Earthquake with magnitude of ML 1.8 on date 27-09-2021 and time 07:41:26 (Italy) in region Mar Ligure (MARE)

A magnitude ML 1.8 earthquake occured in region: Mar Ligure (MARE), on

  • 27-09-2021 05:41:26 (UTC)
  • 27-09-2021 07:41:26 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.462, 8.238 at 29 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

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

An earthquake occurred to
54 Km SE of Sanremo (54807 inhabitants)
96 Km S of Savona (61345 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 1.8 2021-09-27
05:41:26
43.4617 8.2382 29 2021-09-27
05:49:49
Sala Sismica INGV-Roma 95927291
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-27 05:41:26 ± 0.28
Latitude 43.4617 ± 0.0162
Longitude 8.2382 ± 0.0260
Depth (km) 29 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95927291

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2357
Semi-minor axis of confidence ellipse (meter) 848
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 234
Circular confidence region, given by single value of horizontal uncertainty (meter) 2360
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 256
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.33
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 1.3202
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 13
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 22
Type of magnitude ML
Reference to an origin 95927291
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-27 05:49:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.JOPP.HHZ. 2021-09-27T05:43:09.14 3.0 undecidable manual Pn -4.83 0
IX.SSB3.HHZ.02 2021-09-27T05:43:08.35 3.0 positive manual Pg 18.690001 0
IV.TDS.HHZ. 2021-09-27T05:43:07.95 3.0 undecidable manual Pn -1.31 0
IV.BRSN.EHZ. 2021-09-27T05:42:51.65 3.0 undecidable manual Sn -0.67 0
IV.SGG.HHZ. 2021-09-27T05:42:50.93 3.0 undecidable manual Pg 11.07 0
IV.BARO.EHZ. 2021-09-27T05:42:47.25 3.0 undecidable manual Sn -5.11 0
IV.PP3.EHZ. 2021-09-27T05:42:28.20 3.0 negative manual Pn 1.83 0
IV.TREG.EHZ. 2021-09-27T05:42:22.16 3.0 undecidable manual Pg 7.61 0
IV.ZEN8.EHZ. 2021-09-27T05:42:20.19 3.0 undecidable manual Pg 7.26 0
IV.NDIM.HNZ. 2021-09-27T05:42:10.97 3.0 negative manual Pg 4.12 0
GU.PZZ.HHE. 2021-09-27T05:42:07.69 0.6 undecidable manual S 323 1.3202 54 0.66 36
GU.STV.HHZ. 2021-09-27T05:41:58.99 0.6 undecidable manual S 320 1.0225 54 -0.92 40
IV.CASP.HHZ. 2021-09-27T05:41:57.44 3.0 positive manual Pn -2.13 0
GU.ENR.HHZ. 2021-09-27T05:41:57.71 0.6 undecidable manual S 323 0.9686 101 -0.65 45
GU.GBOS.HHZ. 2021-09-27T05:41:54.32 0.6 undecidable manual S 340 0.831 103 -0.04 51
IV.CELB.HHZ. 2021-09-27T05:41:51.03 3.0 negative manual Pn -2.32 0
GU.PZZ.HHE. 2021-09-27T05:41:51.11 0.6 undecidable manual P 323 1.3202 54 1.1 32
FR.SAOF.HHZ.00 2021-09-27T05:41:50.88 0.6 undecidable manual S 317 0.7204 105 -0.31 51
GU.RORO.HHZ. 2021-09-27T05:41:49.72 0.6 undecidable manual S 349 0.6619 106 0.2 52
GU.MGRO.HHZ. 2021-09-27T05:41:49.80 0.6 undecidable manual S 332 0.6583 106 0.39 49
IV.MSSA.HHZ. 2021-09-27T05:41:48.72 0.6 undecidable manual P 47 1.2564 54 -0.41 36
GU.BURY.HHZ. 2021-09-27T05:41:46.72 0.6 undecidable manual S 303 0.5882 108 -0.69 49
GU.PCP.HHZ. 2021-09-27T05:41:46.60 0.6 undecidable manual P 11 1.1017 54 -0.4 41
GU.IMI.HHZ. 2021-09-27T05:41:45.12 0.6 undecidable manual S 331 0.5135 111 -0.21 53
GU.ENR.HHZ. 2021-09-27T05:41:45.05 1.0 undecidable manual P 323 0.9686 101 0.04 25
GU.STV.HHZ. 2021-09-27T05:41:45.91 1.0 negative manual P 320 1.0225 54 0.01 25
GU.GBOS.HHZ. 2021-09-27T05:41:43.34 1.0 undecidable manual P 340 0.831 103 0.64 23
IV.QLNO.HHZ. 2021-09-27T05:41:43.37 1.0 undecidable manual P 5 0.8651 102 0.09 24
GU.CANO.HHZ. 2021-09-27T05:41:41.27 0.6 undecidable manual P 360 0.7455 104 -0.01 49
GU.RORO.HHZ. 2021-09-27T05:41:40.22 0.3 undecidable manual P 349 0.6619 106 0.32 77
GU.MGRO.HHZ. 2021-09-27T05:41:40.29 0.1 negative manual P 332 0.6583 106 0.45 99
FR.SAOF.HHZ.00 2021-09-27T05:41:40.82 0.6 positive manual P 317 0.7204 105 -0.05 52
GU.IMI.HHZ. 2021-09-27T05:41:38.02 0.1 undecidable manual P 331 0.5135 111 0.53 100
GU.BURY.HHZ. 2021-09-27T05:41:38.43 0.3 undecidable manual P 303 0.5882 108 -0.26 77
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.IMI.HHN. ML:1.8 0.000137 1.44 AML other m 2021-09-27T05:41:46.22
GU.IMI.HHE. ML:1.9 0.000145 0.6 AML other m 2021-09-27T05:41:46.31
GU.BURY.HHE. ML:1.8 0.00010375 0.14 AML other m 2021-09-27T05:41:47.15
GU.BURY.HHN. ML:1.8 0.00010405 1.7 AML other m 2021-09-27T05:41:47.94
GU.MGRO.HHN. ML:1.8 8.035E-5 1 AML other m 2021-09-27T05:41:51.71
GU.MGRO.HHE. ML:1.8 9.4E-5 0.4 AML other m 2021-09-27T05:41:51.26
FR.SAOF.HHE.00 ML:2.2 0.000181 0.06 AML other m 2021-09-27T05:41:51.24
FR.SAOF.HHN.00 ML:2 0.000129 0.78 AML other m 2021-09-27T05:41:51.81
GU.CANO.HHE. ML:1.9 9.795E-5 0.32 AML other m 2021-09-27T05:41:54.64
GU.GBOS.HHE. ML:1.5 3.58E-5 0.62 AML other m 2021-09-27T05:41:55.45
GU.CANO.HHN. ML:1.8 6.945E-5 0.18 AML other m 2021-09-27T05:41:55.16
GU.GBOS.HHN. ML:1.5 3.495E-5 0.44 AML other m 2021-09-27T05:41:55.61
IV.QLNO.HHE. ML:1.6 3.95E-5 0.98 AML other m 2021-09-27T05:41:58.58
GU.ENR.HHE. ML:1.8 5.49E-5 0.5 AML other m 2021-09-27T05:41:58.83
IV.QLNO.HHN. ML:1.6 3.53E-5 1.12 AML other m 2021-09-27T05:41:58.75
GU.ENR.HHN. ML:1.8 6.015E-5 0.68 AML other m 2021-09-27T05:41:59.32
GU.STV.HHE. ML:1.7 3.86E-5 0.9 AML other m 2021-09-27T05:42:00.17
GU.STV.HHN. ML:1.6 3.28E-5 1.12 AML other m 2021-09-27T05:42:00.67
IV.MSSA.HHN. ML:2.1 6.985E-5 0.1 AML other m 2021-09-27T05:42:05.38
IV.MSSA.HHE. ML:2.2 9.885E-5 1.32 AML other m 2021-09-27T05:42:07.13
GU.PCP.HHE. ML:1.3 1.5480835E-5 0.2208 AML other m 2021-09-27T05:42:04.11
GU.PCP.HHN. ML:1.5 1.921632E-5 11.76 AML other m 2021-09-27T05:42:02.77
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