Earthquake with magnitude of ML 2.0 on date 16-09-2021 and time 00:02:30 (Italy) in region 2 km E Montieri (GR)

A magnitude ML 2.0 earthquake occured in region: 2 km E Montieri (GR), on

  • 15-09-2021 22:02:30 (UTC)
  • 16-09-2021 00:02:30 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.128, 11.037 at 9 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.

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 2 1204 1204
Chiusdino SI 5 1903 3107
Monticiano SI 12 1571 4678
Castelnuovo di Val di Cecina PI 14 2231 6909
Monterotondo Marittimo GR 15 1371 8280
Massa Marittima GR 15 8375 16655
Radicondoli SI 15 914 17569
Roccastrada GR 17 9199 26768

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km SW of Siena (53903 inhabitants)
41 Km N of Grosseto (82087 inhabitants)
71 Km S of Scandicci (50609 inhabitants)
74 Km S of Firenze (382808 inhabitants)
75 Km SE of Livorno (159219 inhabitants)
78 Km W of Arezzo (99543 inhabitants)
83 Km SE of Pisa (89158 inhabitants)
84 Km S of Prato (191150 inhabitants)
90 Km S of Pistoia (90315 inhabitants)
91 Km SE of Lucca (89046 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy ( that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
ML 2.0 2021-09-15
43.1283 11.0368 9 2021-09-15
Sala Sismica INGV-Roma 95481171
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2021-09-15 22:02:30 ± 0.11
Latitude 43.1283 ± 0.0054
Longitude 11.0368 ± 0.0111
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95481171


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 868
Semi-minor axis of confidence ellipse (meter) 292
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 282
Circular confidence region, given by single value of horizontal uncertainty (meter) 870
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 75
Number of associated phases, regardless of their use for origin computation 39
Number of defining phases 29
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.38
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 1.0657
Number of stations at which the event was observed 31
Number of stations from which data was used for origin computation 21
Magnitude information


Field Value
Value 2
Uncertainty 0.4
Num. used stations 55
Type of magnitude ML
Reference to an origin 95481171
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-15 22:10:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.VIVA.HHZ. 2021-09-15T22:03:03.70 3.0 positive manual Pn 0.86 0
IV.ATFO.HHZ. 2021-09-15T22:02:52.25 3.0 undecidable manual P -0.37 0
IV.LMD.HHZ. 2021-09-15T22:02:51.32 0.3 undecidable manual P 27 1.0657 50 0.58 71
IV.PARC.HHZ. 2021-09-15T22:02:50.76 3.0 negative manual P 0.02 0
IV.SFI.EHZ. 2021-09-15T22:02:49.88 3.0 negative manual P 0.04 0
IV.SEI.HHZ. 2021-09-15T22:02:49.64 0.3 undecidable manual P 14 0.9542 50 0.81 67
IV.BDI.HHZ. 2021-09-15T22:02:49.92 0.3 undecidable manual P 341 0.9875 50 0.52 74
GU.POPM.HHZ. 2021-09-15T22:02:49.06 0.3 undecidable manual P 348 0.938 50 0.5 76
IV.SSP9.EHZ. 2021-09-15T22:02:48.93 3.0 negative manual P 0.12 0
IV.CRE.HHZ. 2021-09-15T22:02:47.48 3.0 negative manual P 0.3 0
IV.MGAB.HHZ. 2021-09-15T22:02:47.07 3.0 undecidable manual P -0.11 0
IV.ASQU.HHZ. 2021-09-15T22:02:47.95 3.0 negative manual P 0.15 0
IV.BOSL.HHZ. 2021-09-15T22:02:47.09 0.3 undecidable manual P 17 0.8391 50 0.24 82
GU.MAIM.HHZ. 2021-09-15T22:02:47.85 0.3 undecidable manual P 333 0.8786 50 0.32 80
IV.MPPT.EHZ. 2021-09-15T22:02:46.92 0.3 undecidable manual P 3 0.8301 50 0.22 83
IV.RUFI.EHZ. 2021-09-15T22:02:46.36 0.3 undecidable manual P 26 0.7878 50 0.37 81
IV.CELB.HHZ. 2021-09-15T22:02:45.43 0.3 undecidable manual P 238 0.715 50 0.69 74
IV.OSSC.HHZ. 2021-09-15T22:02:45.56 0.3 undecidable manual S 21 0.4236 50 -0.72 78
IV.ARCI.HHZ. 2021-09-15T22:02:45.56 0.6 undecidable manual S 131 0.4227 50 -0.71 52
IV.CSNT.HHZ. 2021-09-15T22:02:44.33 0.6 undecidable manual S 28 0.3912 50 -0.99 46
IV.PII.HHZ. 2021-09-15T22:02:44.74 0.3 undecidable manual P 328 0.6997 50 0.25 84
IV.SACS.HHZ. 2021-09-15T22:02:44.99 3.0 undecidable manual P -0.01 0
IV.CAFI.HHZ. 2021-09-15T22:02:44.87 3.0 negative manual P -0.18 0
IV.CASP.HHZ. 2021-09-15T22:02:43.70 0.3 undecidable manual S 200 0.3597 50 -0.7 79
IV.CRMI.HHZ. 2021-09-15T22:02:43.90 0.3 undecidable manual P 356 0.6682 50 -0.04 89
IV.MCIV.CHZ. 2021-09-15T22:02:42.81 0.3 undecidable manual P 127 0.5837 50 0.31 85
TV.SF04.EHZ. 2021-09-15T22:02:42.04 0.3 undecidable manual P 122 0.5414 50 0.26 87
IV.MAGO.CHZ. 2021-09-15T22:02:41.42 0.6 undecidable manual S 298 0.3121 50 -1.55 35
IV.ARCI.HHZ. 2021-09-15T22:02:39.84 0.3 undecidable manual P 131 0.4227 50 0.09 92
IV.OSSC.HHZ. 2021-09-15T22:02:39.55 0.3 undecidable manual P 21 0.4236 50 -0.2 90
IV.CASP.HHZ. 2021-09-15T22:02:38.73 0.3 undecidable manual P 200 0.3597 50 0.06 94
IV.RIBO.EHZ.01 2021-09-15T22:02:38.30 0.6 undecidable manual S 178 0.179 115 -0.13 64
IV.CSNT.HHZ. 2021-09-15T22:02:38.88 0.3 undecidable manual P 28 0.3912 50 -0.31 89
IV.MAGO.CHZ. 2021-09-15T22:02:37.42 0.3 undecidable manual P 298 0.3121 50 -0.42 88
IV.TRIF.CHZ. 2021-09-15T22:02:35.31 0.6 undecidable manual S 262 0.0989 130 -0.47 61
IV.FROS.CHZ. 2021-09-15T22:02:35.87 0.3 undecidable manual S 47 0.1187 124 -0.54 89
IV.RIBO.EHZ.01 2021-09-15T22:02:35.46 0.3 undecidable manual P 178 0.179 115 0.24 94
IV.FROS.CHZ. 2021-09-15T22:02:34.02 0.3 undecidable manual P 47 0.1187 124 -0.03 99
IV.TRIF.CHZ. 2021-09-15T22:02:33.70 0.3 undecidable manual P 262 0.0989 130 0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHE. ML:0 0.011278988 0.192 AML other m 2021-09-15T22:02:35.94
IV.FROS.CHN. ML:0 0.008640297 0.1536 AML other m 2021-09-15T22:02:36.48
IV.TRIF.CHE. ML:2.8 0.0075226505 0.128 AML other m 2021-09-15T22:02:35.76
IV.TRIF.CHN. ML:2.7 0.006077455 0.1152 AML other m 2021-09-15T22:02:35.56
IV.MAGO.CHE. ML:0 0.0006450425 0.128 AML other m 2021-09-15T22:02:43.37
IV.MAGO.CHN. ML:0 0.00059888155 0.1024 AML other m 2021-09-15T22:02:42.38
IV.CASP.HNN. ML:2.9 0.002541653 0.1152 AML other m 2021-09-15T22:02:44.03
IV.CASP.HHE. ML:2.7 0.001699672 0.1024 AML other m 2021-09-15T22:02:44.03
IV.CASP.HHN. ML:2.8 0.002479543 0.1024 AML other m 2021-09-15T22:02:43.85
IV.CASP.HNE. ML:2.7 0.001940628 0.1408 AML other m 2021-09-15T22:02:44.24
IV.CSNT.HHN. ML:0 0.00067399785 0.2176 AML other m 2021-09-15T22:02:44.51
IV.CSNT.HHE. ML:0 0.00051701835 0.256 AML other m 2021-09-15T22:02:44.88
IV.OSSC.HHE. ML:0 0.00030033015 0.1536 AML other m 2021-09-15T22:02:46.53
IV.ARCI.HHN. ML:2.2 0.0004978965 0.2176 AML other m 2021-09-15T22:02:48.47
IV.ARCI.HNE. ML:2.4 0.0007038553 0.2048 AML other m 2021-09-15T22:02:46.39
IV.ARCI.HHE. ML:2.4 0.00073135445 0.2048 AML other m 2021-09-15T22:02:46.39
IV.OSSC.HHN. ML:0 0.00021519965 0.1152 AML other m 2021-09-15T22:02:46.26
IV.ARCI.HNN. ML:2.2 0.00045818595 0.2176 AML other m 2021-09-15T22:02:48.47
IV.MCIV.CHE. ML:2.3 0.00033980255 0.3456 AML other m 2021-09-15T22:02:53.14
IV.MCIV.CHN. ML:2.2 0.0002762916 0.192 AML other m 2021-09-15T22:02:52.90
IV.CRMI.HHN. ML:1.6 5.8094325E-5 0.1536 AML other m 2021-09-15T22:02:54.53
IV.PII.HHN. ML:2.3 0.0002948552 0.3456 AML other m 2021-09-15T22:02:54.52
IV.CRMI.HHE. ML:1.6 6.380907E-5 0.4992 AML other m 2021-09-15T22:02:53.91
IV.CELB.HHE. ML:2.4 0.0003675 0.06 AML other m 2021-09-15T22:02:55.88
IV.PII.HHE. ML:2.2 0.000209 0.36 AML other m 2021-09-15T22:02:56.46
IV.CELB.HHN. ML:2.4 0.00032030411 0.2432 AML other m 2021-09-15T22:02:57.16
IV.MPPT.EHE. ML:1.7 6.19E-5 0.58 AML other m 2021-09-15T22:02:59.72
IV.SACS.HHE. ML:1.6 5.93E-5 0.48 AML other m 2021-09-15T22:02:59.59
IV.BOSL.HHE. ML:1.8 6.535657E-5 0.1792 AML other m 2021-09-15T22:03:00.02
IV.BOSL.HHN. ML:1.8 7.49E-5 0.16 AML other m 2021-09-15T22:03:00.51
IV.CAFI.HHN. ML:1.5 4.466473E-5 0.3072 AML other m 2021-09-15T22:02:54.12
IV.MPPT.EHN. ML:1.7 6.03E-5 0.42 AML other m 2021-09-15T22:03:01.31
IV.SACS.HHN. ML:1.3 3.165097E-5 0.384 AML other m 2021-09-15T22:03:02.41
IV.MGAB.HHN. ML:1.7 5.33769E-5 0.2688 AML other m 2021-09-15T22:03:04.17
IV.ASQU.HHE. ML:1.6 4.65E-5 0.36 AML other m 2021-09-15T22:03:02.52
IV.MGAB.HHE. ML:1.6 4.8881765E-5 0.4096 AML other m 2021-09-15T22:03:03.23
IV.CRE.HHN. ML:1.9 8.91E-5 0.36 AML other m 2021-09-15T22:03:03.55
IV.CRE.HHE. ML:1.9 9.68E-5 0.3 AML other m 2021-09-15T22:03:03.71
GU.POPM.HHE. ML:2.1 0.000117 1.72 AML other m 2021-09-15T22:03:03.09
IV.BDI.HHN. ML:1.8 5.874184E-5 0.2432 AML other m 2021-09-15T22:03:04.86
GU.POPM.HHN. ML:2 0.000101095645 0.2816 AML other m 2021-09-15T22:03:04.90
IV.SFI.EHE. ML:1.8 5.05E-5 0.74 AML other m 2021-09-15T22:03:05.33
IV.ASQU.HHN. ML:1.8 5.995E-5 0.42 AML other m 2021-09-15T22:03:05.73
IV.SEI.HHE. ML:2.1 0.000122350605 0.3584 AML other m 2021-09-15T22:03:06.82
IV.LMD.HHE. ML:1.5 2.719168E-5 0.2688 AML other m 2021-09-15T22:03:12.94
IV.SEI.HHN. ML:2.4 0.0002195 0.34 AML other m 2021-09-15T22:03:08.69
IV.LMD.HHN. ML:1.7 4.161212E-5 0.3072 AML other m 2021-09-15T22:03:07.64
IV.SFI.EHN. ML:1.6 3.60269E-5 0.576 AML other m 2021-09-15T22:03:08.79
IV.BDI.HHE. ML:1.9 6.555E-5 0.38 AML other m 2021-09-15T22:03:09.91
IV.RIBO.EHE.01 ML:3 0.008575659 0.1536 AML other m 2021-09-15T22:02:38.46
TV.SF04.EHN. ML:2.8 0.001316021 0.2688 AML other m 2021-09-15T22:02:51.03
IV.RUFI.EHE. ML:1.8 6.784985E-5 0.3456 AML other m 2021-09-15T22:03:00.46
IV.RUFI.EHN. ML:1.7 6.53185805E-5 0.3584 AML other m 2021-09-15T22:03:00.15
GU.MAIM.HHN. ML:1.7 5.665354E-5 0.384 AML other m 2021-09-15T22:03:01.32
GU.MAIM.HHE. ML:1.6 4.2370755E-5 0.2304 AML other m 2021-09-15T22:03:00.61
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download
Waveforms Seismic signals in miniseed + resp format Download