Earthquake with magnitude of ML 1.2 on date 15-12-2020 and time 04:20:21 (Italy) in region 3 km NE Monterotondo Marittimo (GR)

A magnitude ML 1.2 earthquake occured in region: 3 km NE Monterotondo Marittimo (GR), on

  • 15-12-2020 03:20:21 (UTC)
  • 15-12-2020 04:20:21 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.173, 10.879 at 6 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Monterotondo Marittimo GR 3 1371 1371
Castelnuovo di Val di Cecina PI 5 2231 3602
Montieri GR 12 1204 4806
Monteverdi Marittimo PI 13 758 5564
Massa Marittima GR 14 8375 13939
Pomarance PI 14 5897 19836
Radicondoli SI 17 914 20750
Chiusdino SI 17 1903 22653
Suvereto LI 19 3072 25725
Sassetta LI 20 514 26239

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km W of Siena (53903 inhabitants)
50 Km NW of Grosseto (82087 inhabitants)
63 Km SE of Livorno (159219 inhabitants)
70 Km SW of Scandicci (50609 inhabitants)
72 Km SE of Pisa (89158 inhabitants)
73 Km SW of Firenze (382808 inhabitants)
81 Km SE of Lucca (89046 inhabitants)
81 Km S of Prato (191150 inhabitants)
85 Km S of Pistoia (90315 inhabitants)
88 Km W of Arezzo (99543 inhabitants)
92 Km SE of Viareggio (62467 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 1.2 2020-12-15
03:20:21
43.1727 10.8788 6 2021-02-26
14:56:11
Bollettino Sismico Italiano INGV 85464631
Reviewed
Rev100
ML 1.2 2020-12-15
03:20:21
43.1447 10.867 5 2020-12-15
03:29:24
Sala Sismica INGV-Roma 85436091
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-15 03:20:21 ± 0.11
Latitude 43.1727 ± 0.0063
Longitude 10.8788 ± 0.0074
Depth (km) 6 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 85464631

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 685
Semi-minor axis of confidence ellipse (meter) 303
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 214
Circular confidence region, given by single value of horizontal uncertainty (meter) 680
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 138
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.06025
Epicentral distance of station farthest from the epicenter (degree) 0.64841
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitudes information

ML:1.2

Field Value
Value 1.2
Uncertainty 0
Num. used stations 4
Type of magnitude ML
Reference to an origin 85464631
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-12-16 07:58:58

ML:1.2

Field Value
Value 1.2
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 85436091
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-15 03:29:24
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CELB.HHZ. 2020-12-15T03:20:34.62 0.3 undecidable manual P 229 0.6484 50 0.13 67
IV.RIBO.EHZ.01 2020-12-15T03:20:31.38 0.3 undecidable manual S 151 0.2545 102 -0.04 74
IV.CASP.HHE. 2020-12-15T03:20:29.70 0.1 undecidable manual P 181 0.3822 50 -0.23 92
IV.FROS.CHE. 2020-12-15T03:20:29.62 0.3 undecidable manual S 80 0.2059 105 0.05 74
IV.MAGO.CHZ. 2020-12-15T03:20:28.95 0.1 undecidable manual S 302 0.1898 107 -0.03 100
IV.RIBO.EHZ.01 2020-12-15T03:20:27.63 0.1 undecidable manual P 151 0.2545 102 0.47 90
IV.FROS.CHE. 2020-12-15T03:20:26.00 0.1 undecidable manual P 80 0.2059 105 -0.1 98
IV.MAGO.CHZ. 2020-12-15T03:20:25.87 0.1 negative manual P 302 0.1898 107 0.11 98
IV.TRIF.CHZ. 2020-12-15T03:20:24.62 0.3 undecidable manual S 163 0.0603 133 0.08 76
IV.TRIF.CHZ. 2020-12-15T03:20:22.82 0.1 undecidable manual P 163 0.0603 133 -0.38 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHN. ML:2.3 0.003145 1.48 AML other m 2020-12-15T03:20:26.91
IV.TRIF.CHE. ML:2.4 0.0040388725 0.568 AML other m 2020-12-15T03:20:26.70
IV.MAGO.CHE. ML:1.2 0.000113996 0.152 AML other m 2020-12-15T03:20:29.70
IV.MAGO.CHN. ML:1.2 0.0001109104 0.136 AML other m 2020-12-15T03:20:30.16
IV.FIR.HHN. ML:0 0.0001465 0.84 AML other m 2020-12-15T03:20:33.26
IV.CELB.HHN. ML:1.2 2.289763E-5 0.1392 AML other m 2020-12-15T03:20:44.29
IV.CELB.HHE. ML:1.1 2.028557E-5 0.6592 AML other m 2020-12-15T03:20:44.57
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