Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 27-04-2020 and time 00:59:53 (Italy) in region 3 km W Monteverdi Marittimo (PI)

A magnitude ML 1.6 earthquake occured in region: 3 km W Monteverdi Marittimo (PI), on

  • 26-04-2020 22:59:53 (UTC)
  • 27-04-2020 00:59:53 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.1920, 10.6820 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.

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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
Monteverdi Marittimo PI 3 758 758
Castagneto Carducci LI 7 9010 9768
Sassetta LI 8 514 10282
Bibbona LI 11 3175 13457
Suvereto LI 12 3072 16529
Casale Marittimo PI 13 1122 17651
Guardistallo PI 14 1234 18885
Monterotondo Marittimo GR 15 1371 20256
San Vincenzo LI 15 6911 27167
Campiglia Marittima LI 16 13218 40385
Montescudaio PI 16 2144 42529
Castelnuovo di Val di Cecina PI 18 2231 44760
Cecina LI 19 28046 72806
Pomarance PI 20 5897 78703

Municipalities with at least 50000 inhabitants

An earthquake occurred to
50 Km SE of Livorno (159219 inhabitants)
55 Km W of Siena (53903 inhabitants)
59 Km NW of Grosseto (82087 inhabitants)
63 Km SE of Pisa (89158 inhabitants)
74 Km S of Lucca (89046 inhabitants)
75 Km SW of Scandicci (50609 inhabitants)
79 Km SW of Firenze (382808 inhabitants)
83 Km SE of Viareggio (62467 inhabitants)
84 Km SW of Prato (191150 inhabitants)
85 Km S of Pistoia (90315 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 2020-04-26
22:59:53		 43.1917 10.6825 9 2020-07-18
21:08:41		 Bollettino Sismico Italiano INGV 80520131
Reviewed
Rev100 		ML 1.8 2020-04-26
22:59:53		 43.1912 10.6832 9 2020-04-26
23:13:18		 Sala Sismica INGV-Roma 78610881
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-04-26 22:59:53 ± 0.12
Latitude 43.1917 ± 0.0072
Longitude 10.6825 ± 0.0099
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 80520131

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 865
Semi-minor axis of confidence ellipse (meter) 513
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 44
Circular confidence region, given by single value of horizontal uncertainty (meter) 870.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 91
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) 0.34
Epicentral distance of station closest to the epicenter (degree) 0.08364
Epicentral distance of station farthest from the epicenter (degree) 0.83097
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 13
Type of magnitude ML
Reference to an origin 80520131
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-06-26 09:58:52

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 78610881
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-04-26 23:13:18
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
Z3.A317A.HHE. 2020-04-26T23:00:15.69 0.3 undecidable manual S 257 69.7746 50 0.41 63
IV.CSNT.HHZ. 2020-04-26T23:00:12.48 0.3 undecidable manual S 57 58.0974 50 0.32 66
IV.PII.HHZ. 2020-04-26T23:00:11.96 0.3 undecidable manual S 348 60.1953 50 -0.74 57
IV.MAON.HHZ. 2020-04-26T23:00:09.91 0.6 undecidable manual P 157 92.241 50 0.27 41
IV.CASP.HHZ. 2020-04-26T23:00:08.33 0.3 undecidable manual S 162 46.9197 50 -0.83 57
IV.RIBO.EHZ.01 2020-04-26T23:00:07.28 0.3 undecidable manual S 132 39.9267 50 -0.02 72
Z3.A317A.HHE. 2020-04-26T23:00:06.58 0.3 undecidable manual P 257 69.7746 50 0.4 63
IV.CSNT.HHZ. 2020-04-26T23:00:05.17 0.6 undecidable manual P 57 58.0974 50 0.79 38
IV.PII.HHZ. 2020-04-26T23:00:04.62 0.3 undecidable manual P 348 60.1953 50 -0.08 69
IV.CELB.HHE. 2020-04-26T23:00:04.81 0.3 undecidable manual P 218 62.493 50 -0.24 66
IV.CASP.HHZ. 2020-04-26T23:00:02.50 0.6 undecidable manual P 162 46.9197 50 -0.15 46
IV.TRIF.CHZ. 2020-04-26T23:00:01.13 0.3 undecidable manual S 116 19.7691 115 -0.18 73
IV.RIBO.EHZ.01 2020-04-26T23:00:01.67 0.3 undecidable manual P 132 39.9267 50 0.09 71
IV.TRIF.CHZ. 2020-04-26T22:59:58.36 0.1 negative manual P 116 19.7691 115 0.24 95
IV.MAGO.CHZ. 2020-04-26T22:59:57.96 0.3 undecidable manual S 348 9.2796 135 -0.31 72
IV.MAGO.CHZ. 2020-04-26T22:59:56.47 0.1 negative manual P 348 9.2796 135 0.1 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CASP.HHE. ML:0.0 0.00023442675000000002 0.2432 AML other m 2020-04-26T23:00:11.59
IV.CASP.HHN. ML:0.0 0.00011925615000000001 0.1024 AML other m 2020-04-26T23:00:11.76
IV.MAGO.CHE. ML:2.0 0.0012858771500000002 0.0896 AML other m 2020-04-26T22:59:58.84
IV.TRIF.CHE. ML:1.5 0.00025118385 0.0768 AML other m 2020-04-26T23:00:02.08
IV.TRIF.CHN. ML:1.6 0.00033773485000000003 0.1664 AML other m 2020-04-26T23:00:01.60
IV.RIBO.EHE.01 ML:1.9 0.00026824245 0.1792 AML other m 2020-04-26T23:00:07.67
IV.PII.HHE. ML:1.2 0.000036595385000000004 0.2304 AML other m 2020-04-26T23:00:12.36
IV.PII.HHN. ML:1.2 0.000036253994999999995 0.32 AML other m 2020-04-26T23:00:13.84
IV.CSNT.HHN. ML:1.1 0.00002860549 0.192 AML other m 2020-04-26T23:00:13.08
IV.MAON.HHE. ML:1.6 0.00004012588 0.384 AML other m 2020-04-26T23:00:23.78
IV.MAON.HHN. ML:1.7 0.000055476515000000004 0.2688 AML other m 2020-04-26T23:00:23.11
IV.MAGO.CHN. ML:2.2 0.002021203 0.0768 AML other m 2020-04-26T22:59:58.20
IV.CSNT.HHE. ML:0.8 0.000014796815 0.1792 AML other m 2020-04-26T23:00:12.82
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