Earthquake (controlled explosion) with magnitude of ML 1.3 on date 06-04-2022 and time 16:13:22 (Italy) in region Costa Ligure orientale (La Spezia)

A magnitude ML 1.3 (controlled explosion) earthquake occured in region: Costa Ligure orientale (La Spezia), on

  • 06-04-2022 14:13:22 (UTC)
  • 06-04-2022 16:13:22 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0100, 9.8300 at 0 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Event type: controlled explosion.

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

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Portovenere SP 5 3630 3630
Lerici SP 10 10228 13858
La Spezia SP 11 93959 107817
Ameglia SP 12 4365 112182
Riomaggiore SP 13 1576 113758
Arcola SP 13 10607 124365
Vezzano Ligure SP 15 7356 131721
Sarzana SP 16 21976 153697
Riccò del Golfo di Spezia SP 17 3698 157395
Follo SP 17 6337 163732
Castelnuovo Magra SP 18 8415 172147
Vernazza SP 18 848 172995
Santo Stefano di Magra SP 18 9360 182355
Ortonovo SP 19 8277 190632

Municipalities with at least 50000 inhabitants

An earthquake occurred to
11 Km S of La Spezia (93959 inhabitants)
23 Km W of Carrara (63133 inhabitants)
25 Km W of Massa (69479 inhabitants)
37 Km W of Viareggio (62467 inhabitants)
56 Km NW of Pisa (89158 inhabitants)
57 Km W of Lucca (89046 inhabitants)
64 Km NW of Livorno (159219 inhabitants)
84 Km SE of Genova (586655 inhabitants)
88 Km W of Pistoia (90315 inhabitants)
97 Km SW of Parma (192836 inhabitants)
100 Km SW of Reggio nell'Emilia (171345 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000
ML 1.3 2022-04-06
14:13:22
44.0098 9.8303 0 2022-07-08
12:33:42
Bollettino Sismico Italiano INGV 102866181
Reviewed
Rev100
ML 1.3 2022-04-06
14:13:23
44.0492 9.8652 10 2022-04-06
14:44:58
Sala Sismica INGV-Roma 102841731
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2022-04-06 14:13:22 ± 0.28
Latitude 44.0098 ± 0.0198
Longitude 9.8303 ± 0.0200
Depth (km) 0 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type controlled explosion
Origin ID 102866181

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2510
Semi-minor axis of confidence ellipse (meter) 1100
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 30
Circular confidence region, given by single value of horizontal uncertainty (meter) 2510.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 187
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.39
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.90742
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 102866181
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-04-07 09:54:48

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 102841731
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2022-04-06 14:44:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.VAGA.HNZ. 2022-04-06T14:15:20.76 3.0 undecidable manual Sn 1.53 0
IV.ARRO.EHZ. 2022-04-06T14:14:43.12 3.0 undecidable manual Sg 2.55 0
IV.CMPR.HHZ. 2022-04-06T14:14:43.18 3.0 positive manual Pn -3.79 0
IV.FOSV.EHZ. 2022-04-06T14:14:31.92 3.0 undecidable manual Sn -0.16 0
GU.RSP.HNZ. 2022-04-06T14:14:30.82 3.0 undecidable manual Sn 1.44 0
IV.MMO1.EHZ. 2022-04-06T14:14:18.48 3.0 undecidable manual Pg 9.03 0
IV.ARVD.HHZ. 2022-04-06T14:14:04.35 3.0 negative manual Pn 1.45 0
IV.MPPT.EHZ. 2022-04-06T14:13:40.89 0.3 undecidable manual P 93 0.9074 50 0.37 73
GU.RNCA.HHZ. 2022-04-06T14:13:39.01 0.3 undecidable manual P 307 0.7806 50 0.67 68
GU.POPM.HHZ. 2022-04-06T14:13:36.18 0.6 undecidable manual P 87 0.6664 50 -0.22 53
GU.GORR.HHZ. 2022-04-06T14:13:36.72 0.3 undecidable manual P 327 0.7105 50 -0.43 75
IV.ERBM.EHE. 2022-04-06T14:13:34.04 0.3 undecidable manual P 45 0.5846 50 -0.95 63
IV.PII.HHZ. 2022-04-06T14:13:34.57 0.3 undecidable manual P 120 0.5774 50 -0.3 79
IV.BDI.HHZ. 2022-04-06T14:13:34.24 0.3 undecidable manual P 84 0.5522 50 -0.21 81
GU.MAIM.HHZ. 2022-04-06T14:13:33.05 0.3 undecidable manual P 101 0.4856 90 0.08 84
GU.GRAM.HHZ. 2022-04-06T14:13:33.32 0.3 undecidable manual P 19 0.5090 90 -0.17 82
GU.CARD.HHZ. 2022-04-06T14:13:32.68 0.3 undecidable manual P 88 0.4685 90 0.09 84
IV.MSSA.HHZ. 2022-04-06T14:13:30.64 0.3 undecidable manual P 324 0.3795 90 0.03 87
GU.EQUI.HHZ. 2022-04-06T14:13:29.06 0.1 undecidable manual P 56 0.2797 90 0.68 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.EQUI.HHE. ML:0.8 0.000031100000000000004 0.76 AML other m 2022-04-06T14:13:29.69
GU.EQUI.HHN. ML:0.8 0.000032550000000000005 1.02 AML other m 2022-04-06T14:13:30.87
IV.MSSA.HHE. ML:1.5 0.00010792846 0.8416 AML other m 2022-04-06T14:13:33.76
GU.CARD.HHN. ML:1.6 0.00009425 1.24 AML other m 2022-04-06T14:13:36.16
GU.MAIM.HHE. ML:0.9 0.000020778845 0.1408 AML other m 2022-04-06T14:13:36.23
GU.GRAM.HHE. ML:1.4 0.00005463278 1.2608 AML other m 2022-04-06T14:13:37.71
GU.CARD.HHE. ML:1.4 0.0000636 0.94 AML other m 2022-04-06T14:13:37.09
GU.MAIM.HHN. ML:1.0 0.000022500785000000002 0.5024 AML other m 2022-04-06T14:13:37.33
GU.GRAM.HHN. ML:1.4 0.00005809705499999999 0.7552 AML other m 2022-04-06T14:13:37.60
IV.MSSA.HHN. ML:1.6 0.00014635025 0.096 AML other m 2022-04-06T14:13:38.23
IV.BDI.HHN. ML:1.0 0.000020549999999999998 0.92 AML other m 2022-04-06T14:13:42.13
IV.BDI.HHE. ML:1.2 0.00002755 0.76 AML other m 2022-04-06T14:13:44.57
GU.POPM.HHN. ML:1.4 0.00003435 0.68 AML other m 2022-04-06T14:13:49.34
GU.POPM.HHE. ML:1.4 0.000039349999999999994 1 AML other m 2022-04-06T14:13:49.17
GU.GORR.HHE. ML:1.2 0.000019791650000000002 0.8032 AML other m 2022-04-06T14:13:49.74
GU.GORR.HHN. ML:1.2 0.000023298280000000002 0.3456 AML other m 2022-04-06T14:13:50.82
GU.RNCA.HHE. ML:1.4 0.0000369 0.36 AML other m 2022-04-06T14:13:52.75
GU.RNCA.HHN. ML:1.4 0.00003265 0.42 AML other m 2022-04-06T14:13:53.77
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, http://terremoti.ingv.it/tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download