Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 29-07-2021 and time 14:29:25 (Italy) in region Costa Ligure Occidentale (Imperia)

A magnitude ML 0.8 earthquake occured in region: Costa Ligure Occidentale (Imperia), on

  • 29-07-2021 12:29:25 (UTC)
  • 29-07-2021 14:29:25 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.8850, 7.4240 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Olivetta San Michele IM 8 211 211
Airole IM 11 407 618
Rocchetta Nervina IM 14 298 916
Dolceacqua IM 17 2074 2990
Isolabona IM 17 679 3669
Camporosso IM 18 5632 9301
Ventimiglia IM 18 24310 33611
Apricale IM 19 629 34240
Soldano IM 20 977 35217
San Biagio della Cima IM 20 1329 36546

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km W of Sanremo (54807 inhabitants)
58 Km S of Cuneo (56081 inhabitants)
97 Km W of Savona (61345 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 		Md 1.3
ML 0.8 		2021-07-29
12:29:25		 43.8853 7.4237 10 2021-07-29
12:43:24		 Sala Sismica INGV-Roma 93353081
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-29 12:29:25 ± 0.16
Latitude 43.8853 ± 0.0072
Longitude 7.4237 ± 0.0100
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 93353081

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 980
Semi-minor axis of confidence ellipse (meter) 567
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 220
Circular confidence region, given by single value of horizontal uncertainty (meter) 980.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 204
Number of associated phases, regardless of their use for origin computation 38
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.65920
Number of stations at which the event was observed 28
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 93353081
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-29 12:43:24

Md:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 2
Type of magnitude Md
Reference to an origin 93353081
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-29 12:43:24
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MARS.HNZ. 2021-07-29T12:31:07.07 3.0 undecidable manual Pg 10.43 0
IV.PLLN.EHZ. 2021-07-29T12:31:03.41 3.0 undecidable manual Pn 0.68 0
IV.MFNL.HHZ. 2021-07-29T12:30:52.80 3.0 negative manual Pn -5.2 0
IV.MRLC.HHZ. 2021-07-29T12:30:46.52 3.0 undecidable manual Pn -0.37 0
IV.CDRU.HHZ. 2021-07-29T12:30:46.11 3.0 undecidable manual Pn -1.17 0
IX.RSF3.HHZ.02 2021-07-29T12:30:39.08 3.0 undecidable manual Pn -3.52 0
IV.FIU.EHZ. 2021-07-29T12:30:36.94 3.0 undecidable manual Sg 8.6 0
IV.SACS.HHZ. 2021-07-29T12:30:36.46 3.0 undecidable manual Sn 0.22 0
OX.CLUD.HHZ. 2021-07-29T12:30:32.92 3.0 negative manual Pg 12.03 0
IV.TST02.HHZ. 2021-07-29T12:30:31.52 3.0 undecidable manual Pn 2.71 0
MN.TRI.HHZ. 2021-07-29T12:30:31.81 3.0 negative manual Pg 9.15 0
IV.IMOL.HNZ. 2021-07-29T12:30:30.34 3.0 undecidable manual Sn -0.24 0
NI.VINO.HHZ. 2021-07-29T12:30:25.52 3.0 negative manual Pn 3.25 0
IV.CADC.HNZ. 2021-07-29T12:30:23.27 3.0 undecidable manual Sg 2.21 0
IV.NDIM.HHZ. 2021-07-29T12:30:18.76 3.0 undecidable manual Sn -2.89 0
OX.CIMO.HHZ. 2021-07-29T12:30:15.24 3.0 undecidable manual Pn -1.18 0
IV.RCAV.EHZ. 2021-07-29T12:30:15.16 3.0 undecidable manual Pn -1.39 0
IV.OPPE.HNZ. 2021-07-29T12:29:59.22 3.0 negative manual Pn 0.96 0
IV.IMOL.HNZ. 2021-07-29T12:29:56.69 3.0 undecidable manual Pn -1.15 0
IV.CAPR.HNZ. 2021-07-29T12:29:56.99 3.0 undecidable manual Pg 3.48 0
GU.PZZ.HHE. 2021-07-29T12:29:46.90 0.3 undecidable manual S 341 73.1712 50 -0.26 68
GU.RORO.HHE. 2021-07-29T12:29:42.87 0.3 undecidable manual S 64 57.1983 50 -0.02 73
GU.GBOS.HHE. 2021-07-29T12:29:41.17 0.3 undecidable manual S 40 51.6039 50 -0.24 71
GU.PZZ.HHE. 2021-07-29T12:29:38.04 0.3 undecidable manual P 341 73.1712 50 0.23 68
GU.IMI.HHZ. 2021-07-29T12:29:37.54 0.3 undecidable manual S 86 37.629 50 -0.14 74
GU.ENR.HHZ. 2021-07-29T12:29:37.53 0.3 undecidable manual S 359 38.1285 50 -0.29 72
GU.STV.HHZ. 2021-07-29T12:29:37.89 0.3 undecidable manual S 349 40.626 50 -0.6 66
GU.MGRO.HHE. 2021-07-29T12:29:36.95 0.3 undecidable manual S 60 35.3424 50 -0.11 75
GU.RORO.HHE. 2021-07-29T12:29:35.81 0.3 undecidable manual P 64 57.1983 50 0.47 67
GU.GBOS.HHE. 2021-07-29T12:29:34.51 0.6 undecidable manual P 40 51.6039 50 0.03 49
GU.STV.HHZ. 2021-07-29T12:29:33.00 0.1 undecidable manual P 349 40.626 50 0.2 97
GU.MGRO.HHE. 2021-07-29T12:29:32.27 0.1 undecidable manual P 60 35.3424 50 0.29 96
GU.IMI.HHZ. 2021-07-29T12:29:32.61 0.1 undecidable manual P 86 37.629 50 0.28 96
GU.ENR.HHZ. 2021-07-29T12:29:32.70 0.1 undecidable manual P 359 38.1285 50 0.28 96
FR.SAOF.HHZ.00 2021-07-29T12:29:31.36 0.3 undecidable manual S 43 15.1737 124 -0.07 78
GU.BURY.HHE. 2021-07-29T12:29:31.00 0.6 undecidable manual S 137 15.5733 124 -0.54 47
FR.SAOF.HHZ.00 2021-07-29T12:29:28.98 0.1 undecidable manual P 43 15.1737 124 0.26 100
GU.BURY.HHE. 2021-07-29T12:29:28.48 0.1 undecidable manual P 137 15.5733 124 -0.31 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
FR.SAOF.HHN.00 ML:1.0 0.00010499999999999999 0.9 AML other m 2021-07-29T12:29:31.07
FR.SAOF.HHE.00 ML:0.9 0.00008115 1.12 AML other m 2021-07-29T12:29:31.68
GU.ENR.HHE. ML:0.8 0.000024 0.32 AML other m 2021-07-29T12:29:37.50
GU.ENR.HHN. ML:0.8 0.000025300000000000002 0.32 AML other m 2021-07-29T12:29:37.68
GU.STV.HHE. ML:0.6 0.000014331582499999999 0.1408 AML other m 2021-07-29T12:29:38.12
GU.STV.HHN. ML:0.2 0.00000649475 0.0832 AML other m 2021-07-29T12:29:38.13
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