Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 04-04-2020 and time 10:44:33 (UTC) in region 3 km NW Tresana (MS)

A magnitude ML 1.6 earthquake occured in region: 3 km NW Tresana (MS), on

  • 04-04-2020 10:44:33 (UTC)
  • 04-04-2020 12:44:33 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2590, 9.9260 at 8 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
Tresana MS 3 2044 2044
Villafranca in Lunigiana MS 4 4770 6814
Podenzana MS 6 2180 8994
Aulla MS 6 11263 20257
Mulazzo MS 7 2424 22681
Calice al Cornoviglio SP 7 1138 23819
Bolano SP 8 7813 31632
Filattiera MS 8 2309 33941
Bagnone MS 8 1887 35828
Licciana Nardi MS 9 4949 40777
Santo Stefano di Magra SP 11 9360 50137
Follo SP 12 6337 56474
Rocchetta di Vara SP 13 703 57177
Vezzano Ligure SP 13 7356 64533
Pontremoli MS 14 7357 71890
Beverino SP 14 2429 74319
Zignago SP 15 532 74851
Fosdinovo MS 16 4883 79734
Fivizzano MS 16 7925 87659
Arcola SP 16 10607 98266
Brugnato SP 16 1270 99536
Sarzana SP 16 21976 121512
Borghetto di Vara SP 17 938 122450
Zeri MS 17 1094 123544
Riccò del Golfo di Spezia SP 17 3698 127242
Comano MS 17 714 127956
Pignone SP 18 565 128521
La Spezia SP 19 93959 222480
Castelnuovo Magra SP 19 8415 230895

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km NE of La Spezia (93959 inhabitants)
24 Km NW of Carrara (63133 inhabitants)
30 Km NW of Massa (69479 inhabitants)
51 Km NW of Viareggio (62467 inhabitants)
65 Km NW of Lucca (89046 inhabitants)
68 Km SW of Parma (192836 inhabitants)
71 Km NW of Pisa (89158 inhabitants)
74 Km SW of Reggio nell'Emilia (171345 inhabitants)
81 Km E of Genova (586655 inhabitants)
84 Km NW of Livorno (159219 inhabitants)
87 Km W of Pistoia (90315 inhabitants)
90 Km S of Piacenza (102191 inhabitants)
90 Km W of Modena (184973 inhabitants)
96 Km SW of Carpi (70699 inhabitants)
98 Km S of Cremona (71901 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 1.6 2020-04-04
10:44:33		 44.2588 9.9263 8 2020-07-18
21:08:36		 Bollettino Sismico Italiano INGV 79079311
Reviewed
Rev100 		ML 1.5 2020-04-04
10:44:33		 44.2673 9.9383 8 2020-04-04
10:59:15		 Sala Sismica INGV-Roma 77867311
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-04-04 10:44:33 ± 0.13
Latitude 44.2588 ± 0.0126
Longitude 9.9263 ± 0.0100
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 79079311

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1550
Semi-minor axis of confidence ellipse (meter) 420
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 25
Circular confidence region, given by single value of horizontal uncertainty (meter) 1550.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 150
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.14479
Epicentral distance of station farthest from the epicenter (degree) 0.72845
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 79079311
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-06-16 10:34:30

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 77867311
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-04-04 10:59:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.POPM.HHZ. 2020-04-04T10:44:55.02 0.3 undecidable manual S 109 70.2741 50 0.05 68
GU.MAIM.HHZ. 2020-04-04T10:44:52.34 0.6 undecidable manual S 130 59.0964 50 0.35 43
GU.CARD.HHZ. 2020-04-04T10:44:50.28 0.6 undecidable manual S 120 51.2154 50 0.39 44
GU.RNCA.HHE. 2020-04-04T10:44:47.48 0.3 undecidable manual P 287 80.8635 50 0.11 66
IV.PII.HHZ. 2020-04-04T10:44:46.83 0.3 undecidable manual P 141 76.368 50 0.14 66
MN.VLC.HHZ. 2020-04-04T10:44:45.97 0.3 undecidable manual S 107 38.2284 50 -0.45 66
GU.POPM.HHZ. 2020-04-04T10:44:45.69 0.3 undecidable manual P 109 70.2741 50 -0.05 68
GU.MAIM.HHZ. 2020-04-04T10:44:44.37 0.3 undecidable manual P 130 59.0964 50 0.35 65
GU.GORR.HHN. 2020-04-04T10:44:44.76 0.3 undecidable manual P 308 63.2922 50 0.08 68
GU.CARD.HHZ. 2020-04-04T10:44:42.67 0.3 undecidable manual P 120 51.2154 50 -0.14 69
GU.EQUI.HHZ. 2020-04-04T10:44:41.03 0.3 undecidable manual S 120 20.7681 112 0.12 73
MN.VLC.HHZ. 2020-04-04T10:44:40.37 0.3 undecidable manual P 107 38.2284 50 -0.44 66
GU.MASSA.EHE. 2020-04-04T10:44:39.12 0.3 undecidable manual P 151 31.0467 105 -0.47 67
GU.FIVI.HNZ. 2020-04-04T10:44:39.74 0.6 undecidable manual S 98 16.0728 117 0.3 47
GU.EQUI.HHZ. 2020-04-04T10:44:37.63 0.1 undecidable manual P 120 20.7681 112 0 100
GU.FIVI.HNZ. 2020-04-04T10:44:36.77 0.3 undecidable manual P 98 16.0728 117 -0.01 76
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
MN.VLC.HHN. ML:1.4 0.00009047981999999999 0.2368 AML other m 2020-04-04T10:44:46.42
MN.VLC.HNN. ML:1.5 0.000108575195 0.3776 AML other m 2020-04-04T10:44:46.42
MN.VLC.HNE. ML:1.3 0.00007030898499999999 0.3776 AML other m 2020-04-04T10:44:48.61
MN.VLC.HHE. ML:1.4 0.000089872755 1.3408 AML other m 2020-04-04T10:44:49.21
GU.CARD.HHN. ML:1.7 0.00012222705 0.16 AML other m 2020-04-04T10:44:51.14
GU.CARD.HHE. ML:1.6 0.00011213355999999999 0.1216 AML other m 2020-04-04T10:44:55.77
GU.POPM.HHN. ML:1.7 0.00008761355 0.1792 AML other m 2020-04-04T10:44:56.62
GU.POPM.HHE. ML:1.7 0.00008238454500000001 0.1792 AML other m 2020-04-04T10:44:56.80
IV.PII.HHE. ML:1.6 0.00006216564 1.7952 AML other m 2020-04-04T10:45:02.04
IV.PII.HHN. ML:1.6 0.000059542895 0.256 AML other m 2020-04-04T10:45:03.84
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