Earthquake with magnitude of ML 2.9 on date 20-08-2011 and time 22:02:48 (Italy) in region 8 km E San Marcello Pistoiese (PT)

A magnitude ML 2.9 earthquake occured in region: 8 km E San Marcello Pistoiese (PT), on

  • 20-08-2011 20:02:48 (UTC)
  • 20-08-2011 22:02:48 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0750, 10.8930 at 4 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
San Marcello Pistoiese PT 8 6416 6416
Sambuca Pistoiese PT 9 1626 8042
Lizzano in Belvedere BO 10 2212 10254
Alto Reno Terme BO 11 6960 17214
Piteglio PT 11 1683 18897
Cutigliano PT 11 1488 20385
Gaggio Montano BO 14 4878 25263
Castel di Casio BO 15 3448 28711
Pistoia PT 16 90315 119026
Fanano MO 17 2989 122015
Cantagallo PO 18 3105 125120
Marliana PT 18 3210 128330
Montale PT 19 10737 139067
Camugnano BO 19 1885 140952
Serravalle Pistoiese PT 19 11659 152611
Abetone PT 20 621 153232
Sestola MO 20 2508 155740

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km N of Pistoia (90315 inhabitants)
27 Km NW of Prato (191150 inhabitants)
40 Km NE of Lucca (89046 inhabitants)
42 Km NW of Scandicci (50609 inhabitants)
45 Km NW of Firenze (382808 inhabitants)
56 Km NE of Pisa (89158 inhabitants)
56 Km E of Viareggio (62467 inhabitants)
59 Km SW of Bologna (386663 inhabitants)
60 Km E of Massa (69479 inhabitants)
64 Km E of Carrara (63133 inhabitants)
64 Km S of Modena (184973 inhabitants)
72 Km SE of Reggio nell'Emilia (171345 inhabitants)
73 Km W of Imola (69797 inhabitants)
75 Km NE of Livorno (159219 inhabitants)
79 Km S of Carpi (70699 inhabitants)
82 Km W of Faenza (58541 inhabitants)
85 Km E of La Spezia (93959 inhabitants)
91 Km NW of Siena (53903 inhabitants)
92 Km SE of Parma (192836 inhabitants)
93 Km W of Forlì (117913 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, https://doi.org/10.13127/cpti/cpti15.3) 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 (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
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 http://www.hsit.it. 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
Bulletin
Rev1000
ML 2.9 2011-08-20
20:02:48
44.075 10.893 4 2014-10-21
12:27:13
Bollettino Sismico Italiano INGV 1275079
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2011-08-20 20:02:48 ± 0.11
Latitude 44.0750 ± 0.0054
Longitude 10.8930 ± 0.0063
Depth (km) 4 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-SISPICK
Event type earthquake
Origin ID 1275079

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 611
Semi-minor axis of confidence ellipse (meter) 188
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 187
Circular confidence region, given by single value of horizontal uncertainty (meter) 781.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 46
Number of associated phases, regardless of their use for origin computation 98
Number of defining phases 56
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.67
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.45960
Number of stations at which the event was observed 75
Number of stations from which data was used for origin computation 38
Magnitude information

ML:2.9

Field Value
Value 2.9
Uncertainty 0.3
Num. used stations
Type of magnitude ML
Reference to an origin 1275079
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-06 01:11:28
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.APPI.EHE. 2011-08-20T20:03:58.54 10.0 undecidable manual Sn 0 0 0
IV.JOPP.HHZ. 2011-08-20T20:03:42.72 10.0 undecidable manual Pn 0 0 0
IV.VCEL.EHE. 2011-08-20T20:03:38.09 10.0 undecidable manual Sn 0 0 0
IV.ROVR.HHN. 2011-08-20T20:03:36.25 10.0 undecidable manual Sn 0 0 0
IV.TEOL.HHE. 2011-08-20T20:03:34.10 0.6 undecidable manual Sn 23 155.5221 0.501 35
IV.MONC.HHE. 2011-08-20T20:03:34.81 10.0 undecidable manual Pn 0 0 0
IV.LNSS.HHE. 2011-08-20T20:03:34.45 10.0 undecidable manual Pn 0 0 0
IV.VCEL.EHE. 2011-08-20T20:03:33.45 10.0 undecidable manual Pn 0 0 0
IV.GUMA.HHN. 2011-08-20T20:03:33.79 10.0 undecidable manual Pn 0 0 0
GU.ROTM.HHN. 2011-08-20T20:03:30.67 10.0 undecidable manual Pn 0 0 0
IV.BLLA.EHE. 2011-08-20T20:03:30.15 10.0 undecidable manual Pn 0 0 0
IV.VARE.HHE. 2011-08-20T20:03:29.00 10.0 undecidable manual Pn 0 0 0
IV.APPI.EHE. 2011-08-20T20:03:28.12 10.0 undecidable manual Pn 0 0 0
IV.PESA.HHN. 2011-08-20T20:03:27.03 10.0 undecidable manual Pn 0 0 0
IV.SMA1.EHZ. 2011-08-20T20:03:26.45 10.0 undecidable manual Pn 0 0 0
IV.ATMC.EHZ. 2011-08-20T20:03:26.63 0.6 undecidable manual Sg 123 125.2746 1.09 29
IV.CESX.HHE. 2011-08-20T20:03:26.85 10.0 undecidable manual Pn 0 0 0
IV.SENI.EHN. 2011-08-20T20:03:25.21 10.0 undecidable manual Pn 0 0 0
IV.CING.HHE. 2011-08-20T20:03:23.03 10.0 undecidable manual Pn 0 0 0
IV.CESI.HHN. 2011-08-20T20:03:23.84 10.0 undecidable manual Pn 0 0 0
GU.SC2M.HHE. 2011-08-20T20:03:22.74 0.3 undecidable manual Sg 289 113.997 0.22 62
GU.FINB.HHN. 2011-08-20T20:03:22.13 10.0 undecidable manual Pn 0 0 0
IV.SALO.HHZ. 2011-08-20T20:03:21.64 10.0 undecidable manual Sn 0 0 0
IV.CTL8.EHE. 2011-08-20T20:03:21.64 10.0 undecidable manual Sn 0 0 0
IV.TRIF.HHZ. 2011-08-20T20:03:21.58 0.3 undecidable manual Sg 180 106.5156 1.058 46
IV.MAGA.HHN. 2011-08-20T20:03:21.93 10.0 undecidable manual Pn 0 0 0
IV.FROS.HHE. 2011-08-20T20:03:19.07 0.3 undecidable manual Sg 167 98.2239 0.747 54
IV.CTL8.EHE. 2011-08-20T20:03:18.34 10.0 undecidable manual Pn 0 0 0
IV.CRE.HHN. 2011-08-20T20:03:18.42 0.6 undecidable manual Sg 120 98.6235 -0.011 44
GU.RORO.HHE. 2011-08-20T20:03:17.51 10.0 undecidable manual Pn 0 0 0
IV.SALO.HHZ. 2011-08-20T20:03:17.95 10.0 undecidable manual Pn 0 0 0
IV.PIEI.HHE. 2011-08-20T20:03:17.86 10.0 undecidable manual Pn 0 0 0
IV.FSSB.HHN. 2011-08-20T20:03:16.37 10.0 undecidable manual Pn 0 0 0
IV.SSFR.HHE. 2011-08-20T20:03:16.46 10.0 undecidable manual Pn 0 0 0
IV.ARCI.HHN. 2011-08-20T20:03:16.31 10.0 undecidable manual Pn 0 0 0
IV.SASS.HHN. 2011-08-20T20:03:16.53 0.6 undecidable manual Sg 190 92.0412 -0.133 44
IV.ATVO.HHE. 2011-08-20T20:03:16.37 10.0 undecidable manual Pn 0 0 0
IV.SACS.HHZ. 2011-08-20T20:03:16.04 10.0 undecidable manual Pn 0 0 0
IV.ROVR.HHN. 2011-08-20T20:03:16.79 10.0 undecidable manual Pn 0 0 0
IV.MURB.HHN. 2011-08-20T20:03:15.02 10.0 undecidable manual Pn 0 0 0
IV.ATCC.EHZ. 2011-08-20T20:03:14.32 10.0 undecidable manual Pg 0 0 0
IV.FRON.EHE. 2011-08-20T20:03:14.39 0.3 undecidable manual Pg 112 159.2184 -0.54 51
IV.MGAB.HHN. 2011-08-20T20:03:14.15 0.1 undecidable manual Pg 142 162.0156 -1.208 50
IV.MABI.HHE. 2011-08-20T20:03:14.35 10.0 undecidable manual Pg 0 0 0
IV.TEOL.HHE. 2011-08-20T20:03:14.89 0.6 undecidable manual Pg 23 155.5221 0.539 34
IV.SBPO.HHZ. 2011-08-20T20:03:13.40 10.0 undecidable manual Pg 0 0 0
IV.PLMA.HHN. 2011-08-20T20:03:13.37 0.3 undecidable manual Sg 268 82.8504 -0.851 54
IV.MPAG.EHE. 2011-08-20T20:03:13.94 0.3 undecidable manual Pg 108 157.3203 -0.693 48
IV.SFI.EHN. 2011-08-20T20:03:12.58 0.3 undecidable manual Sg 104 78.4659 -0.462 63
IV.BOB.HHZ. 2011-08-20T20:03:12.92 0.3 undecidable manual Pg 304 137.9619 1.279 39
IV.CASP.HHZ. 2011-08-20T20:03:12.73 10.0 undecidable manual Pg 0 0 0
IV.ATPC.HHE. 2011-08-20T20:03:11.59 0.3 undecidable manual Pg 117 141.5472 -0.612 52
IV.CSNT.HHZ. 2011-08-20T20:03:11.57 0.3 undecidable manual Sg 154 73.9704 -0.262 66
IV.ATMC.EHZ. 2011-08-20T20:03:09.31 0.3 undecidable manual Pg 123 125.2746 -0.387 58
IV.BADI.EHZ. 2011-08-20T20:03:09.28 0.3 undecidable manual Pg 120 125.0859 -0.383 58
IV.CPGN.EHZ. 2011-08-20T20:03:09.04 0.1 undecidable manual Pg 104 117.993 0.461 77
IV.TERO.HHN. 2011-08-20T20:03:08.88 10.0 undecidable manual Pg 0 0 0
IV.CAFI.HHE. 2011-08-20T20:03:08.09 0.3 undecidable manual Pg 133 119.3916 -0.693 53
GU.SC2M.HHE. 2011-08-20T20:03:08.25 0.3 undecidable manual Pg 289 113.997 0.295 61
IV.PARC.HHN. 2011-08-20T20:03:07.86 0.3 undecidable manual Pg 113 117.5934 -0.648 54
IV.TRIF.HHZ. 2011-08-20T20:03:07.45 0.3 undecidable manual Pg 180 106.5156 0.654 55
IV.MSSA.HHE. 2011-08-20T20:03:07.60 0.3 undecidable manual Pg 284 112.5984 -0.143 63
MN.CUC.HHN. 2011-08-20T20:03:07.26 10.0 undecidable manual Pg 0 0 0
IV.PRMA.HHN. 2011-08-20T20:03:07.94 10.0 undecidable manual Pg 0 0 0
CH.MMK.HHN. 2011-08-20T20:03:07.15 10.0 undecidable manual Pg 0 0 0
IV.FROS.HHE. 2011-08-20T20:03:06.17 0.3 undecidable manual Pg 167 98.2239 0.641 57
IV.GROG.HHN. 2011-08-20T20:03:06.95 0.3 undecidable manual Pg 228 107.7144 -0.038 65
IV.T0502.EHZ. 2011-08-20T20:03:06.03 0.3 undecidable manual Pg 101 101.2209 0.049 65
IV.CRE.HHN. 2011-08-20T20:03:05.29 0.3 undecidable manual Pg 120 98.6235 -0.305 62
IV.MTRZ.HHN. 2011-08-20T20:03:05.09 0.6 undecidable manual Sg 58 49.9167 -0.322 46
IV.SASS.HHN. 2011-08-20T20:03:04.87 0.3 undecidable manual Pg 190 92.0412 0.294 63
IV.RAVA.EHZ. 2011-08-20T20:03:03.36 0.3 undecidable manual Pg 13 77.6667 1.001 51
IV.NOVE.EHZ. 2011-08-20T20:03:03.83 0.6 undecidable manual Pg 350 81.4518 0.882 35
IV.FIU.EHN. 2011-08-20T20:03:03.60 0.3 undecidable manual Pg 37 78.6657 1.083 48
IV.CSNT.HHZ. 2011-08-20T20:03:02.09 0.3 undecidable manual Pg 154 73.9704 0.311 65
IV.PLMA.HHN. 2011-08-20T20:03:02.77 0.1 undecidable manual Pg 268 82.8504 -0.387 84
IV.ASQU.HHZ. 2011-08-20T20:03:02.26 0.1 undecidable manual Pg 113 77.9664 -0.149 90
IV.IMOL.EHZ. 2011-08-20T20:03:02.85 0.3 undecidable manual Pg 65 74.5698 0.967 52
IV.SFI.EHN. 2011-08-20T20:03:02.27 0.3 undecidable manual Pg 104 78.4659 -0.207 66
MN.VLC.HHN. 2011-08-20T20:03:01.40 0.6 undecidable manual Sg 283 41.4252 -1.087 35
GU.MAIM.HHN. 2011-08-20T20:03:00.28 0.3 undecidable manual Sg 241 36.6411 -0.557 66
IV.CRMI.HHE. 2011-08-20T20:02:59.75 0.3 undecidable manual Sg 169 32.1456 0.449 69
IV.ZCCA.HHN. 2011-08-20T20:02:59.94 0.3 undecidable manual Sg 12 31.3464 0.916 57
IV.FIR.HHN. 2011-08-20T20:02:58.03 0.6 undecidable manual Pg 139 44.1225 1.099 34
IV.MTRZ.HHN. 2011-08-20T20:02:57.35 0.3 undecidable manual Pg 58 49.9167 -0.727 60
IV.VMG.SHZ. 2011-08-20T20:02:57.46 0.3 undecidable manual Pg 103 53.4021 -1.163 49
IV.BDI.HHZ. 2011-08-20T20:02:56.87 0.3 undecidable manual Sg 267 23.5542 0.508 69
GU.MAIM.HHN. 2011-08-20T20:02:55.10 0.1 undecidable manual Pg 241 36.6411 -0.334 93
IV.FNVD.HHZ. 2011-08-20T20:02:55.16 0.3 undecidable manual Sg 61 21.0678 -0.328 72
MN.VLC.HHN. 2011-08-20T20:02:55.59 0.1 undecidable manual Pg 283 41.4252 -0.793 79
IV.PTF.SHZ. 2011-08-20T20:02:55.18 0.6 undecidable manual Sg 132 18.9699 0.408 47
IV.SEI.SHZ. 2011-08-20T20:02:54.78 0.1 undecidable manual Pg 93 37.2294 -0.769 80
IV.CRMI.HHE. 2011-08-20T20:02:54.85 0.1 undecidable manual Pg 169 32.1456 0.303 94
IV.ZCCA.HHN. 2011-08-20T20:02:54.36 0.1 undecidable manual Pg 12 31.3464 -0.027 100
IV.BDI.HHZ. 2011-08-20T20:02:53.07 0.1 undecidable manual Pg 267 23.5542 0.221 97
IV.FDMO.HHN. 2011-08-20T20:02:53.56 10.0 undecidable manual Pg 0 0 0
IV.FNVD.HHZ. 2011-08-20T20:02:52.17 0.1 undecidable manual Pg 61 21.0678 -0.172 99
IV.PTF.SHZ. 2011-08-20T20:02:52.55 0.1 undecidable manual Pg 132 18.9699 0.614 88
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, http://www.bo.ingv.it/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, /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.
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 miniseed + resp format Download