Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 23-05-2022 and time 11:46:53 (Italy) in region Costa Ligure orientale (La Spezia)

A magnitude ML 1.2 earthquake occured in region: Costa Ligure orientale (La Spezia), on

  • 23-05-2022 09:46:53 (UTC)
  • 23-05-2022 11:46:53 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0280, 9.9160 at 9 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.

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
Lerici SP 5 10228 10228
Ameglia SP 6 4365 14593
Portovenere SP 7 3630 18223
Arcola SP 10 10607 28830
Sarzana SP 10 21976 50806
La Spezia SP 11 93959 144765
Castelnuovo Magra SP 12 8415 153180
Ortonovo SP 12 8277 161457
Vezzano Ligure SP 13 7356 168813
Fosdinovo MS 15 4883 173696
Santo Stefano di Magra SP 15 9360 183056
Carrara MS 16 63133 246189
Follo SP 16 6337 252526
Riomaggiore SP 16 1576 254102
Bolano SP 18 7813 261915
Massa MS 18 69479 331394
Riccò del Golfo di Spezia SP 19 3698 335092
Podenzana MS 20 2180 337272

Municipalities with at least 50000 inhabitants

An earthquake occurred to
11 Km SE of La Spezia (93959 inhabitants)
16 Km W of Carrara (63133 inhabitants)
18 Km W of Massa (69479 inhabitants)
32 Km NW of Viareggio (62467 inhabitants)
51 Km W of Lucca (89046 inhabitants)
52 Km NW of Pisa (89158 inhabitants)
62 Km NW of Livorno (159219 inhabitants)
81 Km W of Pistoia (90315 inhabitants)
89 Km E of Genova (586655 inhabitants)
92 Km SW of Parma (192836 inhabitants)
94 Km SW of Reggio nell'Emilia (171345 inhabitants)
96 Km W of Prato (191150 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 1.2 2022-05-23
09:46:53		 44.0282 9.9157 9 2023-01-31
19:03:37		 Bollettino Sismico Italiano INGV 109244831
Reviewed
Rev100 		ML 1.1 2022-05-23
09:46:53		 44.0035 9.9342 8 2022-05-23
09:54:23		 Sala Sismica INGV-Roma 105047491
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2022-05-23 09:46:53 ± 0.17
Latitude 44.0282 ± 0.0144
Longitude 9.9157 ± 0.0100
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 109244831

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1630
Semi-minor axis of confidence ellipse (meter) 725
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 6
Circular confidence region, given by single value of horizontal uncertainty (meter) 1630.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 191
Number of associated phases, regardless of their use for origin computation 25
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.32
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.60434
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 105047491
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2022-05-23 09:54:23

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 109244831
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-09-02 10:56:17
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RNI2.HHZ. 2022-05-23T09:48:38.39 3.0 undecidable manual Sn -2.72 0
MN.BNI.HHZ. 2022-05-23T09:48:09.54 3.0 undecidable manual Sn 0.65 0
IV.PAOL.HHZ. 2022-05-23T09:48:04.20 3.0 undecidable manual Pn 1.18 0
IV.FOSV.EHZ. 2022-05-23T09:48:04.25 3.0 undecidable manual Sg 4.45 0
SI.LUSI.HHZ. 2022-05-23T09:47:56.21 3.0 undecidable manual Sn -1.29 0
IV.PIEI.HHZ. 2022-05-23T09:47:55.41 3.0 undecidable manual Sn 1.22 0
IV.LATE.HHZ. 2022-05-23T09:47:53.56 3.0 undecidable manual Sn -0.77 0
IV.IMOL.HNZ. 2022-05-23T09:47:39.42 3.0 undecidable manual S -0.26 0
IV.BDI.HHZ. 2022-05-23T09:47:10.44 0.6 undecidable manual S 86 54.3012 50 -0.5 41
GU.SARM.EHN. 2022-05-23T09:47:07.38 0.6 undecidable manual S 66 42.3243 50 -0.35 44
GU.CARD.HHZ. 2022-05-23T09:47:07.90 0.6 undecidable manual S 90 45.2214 50 -0.59 41
IV.MSSA.HHZ. 2022-05-23T09:47:07.82 0.6 undecidable manual S 315 45.0216 50 -0.62 40
MN.VLC.HHZ. 2022-05-23T09:47:06.80 0.3 undecidable manual S 69 40.2264 50 -0.37 66
GU.POPM.HHZ. 2022-05-23T09:47:05.92 0.1 positive manual P 88 67.0773 50 0.36 83
GU.GRAM.HHZ. 2022-05-23T09:47:04.15 0.3 undecidable manual P 13 52.6029 50 0.82 55
IV.BDI.HHZ. 2022-05-23T09:47:03.77 0.3 undecidable manual P 86 54.3012 50 0.17 67
GU.EQUI.HHZ. 2022-05-23T09:47:02.38 0.6 undecidable manual S 51 24.3534 111 -0.22 46
IV.MSSA.HHZ. 2022-05-23T09:47:02.30 0.3 undecidable manual P 315 45.0216 50 0.14 68
GU.MAIM.HHZ. 2022-05-23T09:47:02.54 0.3 undecidable manual P 105 47.7189 50 -0.04 69
GU.SARM.EHN. 2022-05-23T09:47:02.00 0.1 undecidable manual P 66 42.3243 50 0.25 89
GU.CARD.HHZ. 2022-05-23T09:47:02.08 0.3 undecidable manual P 90 45.2214 50 -0.11 69
MN.VLC.HHZ. 2022-05-23T09:47:01.63 0.3 undecidable manual P 69 40.2264 50 0.21 68
GU.EQUI.HHZ. 2022-05-23T09:46:59.08 0.1 undecidable manual P 51 24.3534 111 0.3 91
IV.PLMA.HHZ. 2022-05-23T09:46:56.85 0.3 undecidable manual S 296 5.4945 149 -0.44 68
IV.PLMA.HHZ. 2022-05-23T09:46:55.71 0.1 undecidable manual P 296 5.4945 149 -0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.EQUI.HHE. ML:0.9 0.000044149999999999996 0.82 AML other m 2022-05-23T09:47:02.41
GU.EQUI.HHN. ML:1.0 0.00005355 0.6 AML other m 2022-05-23T09:47:03.38
GU.CARD.HHN. ML:1.2 0.00005069999999999999 0.28 AML other m 2022-05-23T09:47:08.13
IV.MSSA.HHE. ML:1.7 0.0001605 0.1 AML other m 2022-05-23T09:47:08.78
IV.MSSA.HHN. ML:1.7 0.0001395 0.1 AML other m 2022-05-23T09:47:09.56
GU.CARD.HHE. ML:1.1 0.0000327 1.12 AML other m 2022-05-23T09:47:11.58
IV.BDI.HHE. ML:0.9 0.00001775 1.4 AML other m 2022-05-23T09:47:15.00
IV.BDI.HHN. ML:0.8 0.00001575 0.84 AML other m 2022-05-23T09:47:16.61
GU.POPM.HHN. ML:1.4 0.0000388 1.12 AML other m 2022-05-23T09:47:17.17
GU.POPM.HHE. ML:1.4 0.000039349999999999994 0.18 AML other m 2022-05-23T09:47:17.45
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