Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 09-07-2021 and time 20:36:44 (Italy) in region Costa Ligure Occidentale (Imperia)

A magnitude ML 1.4 earthquake occured in region: Costa Ligure Occidentale (Imperia), on

  • 09-07-2021 18:36:44 (UTC)
  • 09-07-2021 20:36:44 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.7060, 8.0120 at 10 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
San Lorenzo al Mare IM 17 1297 1297
Santo Stefano al Mare IM 17 2197 3494
Cipressa IM 18 1290 4784
Costarainera IM 18 828 5612
Riva Ligure IM 18 2910 8522
Terzorio IM 19 216 8738
Pompeiana IM 19 823 9561
Civezza IM 20 609 10170
Imperia IM 20 42034 52204

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km SE of Sanremo (54807 inhabitants)
77 Km SW of Savona (61345 inhabitants)
85 Km SE of Cuneo (56081 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
Bulletin
Rev1000 		ML 1.4 2021-07-09
18:36:44		 43.7065 8.0123 10 2021-12-29
11:12:12		 Bollettino Sismico Italiano INGV 92954681
Reviewed
Rev100 		ML 1.5 2021-07-09
18:36:43		 43.696 8.0303 14 2021-07-09
18:44:45		 Sala Sismica INGV-Roma 92517051
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-09 18:36:44 ± 0.19
Latitude 43.7065 ± 0.0090
Longitude 8.0123 ± 0.0087
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 92954681

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 980
Semi-minor axis of confidence ellipse (meter) 384
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 342
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) 259
Number of associated phases, regardless of their use for origin computation 32
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.02613
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 92954681
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-01 18:39:05

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 92517051
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-09 18:44:45
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MNTT.EHZ. 2021-07-09T18:38:42.62 3.0 undecidable manual Sn 4.87 0
IV.CRJA.HHZ. 2021-07-09T18:38:41.41 3.0 undecidable manual Pg 13.98 0
SI.BOSI.HHZ. 2021-07-09T18:38:23.04 3.0 undecidable manual Sn -2.51 0
IV.PARC.HHZ. 2021-07-09T18:38:21.01 3.0 undecidable manual Sg 9.04 0
IV.MBAL.EHZ. 2021-07-09T18:38:07.29 3.0 undecidable manual Sn 1.14 0
RF.GEPF.HHZ. 2021-07-09T18:38:03.04 3.0 positive manual Pg 10.6 0
IV.VVLD.HHZ. 2021-07-09T18:38:00.11 3.0 undecidable manual Pg 6.65 0
IV.BOZZ.HNZ. 2021-07-09T18:37:53.06 3.0 undecidable manual Sn 1.15 0
IV.OFFI.HHZ. 2021-07-09T18:37:47.90 3.0 undecidable manual Pn -1.37 0
IV.TREG.EHZ. 2021-07-09T18:37:35.81 3.0 positive manual Pg 4.84 0
IV.MBAL.EHZ. 2021-07-09T18:37:29.99 3.0 negative manual Pn -0.29 0
GU.STV.HHZ. 2021-07-09T18:37:08.60 0.6 undecidable manual S 318 81.0522 50 0.17 45
IV.QLNO.HHZ. 2021-07-09T18:37:06.16 0.6 undecidable manual S 21 73.4709 50 -0.26 45
GU.ENR.HHZ. 2021-07-09T18:37:06.94 0.6 undecidable manual S 321 74.9694 50 0.14 46
GU.PZZ.HHZ. 2021-07-09T18:37:04.01 0.3 undecidable manual P 321 113.8971 50 0.79 52
GU.GBOS.HHE. 2021-07-09T18:37:02.88 0.6 undecidable manual S 347 60.8946 50 -0.18 46
GU.PCP.HHZ. 2021-07-09T18:37:01.53 0.3 undecidable manual P 24 101.8203 50 0.17 64
FR.SAOF.HHZ.00 2021-07-09T18:36:59.54 0.6 undecidable manual S 310 48.1185 50 -0.09 48
GU.RORO.HHZ. 2021-07-09T18:36:58.74 0.6 undecidable manual S 5 45.2214 50 -0.13 48
GU.STV.HHZ. 2021-07-09T18:36:58.37 0.1 undecidable manual P 318 81.0522 50 0.22 89
GU.ENR.HHZ. 2021-07-09T18:36:57.51 0.1 undecidable manual P 321 74.9694 50 0.3 88
GU.MGRO.HHZ. 2021-07-09T18:36:57.66 0.6 undecidable manual S 336 40.7259 50 0 50
GU.BURY.HHZ. 2021-07-09T18:36:56.34 0.6 undecidable manual S 283 37.4292 50 -0.45 46
IV.QLNO.HHZ. 2021-07-09T18:36:56.88 0.3 undecidable manual P 21 73.4709 50 -0.11 69
GU.GBOS.HHE. 2021-07-09T18:36:55.11 0.1 undecidable manual P 347 60.8946 50 0.06 95
GU.CANO.HHZ. 2021-07-09T18:36:54.52 0.1 undecidable manual P 18 58.3971 50 -0.14 94
GU.IMI.HHZ. 2021-07-09T18:36:53.26 0.6 undecidable manual S 337 24.5532 112 -0.06 51
FR.SAOF.HHZ.00 2021-07-09T18:36:53.00 0.3 undecidable manual P 310 48.1185 50 -0.07 73
GU.RORO.HHZ. 2021-07-09T18:36:52.62 0.1 undecidable manual P 5 45.2214 50 -0.02 99
GU.MGRO.HHZ. 2021-07-09T18:36:52.00 0.1 undecidable manual P 336 40.7259 50 0.07 98
GU.BURY.HHZ. 2021-07-09T18:36:51.11 0.1 undecidable manual P 283 37.4292 50 -0.32 94
GU.IMI.HHZ. 2021-07-09T18:36:49.29 0.1 undecidable manual P 337 24.5532 112 -0.14 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.IMI.HHE. ML:1.1 0.00007635 0.52 AML other m 2021-07-09T18:36:53.31
GU.IMI.HHN. ML:1.1 0.0000715 0.76 AML other m 2021-07-09T18:36:54.96
GU.BURY.HHE. ML:1.4 0.00009784999999999999 0.74 AML other m 2021-07-09T18:36:56.89
GU.BURY.HHN. ML:1.5 0.0001275 1.76 AML other m 2021-07-09T18:36:56.92
GU.MGRO.HHE. ML:1.2 0.0000493 0.42 AML other m 2021-07-09T18:36:58.75
GU.MGRO.HHN. ML:1.2 0.00006120000000000001 0.88 AML other m 2021-07-09T18:36:59.00
FR.SAOF.HHE.00 ML:1.5 0.00009520000000000001 0.38 AML other m 2021-07-09T18:37:00.31
FR.SAOF.HHN.00 ML:1.5 0.0000781 0.32 AML other m 2021-07-09T18:37:00.41
GU.RORO.HHN. ML:1.6 0.00011249999999999998 0.72 AML other m 2021-07-09T18:37:00.58
GU.RORO.HHE. ML:1.6 0.00011999999999999999 1.38 AML other m 2021-07-09T18:37:00.71
GU.ENR.HHE. ML:1.6 0.0000559 0.68 AML other m 2021-07-09T18:37:08.36
GU.ENR.HHN. ML:1.6 0.000057249999999999996 1.3 AML other m 2021-07-09T18:37:08.84
GU.STV.HHE. ML:1.4 0.000037199999999999996 0.66 AML other m 2021-07-09T18:37:08.86
GU.STV.HHN. ML:1.5 0.00004295 0.26 AML other m 2021-07-09T18:37:09.84
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