Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 26-03-2021 and time 20:44:21 (Italy) in region Santo Stefano di Magra (SP)

A magnitude ML 1.8 earthquake occured in region: Santo Stefano di Magra (SP), on

  • 26-03-2021 19:44:21 (UTC)
  • 26-03-2021 20:44:21 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.1610, 9.9110 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
Santo Stefano di Magra SP 1 9360 9360
Vezzano Ligure SP 3 7356 16716
Bolano SP 3 7813 24529
Follo SP 4 6337 30866
Arcola SP 5 10607 41473
Podenzana MS 6 2180 43653
Sarzana SP 7 21976 65629
Aulla MS 7 11263 76892
La Spezia SP 9 93959 170851
Fosdinovo MS 9 4883 175734
Tresana MS 9 2044 177778
Lerici SP 9 10228 188006
Calice al Cornoviglio SP 11 1138 189144
Castelnuovo Magra SP 11 8415 197559
Ameglia SP 11 4365 201924
Riccò del Golfo di Spezia SP 12 3698 205622
Beverino SP 12 2429 208051
Portovenere SP 13 3630 211681
Ortonovo SP 14 8277 219958
Villafranca in Lunigiana MS 15 4770 224728
Pignone SP 15 565 225293
Riomaggiore SP 15 1576 226869
Licciana Nardi MS 16 4949 231818
Rocchetta di Vara SP 16 703 232521
Borghetto di Vara SP 17 938 233459
Brugnato SP 17 1270 234729
Carrara MS 18 63133 297862
Mulazzo MS 18 2424 300286
Vernazza SP 18 848 301134
Zignago SP 19 532 301666
Bagnone MS 19 1887 303553
Fivizzano MS 19 7925 311478
Filattiera MS 19 2309 313787

Municipalities with at least 50000 inhabitants

An earthquake occurred to
9 Km NE of La Spezia (93959 inhabitants)
18 Km NW of Carrara (63133 inhabitants)
23 Km NW of Massa (69479 inhabitants)
43 Km NW of Viareggio (62467 inhabitants)
59 Km NW of Lucca (89046 inhabitants)
63 Km NW of Pisa (89158 inhabitants)
75 Km NW of Livorno (159219 inhabitants)
79 Km SW of Parma (192836 inhabitants)
83 Km E of Genova (586655 inhabitants)
83 Km SW of Reggio nell'Emilia (171345 inhabitants)
84 Km W of Pistoia (90315 inhabitants)
97 Km SW of Modena (184973 inhabitants)
100 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 1.8 2021-03-26
19:44:21		 44.1612 9.911 10 2021-07-12
16:55:04		 Bollettino Sismico Italiano INGV 88639701
Reviewed
Rev100 		ML 1.9 2021-03-26
19:44:21		 44.1648 9.9097 10 2021-03-26
19:53:08		 Sala Sismica INGV-Roma 88501731
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-26 19:44:21 ± 0.11
Latitude 44.1612 ± 0.0072
Longitude 9.9110 ± 0.0063
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 88639701

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 745
Semi-minor axis of confidence ellipse (meter) 321
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 191
Circular confidence region, given by single value of horizontal uncertainty (meter) 740.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 73
Number of associated phases, regardless of their use for origin computation 32
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.36
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.20059
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 15
Magnitudes information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 88501731
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-26 19:53:08

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 19
Type of magnitude ML
Reference to an origin 88639701
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-04-08 15:40:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.BLANC.HHZ. 2021-03-26T19:45:45.07 3.0 undecidable manual Sg 7.59 0
MN.TRI.HHZ. 2021-03-26T19:45:10.67 3.0 negative manual Pn 0.22 0
IV.MMO1.EHZ. 2021-03-26T19:45:04.92 3.0 undecidable manual Pn -0.53 0
IV.BRSN.EHZ. 2021-03-26T19:44:48.80 3.0 undecidable manual Pn 0.05 0
GU.RNCA.HHE. 2021-03-26T19:44:45.97 0.6 undecidable manual S 295 83.5497 50 -0.43 41
IV.PII.HHZ. 2021-03-26T19:44:43.28 0.6 undecidable manual S 135 69.1752 50 0.74 38
GU.CANO.HHZ. 2021-03-26T19:44:43.24 0.3 undecidable manual P 273 133.2666 50 -0.25 57
GU.GORR.HHZ. 2021-03-26T19:44:42.96 0.3 undecidable manual S 315 69.6747 50 0.28 65
GU.GSCL.HHZ. 2021-03-26T19:44:39.91 0.1 undecidable manual S 68 57.6978 50 0.4 86
IV.BDI.HHZ. 2021-03-26T19:44:38.48 0.1 undecidable manual S 101 55.5999 50 -0.46 85
GU.MAIM.HHE. 2021-03-26T19:44:37.63 0.6 undecidable manual S 121 53.9016 50 -0.84 37
GU.CARD.HHZ. 2021-03-26T19:44:36.05 0.6 undecidable manual S 108 47.9187 50 -0.83 38
GU.RNCA.HHE. 2021-03-26T19:44:36.34 0.3 undecidable manual P 295 83.5497 50 0.5 60
IV.BOB.HHE. 2021-03-26T19:44:35.31 0.6 undecidable manual P 332 76.6677 50 0.54 40
GU.GORR.HHZ. 2021-03-26T19:44:33.69 0.1 undecidable manual P 315 69.6747 50 0 92
IV.PII.HHZ. 2021-03-26T19:44:33.97 0.1 undecidable manual P 135 69.1752 50 0.36 85
GU.SARM.EHE. 2021-03-26T19:44:33.95 0.6 undecidable manual S 86 39.0276 50 -0.56 43
GU.GRAM.HHZ. 2021-03-26T19:44:33.84 0.6 undecidable manual S 18 38.5281 50 -0.53 43
IV.MSSA.HHZ. 2021-03-26T19:44:32.48 0.6 undecidable manual S 299 35.742 50 -1.15 33
GU.GSCL.HHZ. 2021-03-26T19:44:32.51 0.1 positive manual P 68 57.6978 50 0.65 80
IV.BDI.HHZ. 2021-03-26T19:44:31.76 0.1 undecidable manual P 101 55.5999 50 0.23 90
GU.MAIM.HHE. 2021-03-26T19:44:31.48 0.1 undecidable manual P 121 53.9016 50 0.22 90
GU.CARD.HHZ. 2021-03-26T19:44:30.46 0.1 undecidable manual P 108 47.9187 50 0.12 93
GU.GRAM.HHZ. 2021-03-26T19:44:28.99 0.1 positive manual P 18 38.5281 50 0.1 95
GU.SARM.EHE. 2021-03-26T19:44:28.97 0.1 undecidable manual P 86 39.0276 50 -0.01 97
GU.FIVI.HNE. 2021-03-26T19:44:28.64 0.6 undecidable manual S 63 19.2696 118 -0.3 47
IV.MSSA.HHZ. 2021-03-26T19:44:28.14 0.1 negative manual P 299 35.742 50 -0.32 91
GU.EQUI.HHZ. 2021-03-26T19:44:28.32 0.6 undecidable manual S 88 19.2696 118 -0.62 43
IV.PLMA.HHZ. 2021-03-26T19:44:26.86 0.3 undecidable manual S 200 13.1757 127 -0.29 72
GU.EQUI.HHZ. 2021-03-26T19:44:25.74 0.1 undecidable manual P 88 19.2696 118 -0.02 100
GU.FIVI.HNE. 2021-03-26T19:44:25.91 0.1 positive manual P 63 19.2696 118 0.15 97
IV.PLMA.HHZ. 2021-03-26T19:44:24.91 0.1 positive manual P 200 13.1757 127 0.18 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PLMA.HHE. ML:1.9 0.0008985 1.84 AML other m 2021-03-26T19:44:26.92
IV.PLMA.HHN. ML:1.8 0.0006784830500000001 0.2048 AML other m 2021-03-26T19:44:27.07
GU.EQUI.HHN. ML:1.2 0.00011239770000000001 0.2432 AML other m 2021-03-26T19:44:28.59
GU.EQUI.HHE. ML:1.5 0.0002364104 0.704 AML other m 2021-03-26T19:44:28.72
IV.MSSA.HHN. ML:2.3 0.0008055000000000001 0.1 AML other m 2021-03-26T19:44:32.60
IV.MSSA.HHE. ML:2.5 0.00135 0.1 AML other m 2021-03-26T19:44:32.84
GU.GRAM.HHE. ML:1.6 0.00014119715 0.2176 AML other m 2021-03-26T19:44:34.07
GU.GRAM.HHN. ML:1.8 0.00023793740000000002 0.3584 AML other m 2021-03-26T19:44:34.12
GU.CARD.HHN. ML:2.0 0.00029238275000000003 0.192 AML other m 2021-03-26T19:44:36.32
GU.CARD.HHE. ML:2.1 0.00032930515 0.1152 AML other m 2021-03-26T19:44:36.33
IV.BDI.HHE. ML:1.9 0.00017299999999999998 0.18 AML other m 2021-03-26T19:44:38.77
IV.BDI.HNE. ML:2.0 0.00020928720000000002 0.2432 AML other m 2021-03-26T19:44:38.69
IV.BDI.HHN. ML:1.8 0.0001535 0.4 AML other m 2021-03-26T19:44:38.92
GU.GSCL.HHE. ML:1.9 0.000162 0.26 AML other m 2021-03-26T19:44:40.25
GU.GSCL.HHN. ML:2.1 0.00026849999999999997 0.24 AML other m 2021-03-26T19:44:40.40
GU.GORR.HHN. ML:1.6 0.000062531985 0.3712 AML other m 2021-03-26T19:44:43.47
IV.PII.HHN. ML:1.7 0.00008369246999999999 0.3584 AML other m 2021-03-26T19:44:43.77
IV.PII.HHE. ML:1.7 0.00008768526 0.5248 AML other m 2021-03-26T19:44:43.77
GU.GORR.HHE. ML:1.8 0.000094404455 0.704 AML other m 2021-03-26T19:44:43.68
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