Earthquake with magnitude of ML 1.8 on date 28-08-2020 and time 01:45:45 (Italy) in region Montieri (GR)

A magnitude ML 1.8 earthquake occured in region: Montieri (GR), on

  • 27-08-2020 23:45:45 (UTC)
  • 28-08-2020 01:45:45 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.13, 11.02 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Montieri GR 1 1204 1204
Chiusdino SI 6 1903 3107
Castelnuovo di Val di Cecina PI 13 2231 5338
Monticiano SI 13 1571 6909
Monterotondo Marittimo GR 14 1371 8280
Massa Marittima GR 14 8375 16655
Radicondoli SI 15 914 17569
Roccastrada GR 18 9199 26768

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km SW of Siena (53903 inhabitants)
42 Km N of Grosseto (82087 inhabitants)
71 Km S of Scandicci (50609 inhabitants)
74 Km S of Firenze (382808 inhabitants)
74 Km SE of Livorno (159219 inhabitants)
79 Km W of Arezzo (99543 inhabitants)
82 Km SE of Pisa (89158 inhabitants)
84 Km S of Prato (191150 inhabitants)
90 Km S of Pistoia (90315 inhabitants)
90 Km SE of Lucca (89046 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 2020-08-27
23:45:45
43.13 11.02 10 2020-11-19
12:37:00
Bollettino Sismico Italiano INGV 82787581
Reviewed
Rev100
ML 1.8 2020-08-27
23:45:45
43.13 11.03 10 2020-08-27
23:55:59
Sala Sismica INGV-Roma 82393901
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-27 23:45:45 ± 0.12
Latitude 43.13 ± 0.01
Longitude 11.02 ± 0.01
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 82787581

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 737
Semi-minor axis of confidence ellipse (meter) 580
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 249
Circular confidence region, given by single value of horizontal uncertainty (meter) 740
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 48
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 27
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.44
Epicentral distance of station closest to the epicenter (degree) 0.08903
Epicentral distance of station farthest from the epicenter (degree) 0.9344
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 16
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 22
Type of magnitude ML
Reference to an origin 82393901
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-27 23:55:59

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 22
Type of magnitude ML
Reference to an origin 82787581
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-09-10 10:43:09
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.RUFI.EHZ. 2020-08-27T23:46:11.69 0.6 undecidable manual S 26 0.7905 50 0.05 43
IV.PII.HHZ. 2020-08-27T23:46:08.40 0.3 undecidable manual S 329 0.6934 50 -0.35 62
GU.POPM.HHZ. 2020-08-27T23:46:03.62 0.3 undecidable manual P 348 0.9344 50 0.56 56
TV.SF04.EHZ. 2020-08-27T23:46:03.70 0.3 undecidable manual S 122 0.5513 50 -0.84 54
TV.SF01.EHZ. 2020-08-27T23:46:02.70 0.3 undecidable manual S 129 0.5072 50 -0.54 62
IV.MPPT.EHZ. 2020-08-27T23:46:01.72 0.3 undecidable manual P 3 0.8283 50 0.48 59
IV.RUFI.EHZ. 2020-08-27T23:46:01.37 0.3 undecidable manual P 26 0.7905 50 0.77 53
IV.CELB.HHZ. 2020-08-27T23:46:00.10 0.3 undecidable manual P 237 0.7069 50 0.94 50
IV.ARCI.HHZ. 2020-08-27T23:46:00.50 0.3 undecidable manual S 130 0.4326 50 -0.51 63
IV.CAFI.HHZ. 2020-08-27T23:45:59.80 0.3 undecidable manual P 74 0.715 50 0.49 60
IV.CSNT.HHZ. 2020-08-27T23:45:59.10 0.3 undecidable manual S 29 0.3939 50 -0.79 57
IV.MAON.HHZ. 2020-08-27T23:45:59.78 0.3 undecidable manual P 174 0.706 50 0.64 57
IV.PII.HHZ. 2020-08-27T23:45:59.39 0.6 undecidable manual P 329 0.6934 50 0.47 41
IV.CASP.HHZ. 2020-08-27T23:45:58.50 0.3 undecidable manual S 199 0.3579 50 -0.32 67
TV.SF04.EHZ. 2020-08-27T23:45:57.03 0.3 undecidable manual P 122 0.5513 50 0.53 61
TV.SF01.EHZ. 2020-08-27T23:45:56.12 0.3 undecidable manual P 129 0.5072 50 0.37 64
IV.MAGO.CHZ. 2020-08-27T23:45:55.90 0.3 undecidable manual S 298 0.3022 50 -1.26 47
IV.ARCI.HHZ. 2020-08-27T23:45:54.77 0.1 undecidable manual P 130 0.4326 50 0.31 88
IV.CSNT.HHZ. 2020-08-27T23:45:53.79 0.1 undecidable manual P 29 0.3939 50 -0.02 95
IV.CASP.HHZ. 2020-08-27T23:45:53.51 0.3 undecidable manual P 199 0.3579 50 0.31 67
IV.RIBO.EHZ.01 2020-08-27T23:45:52.80 0.3 undecidable manual S 175 0.1817 116 -0.52 66
IV.MAGO.CHZ. 2020-08-27T23:45:52.06 0.1 undecidable manual P 298 0.3022 50 -0.17 93
IV.RIBO.EHZ.01 2020-08-27T23:45:50.28 0.1 undecidable manual P 175 0.1817 116 0.26 94
IV.FROS.CHZ. 2020-08-27T23:45:50.80 0.6 undecidable manual S 51 0.1259 126 -0.66 42
IV.TRIF.CHZ. 2020-08-27T23:45:49.90 0.3 undecidable manual S 260 0.089 135 -0.48 68
IV.FROS.CHZ. 2020-08-27T23:45:48.94 0.1 undecidable manual P 51 0.1259 126 0 100
IV.TRIF.CHZ. 2020-08-27T23:45:48.40 0.1 undecidable manual P 260 0.089 135 0.08 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHE. ML:2.4 0.003615 0.26 AML other m 2020-08-27T23:45:50.05
IV.TRIF.CHN. ML:2.4 0.00321 1.02 AML other m 2020-08-27T23:45:50.07
IV.FROS.CHN. ML:2.2 0.001635 0.22 AML other m 2020-08-27T23:45:51.17
IV.FROS.CHE. ML:1.9 0.0008715 0.98 AML other m 2020-08-27T23:45:51.24
IV.RIBO.EHE.01 ML:2 0.0007091024 0.1664 AML other m 2020-08-27T23:45:53.44
IV.MAGO.CHN. ML:0 0.000276 0.16 AML other m 2020-08-27T23:45:56.08
IV.MAGO.CHE. ML:0 0.0001555 0.2 AML other m 2020-08-27T23:45:56.38
IV.CASP.HHE. ML:2.2 0.0005565 0.2 AML other m 2020-08-27T23:45:58.74
IV.CASP.HHN. ML:2.1 0.000448 1.72 AML other m 2020-08-27T23:45:59.87
IV.CSNT.HHN. ML:1.7 0.0001605 0.22 AML other m 2020-08-27T23:45:59.40
IV.CSNT.HHE. ML:1.4 7.98E-5 0.7 AML other m 2020-08-27T23:45:59.90
IV.ARCI.HHE. ML:1.5 7.946316E-5 0.1536 AML other m 2020-08-27T23:46:01.06
IV.ARCI.HNE. ML:1.6 0.0001089571 1.4624 AML other m 2020-08-27T23:46:01.81
IV.ARCI.HHN. ML:1.4 6.415216E-5 0.2304 AML other m 2020-08-27T23:46:01.66
TV.SF04.EHN. ML:2 0.0001855 0.42 AML other m 2020-08-27T23:46:04.21
TV.SF01.EHN. ML:1.7 0.00010485 0.18 AML other m 2020-08-27T23:46:04.54
TV.SF01.EHE. ML:1.8 0.0001342 0.36 AML other m 2020-08-27T23:46:04.54
TV.SF04.EHE. ML:2 0.000195 1.76 AML other m 2020-08-27T23:46:06.91
IV.CELB.HHN. ML:1.9 0.000111 0.52 AML other m 2020-08-27T23:46:11.63
IV.RUFI.EHE. ML:1.5 3.796275E-5 0.2432 AML other m 2020-08-27T23:46:12.51
IV.RUFI.EHN. ML:1.4 3.146876E-5 0.8704 AML other m 2020-08-27T23:46:12.50
IV.CELB.HHE. ML:1.7 6.34E-5 0.96 AML other m 2020-08-27T23:46:13.02
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download