Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 29-08-2021 and time 20:39:48 (Italy) in region 1 km SE Savignone (GE)

A magnitude ML 0.8 earthquake occured in region: 1 km SE Savignone (GE), on

  • 29-08-2021 18:39:48 (UTC)
  • 29-08-2021 20:39:48 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.5600, 8.9930 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
Savignone GE 1 3205 3205
Casella GE 3 3144 6349
Crocefieschi GE 4 548 6897
Busalla GE 4 5563 12460
Valbrevenna GE 6 798 13258
Vobbia GE 6 409 13667
Ronco Scrivia GE 6 4417 18084
Montoggio GE 6 2067 20151
Mignanego GE 7 3675 23826
Serra Riccò GE 7 7885 31711
Sant'Olcese GE 9 5906 37617
Fraconalto AL 10 336 37953
Campomorone GE 10 6996 44949
Ceranesi GE 10 3875 48824
Isola del Cantone GE 10 1540 50364
Mongiardino Ligure AL 10 165 50529
Davagna GE 13 1884 52413
Roccaforte Ligure AL 14 136 52549
Voltaggio AL 14 738 53287
Torriglia GE 14 2311 55598
Bargagli GE 15 2708 58306
Cabella Ligure AL 15 528 58834
Propata GE 15 142 58976
Grondona AL 16 510 59486
Carrega Ligure AL 16 84 59570
Arquata Scrivia AL 17 6409 65979
Carrosio AL 17 510 66489
Albera Ligure AL 17 325 66814
Rocchetta Ligure AL 17 200 67014
Genova GE 17 586655 653669
Lumarzo GE 17 1535 655204
Rondanina GE 18 62 655266
Cantalupo Ligure AL 18 527 655793
Vignole Borbera AL 18 2182 657975
Bosio AL 19 1227 659202
Fascia GE 19 81 659283
Borghetto di Borbera AL 19 1966 661249
Neirone GE 20 916 662165

Municipalities with at least 50000 inhabitants

An earthquake occurred to
17 Km N of Genova (586655 inhabitants)
49 Km NE of Savona (61345 inhabitants)
49 Km SE of Alessandria (93943 inhabitants)
71 Km S of Pavia (72576 inhabitants)
73 Km SE of Asti (76202 inhabitants)
78 Km SW of Piacenza (102191 inhabitants)
83 Km NW of La Spezia (93959 inhabitants)
85 Km S of Vigevano (63310 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 2021-08-29
18:39:48		 44.5603 8.9928 10 2021-08-29
18:45:23		 Sala Sismica INGV-Roma 94793791
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-29 18:39:48 ± 0.12
Latitude 44.5603 ± 0.0099
Longitude 8.9928 ± 0.0076
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 94793791

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1082
Semi-minor axis of confidence ellipse (meter) 272
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 165
Circular confidence region, given by single value of horizontal uncertainty (meter) 1080.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 171
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.09443
Epicentral distance of station farthest from the epicenter (degree) 0.44696
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 94793791
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-29 18:45:23
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MSSA.HHZ. 2021-08-29T18:40:04.28 0.6 undecidable manual S 123 49.617 50 -0.23 45
GU.PCP.HHZ. 2021-08-29T18:40:00.84 0.6 undecidable manual S 267 35.4423 50 0.11 47
IV.MSSA.HHZ. 2021-08-29T18:39:58.21 0.6 undecidable manual P 123 49.617 50 0.42 43
GU.GORR.HHZ. 2021-08-29T18:39:57.63 0.6 undecidable manual S 78 24.2535 113 -0.1 48
GU.PCP.HHZ. 2021-08-29T18:39:55.31 0.6 negative manual P 267 35.4423 50 -0.29 45
GU.GORR.HHZ. 2021-08-29T18:39:53.93 0.3 undecidable manual P 78 24.2535 113 0.05 73
GU.RNCA.HHZ. 2021-08-29T18:39:53.60 0.6 undecidable manual S 198 10.4784 134 -0.06 50
GU.RNCA.HHZ. 2021-08-29T18:39:51.57 0.1 positive manual P 198 10.4784 134 0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.GORR.HHN. ML:0.8 0.000033936430000000005 0.1792 AML other m 2021-08-29T18:39:57.84
GU.GORR.HHE. ML:0.8 0.00003705 0.18 AML other m 2021-08-29T18:39:58.70
IV.MSSA.HHN. ML:1.1 0.000031549848 0.0896 AML other m 2021-08-29T18:40:05.32
IV.MSSA.HHE. ML:1.2 0.0000423599 0.1024 AML other m 2021-08-29T18:40:05.32
GU.RNCA.HHE. ML:0.6 0.000051966595 0.0896 AML other m 2021-08-29T18:39:53.88
GU.RNCA.HHN. ML:0.8 0.000084285055 0.1024 AML other m 2021-08-29T18:39:54.06
GU.PCP.HHE. ML:0.4 0.000011415913499999999 0.4992 AML other m 2021-08-29T18:40:03.87
GU.PCP.HHN. ML:0.6 0.000014771165 1.4208 AML other m 2021-08-29T18:39:55.33
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