INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 2.1 on date 08-11-2018 and time 06:27:51 (Italy) in region 1 km W Castiglione d'Orcia (SI)

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

  • 08-11-2018 05:27:51 (UTC)
  • 08-11-2018 06:27:51 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43, 11.6 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 11 5093 13169
Castel del Piano GR 13 4690 17859
Abbadia San Salvatore SI 15 6444 24303
Arcidosso GR 15 4285 28588
San Giovanni d'Asso SI 17 853 29441
Radicofani SI 18 1097 30538
Montepulciano SI 18 14097 44635
Buonconvento SI 18 3173 47808
Piancastagnaio SI 18 4230 52038
Santa Fiora GR 19 2622 54660

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km SE of Siena (53903 inhabitants)
48 Km NE of Grosseto (82087 inhabitants)
57 Km SW of Arezzo (99543 inhabitants)
65 Km W of Perugia (166134 inhabitants)
77 Km NW of Viterbo (67173 inhabitants)
90 Km SE of Firenze (382808 inhabitants)
90 Km W of Foligno (57155 inhabitants)
91 Km SE of Scandicci (50609 inhabitants)
98 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
05:27:51
43 11.6 10 2018-11-08
05:37:08
Sala Sismica INGV-Roma 62887591
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-11-08 05:27:51 ± 0.15
Latitude 43.00 ± 0.01
Longitude 11.60 ± 0.01
Depth (km) 10 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 62887591

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1234
Semi-minor axis of confidence ellipse (meter) 940
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 167
Circular confidence region, given by single value of horizontal uncertainty (meter) 1230
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 120
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.6682
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 12
Magnitude information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.3
Num. used stations 29
Type of magnitude ML
Reference to an origin 62887591
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-11-08 05:37:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.FIAM.HHZ. 2018-11-08T05:28:35.73 3.0 undecidable manual S 0.13 0
IV.CSNT.HHZ. 2018-11-08T05:28:09.29 0.6 undecidable manual S 334 0.5234 50 -0.41 44
IV.MURB.HHZ. 2018-11-08T05:28:06.55 3.0 negative manual P 0.29 0
IV.FROS.HHZ. 2018-11-08T05:28:05.05 0.6 undecidable manual S 303 0.3858 50 -0.57 43
IV.MAON.HHZ. 2018-11-08T05:28:05.16 3.0 negative manual P -0.19 0
IV.CAFI.HHZ. 2018-11-08T05:28:05.95 0.6 undecidable manual S 39 0.4227 50 -0.76 40
IV.CRE.HHZ. 2018-11-08T05:28:05.26 0.3 undecidable manual P 22 0.6682 50 0.8 56
IV.RIBO.EHZ.01 2018-11-08T05:28:05.74 0.6 undecidable manual S 263 0.4083 50 -0.56 43
IV.ATPI.EHZ. 2018-11-08T05:28:05.97 3.0 undecidable manual P -0.49 0
IV.TRIF.HHZ. 2018-11-08T05:28:02.66 0.1 undecidable manual P 283 0.5225 50 0.69 80
IV.OSSC.HHZ. 2018-11-08T05:28:02.82 0.1 undecidable manual P 334 0.5828 50 -0.18 91
IV.CSNT.HHZ. 2018-11-08T05:28:01.79 0.1 undecidable manual P 334 0.5234 50 -0.19 92
IV.RIBO.EHZ.01 2018-11-08T05:28:00.33 0.3 undecidable manual P 263 0.4083 50 0.31 69
IV.LATE.HHZ. 2018-11-08T05:28:00.56 0.3 undecidable manual P 159 0.4146 50 0.43 67
IV.MCIV.HHZ. 2018-11-08T05:28:00.25 0.3 undecidable manual S 166 0.2293 111 -0.65 65
IV.CAFI.HHZ. 2018-11-08T05:28:00.26 0.1 undecidable manual P 39 0.4227 50 0 98
IV.FROS.HHZ. 2018-11-08T05:27:59.68 0.3 undecidable manual P 303 0.3858 50 0.05 73
TV.SF01.EHZ. 2018-11-08T05:27:59.50 0.6 undecidable manual S 188 0.1907 115 -0.05 51
IV.ARCI.HHZ. 2018-11-08T05:27:58.78 0.6 undecidable manual S 212 0.1754 117 -0.21 49
TV.SF04.EHZ. 2018-11-08T05:27:58.39 0.6 undecidable manual S 165 0.1709 117 -0.46 47
IV.MCIV.HHZ. 2018-11-08T05:27:56.99 0.1 undecidable manual P 166 0.2293 111 0.09 100
TV.SF01.EHZ. 2018-11-08T05:27:56.24 0.1 undecidable manual P 188 0.1907 115 0.12 100
IV.ARCI.HHZ. 2018-11-08T05:27:55.92 0.1 undecidable manual P 212 0.1754 117 0.12 100
TV.SF04.EHZ. 2018-11-08T05:27:55.94 0.1 undecidable manual P 165 0.1709 117 0.22 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARCI.HHE. ML:2.2 0.0012180255 0.2592 AML other m 2018-11-08T05:27:59.03
IV.ARCI.HHN. ML:2.4 0.002097921 0.2592 AML other m 2018-11-08T05:27:59.63
TV.SF04.EHN. ML:2.8 0.0046683815 0.16 AML other m 2018-11-08T05:27:58.59
TV.SF04.EHE. ML:2.7 0.0037110205 0.1792 AML other m 2018-11-08T05:27:59.56
TV.SF01.EHE. ML:2.5 0.0023564955 0.2176 AML other m 2018-11-08T05:28:00.21
TV.SF01.EHN. ML:2.7 0.0036875605 0.2016 AML other m 2018-11-08T05:28:00.19
IV.MCIV.HHE. ML:2.3 0.00111298645 0.2464 AML other m 2018-11-08T05:28:03.13
IV.MCIV.HHN. ML:2.2 0.0009986637 0.2304 AML other m 2018-11-08T05:28:01.47
IV.FROS.HHE. ML:2 0.0002998553 0.16 AML other m 2018-11-08T05:28:07.60
IV.FROS.HHN. ML:2 0.0003033226 0.208 AML other m 2018-11-08T05:28:08.29
IV.CAFI.HHN. ML:1.7 0.00012787985 0.2208 AML other m 2018-11-08T05:28:08.16
IV.RIBO.EHE.01 ML:2.4 0.0007239706 0.1984 AML other m 2018-11-08T05:28:07.76
IV.LATE.HHN. ML:1.9 0.0002225027 0.48 AML other m 2018-11-08T05:28:15.79
IV.LATE.HHE. ML:1.8 0.000206105 0.32 AML other m 2018-11-08T05:28:08.97
IV.TRIF.HHE. ML:2 0.00021772305 0.256 AML other m 2018-11-08T05:28:14.13
IV.TRIF.HHN. ML:2 0.0002394341 0.2944 AML other m 2018-11-08T05:28:13.40
IV.OSSC.HHN. ML:1.9 0.00015829425 0.32 AML other m 2018-11-08T05:28:12.90
IV.OSSC.HNE. ML:1.9 0.0001590083 0.3392 AML other m 2018-11-08T05:28:12.90
IV.OSSC.HNN. ML:2 0.00019123355 0.3808 AML other m 2018-11-08T05:28:13.34
IV.OSSC.HHE. ML:1.8 0.00012992357 0.1824 AML other m 2018-11-08T05:28:13.09
IV.MAON.HHN. ML:1.8 9.174135E-5 1.2992 AML other m 2018-11-08T05:28:25.41
IV.CRE.HHE. ML:1.9 0.000112923445 0.24 AML other m 2018-11-08T05:28:16.09
IV.CRE.HHN. ML:2.1 0.00018489215 0.24 AML other m 2018-11-08T05:28:16.23
IV.ATPI.EHE. ML:1.8 8.5065885E-5 0.4992 AML other m 2018-11-08T05:28:27.16
IV.ATPI.EHN. ML:2 0.00011756254 0.3584 AML other m 2018-11-08T05:28:22.36
IV.MURB.HHN. ML:2.8 0.0009077585 0.2816 AML other m 2018-11-08T05:28:19.65
IV.MURB.HHE. ML:2.6 0.00056849355 0.4416 AML other m 2018-11-08T05:28:21.37
IV.MURB.HNE. ML:2.6 0.0005452282 0.4192 AML other m 2018-11-08T05:28:21.37
IV.MURB.HNN. ML:2.8 0.00090800085 0.2816 AML other m 2018-11-08T05:28:19.65
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