Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 28-07-2020 and time 21:36:49 (UTC) in region 4 km SW Pomarance (PI)

A magnitude ML 1.2 earthquake occured in region: 4 km SW Pomarance (PI), on

  • 28-07-2020 21:36:49 (UTC)
  • 28-07-2020 23:36:49 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.2760, 10.8480 at 8 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Pomarance PI 4 5897 5897
Castelnuovo di Val di Cecina PI 9 2231 8128
Volterra PI 14 10519 18647
Monterotondo Marittimo GR 14 1371 20018
Montecatini Val di Cecina PI 15 1749 21767
Monteverdi Marittimo PI 15 758 22525
Radicondoli SI 16 914 23439
Casole d'Elsa SI 18 3897 27336
Guardistallo PI 18 1234 28570
Montescudaio PI 19 2144 30714
Casale Marittimo PI 19 1122 31836

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km W of Siena (53903 inhabitants)
53 Km SE of Livorno (159219 inhabitants)
60 Km SW of Scandicci (50609 inhabitants)
61 Km SE of Pisa (89158 inhabitants)
61 Km NW of Grosseto (82087 inhabitants)
64 Km SW of Firenze (382808 inhabitants)
69 Km SE of Lucca (89046 inhabitants)
70 Km S of Prato (191150 inhabitants)
73 Km S of Pistoia (90315 inhabitants)
82 Km SE of Viareggio (62467 inhabitants)
86 Km W of Arezzo (99543 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
Reviewed
Rev100 		ML 1.2 2020-07-28
21:36:49		 43.2762 10.8477 8 2020-07-28
21:42:45		 Sala Sismica INGV-Roma 81434401
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-07-28 21:36:49 ± 0.12
Latitude 43.2762 ± 0.0072
Longitude 10.8477 ± 0.0086
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 81434401

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 715
Semi-minor axis of confidence ellipse (meter) 672
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 213
Circular confidence region, given by single value of horizontal uncertainty (meter) 720.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 86
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.13850
Epicentral distance of station farthest from the epicenter (degree) 0.70507
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 9
Type of magnitude ML
Reference to an origin 81434401
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-07-28 21:42:45
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CELB.HHZ. 2020-07-28T21:37:03.59 0.3 undecidable manual P 222 78.2661 50 0.56 59
IV.CSNT.HHZ. 2020-07-28T21:37:03.10 0.3 undecidable manual S 58 41.8248 50 -0.34 67
IV.RIBO.EHZ.01 2020-07-28T21:37:02.56 0.3 undecidable manual S 156 39.7269 50 -0.31 68
IV.PII.HHZ. 2020-07-28T21:36:59.49 0.3 undecidable manual P 332 55.8996 50 -0.09 69
IV.FROS.CHZ. 2020-07-28T21:36:58.46 0.6 undecidable manual S 106 25.9518 108 -0.2 48
IV.RIBO.EHZ.01 2020-07-28T21:36:57.11 0.1 undecidable manual P 156 39.7269 50 0.02 97
IV.CSNT.HHZ. 2020-07-28T21:36:57.55 0.1 positive manual P 58 41.8248 50 0.12 94
IV.TRIF.CHZ. 2020-07-28T21:36:55.93 0.1 undecidable manual S 166 18.4704 114 -0.28 95
IV.FROS.CHZ. 2020-07-28T21:36:54.96 0.1 undecidable manual P 106 25.9518 108 0.3 93
IV.MAGO.CHZ. 2020-07-28T21:36:54.61 0.6 undecidable manual S 269 15.3735 118 -0.63 43
IV.TRIF.CHZ. 2020-07-28T21:36:53.56 0.1 undecidable manual P 166 18.4704 114 0.32 94
IV.MAGO.CHZ. 2020-07-28T21:36:52.74 0.1 positive manual P 269 15.3735 118 0.06 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MAGO.CHE. ML:0.0 0.001324786 0.0768 AML other m 2020-07-28T21:36:54.71
IV.MAGO.CHN. ML:0.0 0.0008930654499999999 0.1408 AML other m 2020-07-28T21:36:54.89
IV.TRIF.CHE. ML:1.5 0.0002411193 0.0768 AML other m 2020-07-28T21:36:56.70
IV.TRIF.CHN. ML:1.5 0.0002909337 0.128 AML other m 2020-07-28T21:36:56.70
IV.FROS.CHE. ML:1.3 0.00011365009 0.128 AML other m 2020-07-28T21:37:00.10
IV.FROS.CHN. ML:1.4 0.00013501425 0.1152 AML other m 2020-07-28T21:36:59.12
IV.RIBO.EHE.01 ML:1.1 0.00004575147 0.256 AML other m 2020-07-28T21:37:04.49
IV.CSNT.HHN. ML:0.8 0.000020746634999999998 0.1664 AML other m 2020-07-28T21:37:03.39
IV.CSNT.HHE. ML:0.8 0.00002105411 0.192 AML other m 2020-07-28T21:37:04.45
IV.PII.HHN. ML:1.1 0.000028556000000000002 0.1792 AML other m 2020-07-28T21:37:07.66
IV.PII.HHE. ML:0.9 0.000019097634999999997 0.2816 AML other m 2020-07-28T21:37:11.16
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