05:38:56.67 3.0 positive manual Pn 5.02 0
IV.FNVD.HHZ. 2021-08-01T05:38:41.75 3.0 undecidable manual Pn -1.56 0
IV.EUCT.HNZ. 2021-08-01T05:38:21.25 3.0 undecidable manual P 2 0
MN.BNI.HHZ. 2021-08-01T05:38:21.04 3.0 negative manual P 0.37 0
GU.BHB.HHZ. 2021-08-01T05:38:18.48 3.0 negative manual P -1.53 0
IV.MILN.HHZ. 2021-08-01T05:38:17.04 3.0 undecidable manual P -0.64 0
CH.BNALP.HHE. 2021-08-01T05:38:16.57 0.6 undecidable manual P 21 1.0126 50 0.47 38
GU.TRAV.HHZ. 2021-08-01T05:38:12.00 0.3 undecidable manual S 193 0.4272 50 -0.64 61
CH.MUGIO.HHZ. 2021-08-01T05:38:12.63 0.3 negative manual P 90 0.8049 50 0.07 66
CH.FUSIO.HHZ. 2021-08-01T05:38:11.82 0.1 negative manual P 45 0.7536 50 0.15 87
GU.CIRO.HHZ. 2021-08-01T05:38:11.18 0.3 undecidable manual S 214 0.3939 50 -0.47 66
GU.LSD.HHZ. 2021-08-01T05:38:11.49 0.6 positive manual P 228 0.7024 50 0.69 38
CH.DIX.HHZ. 2021-08-01T05:38:10.17 0.3 undecidable manual S 295 0.3624 50 -0.56 64
IV.VARE.HHZ. 2021-08-01T05:38:09.19 0.1 positive manual P 95 0.6196 50 -0.19 89
IV.MRGE.HHZ. 2021-08-01T05:38:09.46 0.6 undecidable manual P 255 0.5945 50 0.51 41
GU.TRAV.HHZ. 2021-08-01T05:38:06.30 0.1 positive manual P 193 0.4272 50 0.21 92
CH.DIX.HHZ. 2021-08-01T05:38:05.22 0.1 negative manual P 295 0.3624 50 0.23 93
GU.CIRO.HHZ. 2021-08-01T05:38:05.82 0.1 positive manual P 214 0.3939 50 0.3 91
CH.MMK.HHZ. 2021-08-01T05:38:02.68 0.3 undecidable manual S 25 0.134 122 -0.56 67
CH.MMK.HHZ. 2021-08-01T05:38:00.75 0.1 undecidable manual P 25 0.134 122 0.08 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
CH.MMK.HHN. ML:1.5 0.000286 0.08 AML other m 2021-08-01T05:38:02.78
CH.MMK.HHE. ML:1.1 0.0001265 0.28 AML other m 2021-08-01T05:38:02.74
CH.DIX.HHE. ML:2.2 0.0005875 0.26 AML other m 2021-08-01T05:38:10.65
CH.DIX.HHN. ML:2.2 0.00055 1.92 AML other m 2021-08-01T05:38:10.00
GU.CIRO.HHE. ML:1.8 0.000204 0.36 AML other m 2021-08-01T05:38:11.49
GU.CIRO.HHN. ML:1.9 0.000234 0.3 AML other m 2021-08-01T05:38:11.70
GU.TRAV.HHE. ML:1.8 0.0001875 1.4 AML other m 2021-08-01T05:38:12.11
GU.TRAV.HHN. ML:1.8 0.000202 0.86 AML other m 2021-08-01T05:38:15.71
IV.VARE.HHE. ML:1.4 4.235E-5 1.36 AML other m 2021-08-01T05:38:17.07
IV.VARE.HHN. ML:1.6 6.445E-5 1.32 AML other m 2021-08-01T05:38:18.79
IV.MRGE.HHN. ML:1.7 9.815E-5 1.58 AML other m 2021-08-01T05:38:19.11
IV.MRGE.HHE. ML:1.6 7.585E-5 1.02 AML other m 2021-08-01T05:38:19.72
GU.LSD.HHE. ML:2 0.000143 0.72 AML other m 2021-08-01T05:38:20.56
GU.LSD.HHN. ML:1.8 9.755E-5 0.56 AML other m 2021-08-01T05:38:21.27
CH.FUSIO.HHE. ML:1.7 6.12E-5 0.44 AML other m 2021-08-01T05:38:23.68
CH.MUGIO.HHN. ML:1.5 3.85E-5 0.38 AML other m 2021-08-01T05:38:24.38
CH.FUSIO.HHN. ML:1.7 6.92E-5 0.26 AML other m 2021-08-01T05:38:24.49
CH.MUGIO.HHE. ML:1.4 3.205E-5 0.94 AML other m 2021-08-01T05:38:25.31
GU.BHB.HHE. ML:1.5 2.185E-5 0.44 AML other m 2021-08-01T05:38:37.45
GU.BHB.HHN. ML:1.5 2.095E-5 1.16 AML other m 2021-08-01T05:38:38.81
IV.FNVD.HHE. ML:3.9 0.0008445 1.06 AML other m 2021-08-01T05:38:57.37
IV.FNVD.HHN. ML:3.9 0.000788 0.62 AML other m 2021-08-01T05:38:58.24
TV.SF01.EHE. ML:3.6 0.000152 1.24 AML other m 2021-08-01T05:39:57.65
TV.SF01.EHN. ML:3.5 0.00014055 0.52 AML other m 2021-08-01T05:39:57.28
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