INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 2.1 on date 08-11-2018 and time 06:01:54 (Italy) in region 1 km S Castiglione d'Orcia (SI)

A magnitude ML 2.1 earthquake occured in region: 1 km S Castiglione d'Orcia (SI), on

  • 08-11-2018 05:01:54 (UTC)
  • 08-11-2018 06:01:54 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43, 11.61 at 10 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
Castiglione d'Orcia SI 1 2346 2346
San Quirico d'Orcia SI 7 2662 5008
Seggiano GR 9 961 5969
Pienza SI 11 2107 8076
Montalcino SI 13 5093 13169
Castel del Piano GR 13 4690 17859
Abbadia San Salvatore SI 14 6444 24303
Arcidosso GR 15 4285 28588
Radicofani SI 17 1097 29685
Piancastagnaio SI 17 4230 33915
Montepulciano SI 18 14097 48012
San Giovanni d'Asso SI 18 853 48865
Santa Fiora GR 18 2622 51487
Chianciano Terme SI 19 7105 58592
Buonconvento SI 19 3173 61765

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km SE of Siena (53903 inhabitants)
48 Km NE of Grosseto (82087 inhabitants)
57 Km SW of Arezzo (99543 inhabitants)
64 Km W of Perugia (166134 inhabitants)
76 Km NW of Viterbo (67173 inhabitants)
89 Km W of Foligno (57155 inhabitants)
91 Km SE of Firenze (382808 inhabitants)
92 Km SE of Scandicci (50609 inhabitants)
97 Km NW of Terni (111501 inhabitants)
Recent and historical Seismicity

These maps show the seismicity for different time windows. The earthquake locations reported in these maps are determined in quasi real-time by the personnel on duty in the seismic surveillance center of INGV in Rome. Note that the earthquake source parameters (hypocentral location and magnitude) are the best estimates obstained with the available data and they are adjourned as additional data become available. The source parameters obtained by the personnel on duty are then revised by the group in charge of the INGV Seismic Bulletin (Bollettino Sismico Italiano dell’INGV).

Earthquakes of the last three days (72 hours)

Earthquakes of the last three days (72 hours)

This map reports the earthquake epicenters located in the past 72 hours (3 days) from the time this page has been generated. The radius of the circle representing the earthquake on the map scales with magnitude. The color depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours). The open star shows the epicenter of the current earthquake.
Earthquakes of the last 90 days

Earthquakes of the last 90 days

This map reports the Magnitudo ≥ 1.0 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Earthquakes since 1985

Earthquakes since 1985

This map reports the Magnitudo ≥ 2.5 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2014

Earthquakes since 1000 AD until 2014

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version https://emidius.mi.ingv.it/CPTI15-DBMI15/) with estimated magnitude ≥ 5.0 since 1000 AD until 2014. The epicenters are represented by squares which sides scale with the estimated earthquake magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The open star shows 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 (http://zonesismiche.mi.ingv.it) 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.
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 100 ML 2.1 2018-11-08
05:01:54
42.99 11.61 10 2018-11-08
05:11:06
Sala Sismica INGV-Roma 62885661
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-11-08 05:01:54 ± 0.09
Latitude 42.99 ± 0.01
Longitude 11.61 ± 0.01
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 62885661

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 636
Semi-minor axis of confidence ellipse (meter) 630
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 209
Circular confidence region, given by single value of horizontal uncertainty (meter) 640
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 90
Number of associated phases, regardless of their use for origin computation 31
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.59265
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 15
Magnitude information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.2
Num. used stations 24
Type of magnitude ML
Reference to an origin 62885661
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-11-08 05:11:06
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MTCR.EHZ. 2018-11-08T05:02:16.50 3.0 undecidable manual P 0.77 0
IV.ASQU.HHZ. 2018-11-08T05:02:11.37 3.0 negative manual P 1.12 0
IV.CRMI.HHZ. 2018-11-08T05:02:11.23 3.0 undecidable manual P -1.03 0
IV.PIEI.HHZ. 2018-11-08T05:02:11.94 3.0 positive manual P 0.47 0
IV.PARC.HHZ. 2018-11-08T05:02:10.27 3.0 positive manual P 0.15 0
IV.MURB.HHZ. 2018-11-08T05:02:09.34 3.0 negative manual P 0.42 0
IV.FROS.HHZ. 2018-11-08T05:02:08.56 1.0 undecidable manual S 303 0.3975 50 -0.22 24
IV.MAON.HHZ. 2018-11-08T05:02:08.00 3.0 negative manual P -0.22 0
IV.CRE.HHZ. 2018-11-08T05:02:07.83 3.0 negative manual P 0.13 0
IV.TRIF.HHZ. 2018-11-08T05:02:05.27 1.0 undecidable manual P 283 0.5333 50 0.24 23
IV.ATTE.HHZ. 2018-11-08T05:02:05.91 1.0 undecidable manual P 69 0.5765 50 0.14 23
IV.OSSC.HHZ. 2018-11-08T05:02:05.91 0.6 negative manual P 333 0.5927 50 -0.14 46
IV.CSNT.HHZ. 2018-11-08T05:02:04.77 0.1 negative manual P 334 0.5333 50 -0.26 91
IV.RIBO.EHZ.01 2018-11-08T05:02:03.35 0.1 undecidable manual P 264 0.4173 50 0.3 92
IV.CAFI.HHZ. 2018-11-08T05:02:03.01 0.6 undecidable manual P 37 0.4218 50 -0.11 48
IV.MCIV.HHZ. 2018-11-08T05:02:03.56 1.0 undecidable manual S 168 0.2203 50 0.01 25
IV.LATE.HHZ. 2018-11-08T05:02:03.39 3.0 positive manual P -0.16 0
IV.ARCI.HHZ. 2018-11-08T05:02:02.10 0.6 undecidable manual S 215 0.1754 118 0.07 51
IV.FROS.HHZ. 2018-11-08T05:02:02.61 0.1 undecidable manual P 303 0.3975 50 -0.09 97
TV.SF01.EHZ. 2018-11-08T05:02:02.07 0.6 undecidable manual S 191 0.1862 117 -0.35 48
TV.SF04.EHZ. 2018-11-08T05:02:01.24 0.6 undecidable manual S 168 0.1628 120 -0.37 48
TV.SF13.HHE. 2018-11-08T05:02:01.72 0.3 undecidable manual S 179 0.1763 118 -0.35 72
TV.SF11.HHE. 2018-11-08T05:02:00.46 0.6 undecidable manual S 159 0.1349 125 -0.24 49
TV.SF03.EHN. 2018-11-08T05:01:59.51 0.1 undecidable manual P 165 0.1988 115 0.23 98
IV.MCIV.HHZ. 2018-11-08T05:01:59.89 0.1 positive manual P 168 0.2203 50 0.21 98
TV.SF13.HHE. 2018-11-08T05:01:59.03 0.1 undecidable manual P 179 0.1763 118 0.2 99
TV.SF14.HHE. 2018-11-08T05:01:59.70 0.1 undecidable manual P 180 0.2392 50 -0.3 96
TV.SF01.EHZ. 2018-11-08T05:01:59.16 0.1 positive manual P 191 0.1862 117 0.13 100
IV.ARCI.HHZ. 2018-11-08T05:01:58.79 0.6 undecidable manual P 215 0.1754 118 -0.01 51
TV.SF11.HHE. 2018-11-08T05:01:58.28 0.6 undecidable manual P 159 0.1349 125 0.24 49
TV.SF04.EHZ. 2018-11-08T05:01:58.77 0.1 positive manual P 168 0.1628 120 0.21 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PIEI.HHN. ML:1.9 7.935E-5 1.52 AML other m 2018-11-08T05:02:30.81
TV.SF04.EHE. ML:2.8 0.00468 0.6 AML other m 2018-11-08T05:02:02.53
IV.ARCI.HHN. ML:2.4 0.002025 0.22 AML other m 2018-11-08T05:02:02.49
IV.ARCI.HHE. ML:2.2 0.00132 1 AML other m 2018-11-08T05:02:02.98
TV.SF01.EHN. ML:2.1 0.002365 0.62 AML other m 2018-11-08T05:02:04.90
IV.MCIV.HHN. ML:2.2 0.001065 0.68 AML other m 2018-11-08T05:02:05.15
IV.MCIV.HHE. ML:2.3 0.001245 0.66 AML other m 2018-11-08T05:02:05.59
TV.SF01.EHE. ML:2.2 0.002585 1.38 AML other m 2018-11-08T05:02:07.21
IV.FROS.HHN. ML:2.4 0.000719 1.14 AML other m 2018-11-08T05:02:09.14
IV.LATE.HHE. ML:1.9 0.0002585 0.22 AML other m 2018-11-08T05:02:10.14
IV.FROS.HHE. ML:2.3 0.000668 1.54 AML other m 2018-11-08T05:02:10.22
IV.CSNT.HHE. ML:2 0.000204 0.56 AML other m 2018-11-08T05:02:13.44
IV.CSNT.HHN. ML:2 0.0002005 0.94 AML other m 2018-11-08T05:02:13.74
IV.LATE.HHN. ML:2 0.000286 0.32 AML other m 2018-11-08T05:02:14.13
IV.OSSC.HHE. ML:1.9 0.0001345 1.64 AML other m 2018-11-08T05:02:16.04
IV.TRIF.HHN. ML:2.2 0.000347 0.34 AML other m 2018-11-08T05:02:16.29
IV.TRIF.HHE. ML:2.2 0.0003165 0.22 AML other m 2018-11-08T05:02:16.80
IV.ATTE.HHN. ML:2 0.0001865 0.42 AML other m 2018-11-08T05:02:17.65
IV.OSSC.HHN. ML:1.8 0.0001225 1.16 AML other m 2018-11-08T05:02:17.99
IV.ATTE.HHE. ML:2.1 0.0002485 0.9 AML other m 2018-11-08T05:02:18.78
IV.CRE.HHN. ML:2 0.000162 0.26 AML other m 2018-11-08T05:02:21.54
IV.MURB.HNN. ML:2.9 0.0010195 0.26 AML other m 2018-11-08T05:02:22.33
IV.MURB.HHN. ML:2.9 0.00106 0.28 AML other m 2018-11-08T05:02:22.33
IV.CRE.HHE. ML:2 0.0001345 0.6 AML other m 2018-11-08T05:02:22.38
IV.MURB.HHE. ML:2.7 0.000715 0.26 AML other m 2018-11-08T05:02:22.70
IV.MURB.HNE. ML:2.7 0.00066 0.26 AML other m 2018-11-08T05:02:22.71
IV.ASQU.HHE. ML:2.2 0.000193 1.68 AML other m 2018-11-08T05:02:23.05
IV.ASQU.HHN. ML:2.1 0.0001345 0.38 AML other m 2018-11-08T05:02:26.44
IV.PARC.HHN. ML:2 0.00011025 0.68 AML other m 2018-11-08T05:02:27.99
IV.PARC.HHE. ML:1.9 0.0001008 1.6 AML other m 2018-11-08T05:02:29.07
IV.PIEI.HHE. ML:1.8 7.395E-5 1.24 AML other m 2018-11-08T05:02:30.79
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Focal Mechanisms

Focal Mechanisms

This map reports the focal mechanisms since 1977 in the region. The white and red beach ball symbols are mechanisms determined using the Regional Centroid Moment Tensor (RCMT, http://www.bo.ingv.it/RCMT) and are determined for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when there is a good source-receiver geometry of the target earthquake, the RCMT can be obtained also for earthquakes with magnitude larger than 4.0. The blue and white beach ball symbols indicate the mechanisms obtained from application of the Time Domain Moment Tensor (TDMT, http://cnt.rm.ingv.it/tdmt.html). This technique is used for M ≥ 3.5. The size of the beach ball sysmbol scales with the calculated moment magnitude, Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download
Waveforms Seismic signals in full SEED format Download