Earthquake with magnitude of ML 4.0 on date 20-10-2011 and time 08:11:18 (Italy) in region 1 km SE Rezzoaglio (GE)

A magnitude ML 4.0 earthquake occured in region: 1 km SE Rezzoaglio (GE), on

  • 20-10-2011 06:11:18 (UTC)
  • 20-10-2011 08:11:18 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.5210, 9.3930 at 5 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
Rezzoaglio GE 1 995 995
Santo Stefano d'Aveto GE 6 1126 2121
Fontanigorda GE 8 277 2398
Borzonasca GE 11 2049 4447
Rovegno GE 11 554 5001
Montebruno GE 11 240 5241
Gorreto GE 12 97 5338
Ottone PC 12 516 5854
Favale di Malvaro GE 13 466 6320
Fascia GE 13 81 6401
Lorsica GE 14 468 6869
Rondanina GE 15 62 6931
Mezzanego GE 15 1537 8468
Orero GE 16 565 9033
Ferriere PC 16 1294 10327
Propata GE 17 142 10469
Coreglia Ligure GE 17 285 10754
Neirone GE 18 916 11670
Cicagna GE 18 2502 14172
San Colombano Certenoli GE 18 2683 16855
Cerignale PC 18 127 16982
Moconesi GE 18 2614 19596
Zerba PC 18 77 19673
Torriglia GE 19 2311 21984
Tornolo PR 19 1010 22994
Bedonia PR 19 3482 26476
Carasco GE 19 3733 30209
Tribogna GE 19 614 30823
Ne GE 20 2259 33082

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km E of Genova (586655 inhabitants)
58 Km NW of La Spezia (93959 inhabitants)
64 Km SW of Piacenza (102191 inhabitants)
75 Km NW of Carrara (63133 inhabitants)
75 Km SE of Alessandria (93943 inhabitants)
76 Km E of Savona (61345 inhabitants)
76 Km S of Pavia (72576 inhabitants)
80 Km NW of Massa (69479 inhabitants)
80 Km W of Parma (192836 inhabitants)
85 Km SW of Cremona (71901 inhabitants)
98 Km SE of Vigevano (63310 inhabitants)
100 Km NW of Viareggio (62467 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

These three maps show the results of the analysis using the software ShakeMap designed to provide the level of ground shaking experienced in a region using the data recorded by seismometers and strong motion instruments and seismological information regarding the attenuation of the wavefield with distance and the site characteristics. The Shakemaps are determined for research purposes to provide fast estimates of the level of ground shaking produced by the earthquake. The maps are calculated automatically and updated as more data become available. See http://shakemap.ingv.it for additional information. The black star indicates the epicenter. The triangles show the accelerometric and velocimetric stations used in the calculation, colored according to the recorded shaking.

Intensity Shakemap

Intensity Shakemap

This map shows the distribution of instrumental intensities. The intensity is derived through an empirical law that correlates the recorded values of actual ground shaking, e.g., acceleration and velocity, with the macroseismic intensity for Italian earthquakes, as reported in the Italian Macroseismic Database (DBMI15, https://doi.org/10.13127/cpti/cpti15.3).
Peak ground acceleration Shakemap

Peak ground acceleration Shakemap

This map shows the distribution of peak ground acceleration expressed as percent of the acceleration of gravity (i.e., g = 9.81 m/s²).
Peak velocity Shakemap

Peak velocity Shakemap

This map shows the distribution of peak ground velocities expressed in cm/s.
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000
ML 4.0 2011-10-20
06:11:18
44.521 9.393 5 2014-10-21
12:27:13
Bollettino Sismico Italiano INGV 1299149
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2011-10-20 06:11:18 ± 0.18
Latitude 44.5210 ± 0.0081
Longitude 9.3930 ± 0.0101
Depth (km) 5 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-SISPICK
Event type earthquake
Origin ID 1299149

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 904
Semi-minor axis of confidence ellipse (meter) 564
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 20
Circular confidence region, given by single value of horizontal uncertainty (meter) 1204.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 97
Number of associated phases, regardless of their use for origin computation 117
Number of defining phases 27
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.53
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.43981
Number of stations at which the event was observed 103
Number of stations from which data was used for origin computation 17
Magnitude information

ML:4.0

Field Value
Value 4.0
Uncertainty 0.2
Num. used stations
Type of magnitude ML
Reference to an origin 1299149
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-06 01:45:19
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
CH.BNALP.HHE. 2011-10-20T06:12:03.04 10.0 undecidable manual Sn 0 0 0
IV.SALO.HHZ. 2011-10-20T06:12:03.15 0.6 undecidable manual Sn 36 150.5382 0.322 37
CH.EMV.HHE. 2011-10-20T06:12:02.04 10.0 undecidable manual Sn 0 0 0
IV.MCIV.HHE. 2011-10-20T06:12:02.80 10.0 undecidable manual Sn 0 0 0
IV.IMI.HHZ. 2011-10-20T06:11:58.58 0.3 undecidable manual Sn 241 137.1627 -0.666 51
IV.SMA1.EHZ. 2011-10-20T06:11:55.25 10.0 undecidable manual Sn 0 0 0
GU.RORO.HHE. 2011-10-20T06:11:52.89 0.3 undecidable manual Sn 247 114.6963 -0.356 59
GU.MAIM.HHZ. 2011-10-20T06:11:51.48 0.6 undecidable manual Sn 127 110.3118 -0.591 37
IV.SMA1.EHZ. 2011-10-20T06:11:50.81 10.0 undecidable manual Pn 0 0 0
IV.MAGA.HHZ. 2011-10-20T06:11:50.46 10.0 undecidable manual Pg 0 0 0
SI.ROSI.HHN. 2011-10-20T06:11:49.47 10.0 undecidable manual Pn 0 0 0
GU.BHB.HHZ. 2011-10-20T06:11:49.43 10.0 undecidable manual Pg 0 0 0
IV.LNSS.HHN. 2011-10-20T06:11:48.13 10.0 undecidable manual Pn 0 0 0
IV.FVI.HHE. 2011-10-20T06:11:47.95 10.0 undecidable manual Pn 0 0 0
GU.FINB.HHZ. 2011-10-20T06:11:47.64 0.3 undecidable manual Sn 246 92.8404 0.21 64
IV.MAON.HHZ. 2011-10-20T06:11:47.25 10.0 undecidable manual Pn 0 0 0
IV.FDMO.HHE. 2011-10-20T06:11:46.59 10.0 undecidable manual Pn 0 0 0
CH.PLONS.HHZ. 2011-10-20T06:11:46.29 10.0 undecidable manual Pn 0 0 0
IV.ZCCA.HHZ. 2011-10-20T06:11:45.67 10.0 undecidable manual Pg 0 0 0
IV.GUMA.HHZ. 2011-10-20T06:11:45.36 10.0 undecidable manual Pn 0 0 0
IV.QLNO.HHE. 2011-10-20T06:11:45.59 0.3 undecidable manual Sn 256 85.7475 0.052 67
GU.ENR.HHZ. 2011-10-20T06:11:45.98 0.3 undecidable manual Pg 259 159.8178 0.311 53
IV.MRB1.HHZ. 2011-10-20T06:11:45.24 10.0 undecidable manual Pn 0 0 0
GU.NEGI.HHZ. 2011-10-20T06:11:44.71 0.6 undecidable manual Pg 241 153.9348 -0.051 38
IV.CRMI.HHZ. 2011-10-20T06:11:44.37 0.6 undecidable manual Pg 122 149.4393 0.298 37
IV.SALO.HHZ. 2011-10-20T06:11:44.89 0.6 undecidable manual Pg 36 150.5382 0.644 33
IV.CESX.HHE. 2011-10-20T06:11:43.52 10.0 undecidable manual Pn 0 0 0
SI.RISI.HHZ. 2011-10-20T06:11:43.61 10.0 undecidable manual Pn 0 0 0
IV.SNTG.HHZ. 2011-10-20T06:11:42.20 10.0 undecidable manual Pn 0 0 0
IV.IMI.HHZ. 2011-10-20T06:11:42.84 0.3 undecidable manual Pg 241 137.1627 0.661 51
IV.ATCC.EHZ. 2011-10-20T06:11:41.70 10.0 undecidable manual Pn 0 0 0
IV.GROG.HHN. 2011-10-20T06:11:41.41 0.6 undecidable manual Pg 162 127.7721 0.668 35
IV.ARVD.HHZ. 2011-10-20T06:11:41.18 10.0 undecidable manual Pn 0 0 0
IV.ESLN.HHZ. 2011-10-20T06:11:41.36 10.0 undecidable manual Pn 0 0 0
IV.FRON.EHZ. 2011-10-20T06:11:41.88 10.0 undecidable manual Pn 0 0 0
IV.MCIV.HHE. 2011-10-20T06:11:41.65 10.0 undecidable manual Pn 0 0 0
SI.ABSI.HHZ. 2011-10-20T06:11:41.27 10.0 undecidable manual Pn 0 0 0
GU.PCP.HHZ. 2011-10-20T06:11:40.05 0.3 undecidable manual Sg 272 67.0773 -0.496 63
GU.RORO.HHE. 2011-10-20T06:11:39.30 0.3 undecidable manual Pg 247 114.6963 0.586 56
IV.MPAG.EHZ. 2011-10-20T06:11:38.25 10.0 undecidable manual Pn 0 0 0
IV.PLMA.HHZ. 2011-10-20T06:11:38.97 0.6 undecidable manual Sg 145 63.7917 -0.698 39
GU.MAIM.HHZ. 2011-10-20T06:11:38.68 0.3 undecidable manual Pg 127 110.3118 0.643 55
SI.KOSI.HHZ. 2011-10-20T06:11:37.24 10.0 undecidable manual Pn 0 0 0
GU.ROTM.HHZ. 2011-10-20T06:11:37.98 10.0 undecidable manual Pg 0 0 0
IV.FSSB.HHZ. 2011-10-20T06:11:37.47 10.0 undecidable manual Pn 0 0 0
CH.FUORN.HHZ. 2011-10-20T06:11:36.61 10.0 undecidable manual Pn 0 0 0
IV.ATVO.HHZ. 2011-10-20T06:11:36.49 10.0 undecidable manual Pn 0 0 0
IV.SSFR.HHE. 2011-10-20T06:11:36.61 10.0 undecidable manual Pn 0 0 0
IV.APPI.EHZ. 2011-10-20T06:11:36.04 10.0 undecidable manual Pn 0 0 0
IV.ATTE.HHZ. 2011-10-20T06:11:36.86 10.0 undecidable manual Pn 0 0 0
IV.PIEI.HHE. 2011-10-20T06:11:36.59 10.0 undecidable manual Pn 0 0 0
IV.ATPC.HHZ. 2011-10-20T06:11:35.49 10.0 undecidable manual Pn 0 0 0
CH.EMV.HHE. 2011-10-20T06:11:35.20 10.0 undecidable manual Pn 0 0 0
CH.BNALP.HHE. 2011-10-20T06:11:35.74 10.0 undecidable manual Pn 0 0 0
GU.FINB.HHZ. 2011-10-20T06:11:35.49 0.3 undecidable manual Pg 246 92.8404 0.133 65
IV.ARCI.HHZ. 2011-10-20T06:11:35.15 10.0 undecidable manual Pn 0 0 0
IV.MGAB.HHE. 2011-10-20T06:11:35.99 10.0 undecidable manual Pn 0 0 0
IV.IFIL.EHE. 2011-10-20T06:11:34.72 10.0 undecidable manual Pn 0 0 0
IV.QLNO.HHE. 2011-10-20T06:11:34.45 0.3 undecidable manual Pg 256 85.7475 0.185 65
MN.VLC.HHE. 2011-10-20T06:11:34.97 0.6 undecidable manual Pg 117 88.4448 0.299 42
IV.BADI.EHZ. 2011-10-20T06:11:34.52 10.0 undecidable manual Pn 0 0 0
IV.CPGN.EHZ. 2011-10-20T06:11:34.29 10.0 undecidable manual Pn 0 0 0
CH.DAVOX.HHZ. 2011-10-20T06:11:34.79 10.0 undecidable manual Pn 0 0 0
IV.ATMC.EHZ. 2011-10-20T06:11:33.54 10.0 undecidable manual Pn 0 0 0
IV.PRMA.HHZ. 2011-10-20T06:11:33.30 0.6 undecidable manual Pg 69 77.4669 0.322 43
IV.MURB.HHZ. 2011-10-20T06:11:33.88 10.0 undecidable manual Pn 0 0 0
CH.FUSIO.HHN. 2011-10-20T06:11:32.54 10.0 undecidable manual Pn 0 0 0
IV.MRGE.HHZ. 2011-10-20T06:11:32.13 10.0 undecidable manual Pn 0 0 0
IV.CAFI.HHZ. 2011-10-20T06:11:32.52 10.0 undecidable manual Pn 0 0 0
IV.PARC.HHZ. 2011-10-20T06:11:32.34 10.0 undecidable manual Pn 0 0 0
SI.MOSI.HHZ. 2011-10-20T06:11:31.62 10.0 undecidable manual Pg 0 0 0
GU.PCP.HHZ. 2011-10-20T06:11:31.83 0.3 undecidable manual Pg 272 67.0773 0.448 64
MN.BNI.HHZ. 2011-10-20T06:11:31.62 10.0 undecidable manual Pg 0 0 0
CH.DIX.HHN. 2011-10-20T06:11:31.96 10.0 undecidable manual Pg 0 0 0
GU.SATI.HHZ. 2011-10-20T06:11:31.76 10.0 undecidable manual Pg 0 0 0
GU.LSD.HHZ. 2011-10-20T06:11:30.79 10.0 undecidable manual Pg 0 0 0
CH.BERNI.HHZ. 2011-10-20T06:11:29.14 10.0 undecidable manual Pg 0 0 0
IV.IMOL.EHZ. 2011-10-20T06:11:29.98 10.0 undecidable manual Pg 0 0 0
IV.BRMO.HHZ. 2011-10-20T06:11:29.48 10.0 undecidable manual Pg 0 0 0
GU.RRL.HHE. 2011-10-20T06:11:29.26 10.0 undecidable manual Pg 0 0 0
IV.PLMA.HHZ. 2011-10-20T06:11:29.90 0.1 undecidable manual Pg 145 63.7917 -0.975 69
IV.SFI.EHZ. 2011-10-20T06:11:28.19 10.0 undecidable manual Pg 0 0 0
IV.SBPO.HHZ. 2011-10-20T06:11:28.75 10.0 undecidable manual Pg 0 0 0
CH.MMK.HHE. 2011-10-20T06:11:28.09 10.0 undecidable manual Pg 0 0 0
IV.ASQU.HHZ. 2011-10-20T06:11:28.35 10.0 undecidable manual Pg 0 0 0
IV.MSSA.HHZ. 2011-10-20T06:11:27.69 0.3 undecidable manual Sg 157 24.753 0.05 75
MN.TUE.HHN. 2011-10-20T06:11:27.15 10.0 undecidable manual Pg 0 0 0
IV.CASP.HHZ. 2011-10-20T06:11:27.55 10.0 undecidable manual Pg 0 0 0
GU.CIRO.HHZ. 2011-10-20T06:11:26.97 10.0 undecidable manual Pg 0 0 0
IV.FROS.HHZ. 2011-10-20T06:11:25.53 10.0 undecidable manual Pg 0 0 0
GU.SC2M.HHZ. 2011-10-20T06:11:25.57 0.3 undecidable manual Sg 139 17.0718 0.508 69
GU.RSP.HHZ. 2011-10-20T06:11:24.95 10.0 undecidable manual Pg 0 0 0
IV.MTRZ.HHZ. 2011-10-20T06:11:24.86 10.0 undecidable manual Pg 0 0 0
GU.PZZ.HHZ. 2011-10-20T06:11:23.50 10.0 undecidable manual Pg 0 0 0
IV.CSNT.HHE. 2011-10-20T06:11:23.01 10.0 undecidable manual Pg 0 0 0
IV.MABI.HHZ. 2011-10-20T06:11:23.93 10.0 undecidable manual Pg 0 0 0
IV.TRIF.HHZ. 2011-10-20T06:11:23.39 10.0 undecidable manual Pg 0 0 0
IV.CELB.HHN. 2011-10-20T06:11:23.70 10.0 undecidable manual Pg 0 0 0
IV.MSSA.HHZ. 2011-10-20T06:11:23.54 0.1 positive manual Pg 157 24.753 -0.391 93
IV.VARE.HHE. 2011-10-20T06:11:23.01 10.0 undecidable manual Pg 0 0 0
IV.BOB.HHZ. 2011-10-20T06:11:23.70 0.1 positive manual Pg 9 27.75 -0.813 80
GU.SC2M.HHZ. 2011-10-20T06:11:22.34 0.1 positive manual Pg 139 17.0718 -0.103 100
GU.TRAV.HHZ. 2011-10-20T06:11:22.76 10.0 undecidable manual Pg 0 0 0
IV.ROVR.HHE. 2011-10-20T06:11:22.25 10.0 undecidable manual Pg 0 0 0
IV.DOI.HHZ. 2011-10-20T06:11:21.68 10.0 undecidable manual Pg 0 0 0
IV.SEI.SHZ. 2011-10-20T06:11:21.31 10.0 undecidable manual Pg 0 0 0
IV.SASS.HHZ. 2011-10-20T06:11:20.35 10.0 undecidable manual Pg 0 0 0
IV.MONC.HHZ. 2011-10-20T06:11:19.37 10.0 undecidable manual Pg 0 0 0
CH.MUGIO.HHZ. 2011-10-20T06:11:19.04 10.0 undecidable manual Pg 0 0 0
IV.FNVD.HHZ. 2011-10-20T06:11:18.38 10.0 undecidable manual Pg 0 0 0
IV.RAVA.EHE. 2011-10-20T06:11:17.50 10.0 undecidable manual Pg 0 0 0
IV.PTF.SHZ. 2011-10-20T06:11:16.94 10.0 undecidable manual Pg 0 0 0
IV.BDI.HHE. 2011-10-20T06:11:14.32 10.0 undecidable manual Pg 0 0 0
IV.NOVE.EHZ. 2011-10-20T06:11:13.82 10.0 undecidable manual Pg 0 0 0
IV.CTL8.EHZ. 2011-10-20T06:11:10.47 10.0 undecidable manual Pg 0 0 0
OE.WTTA.HHZ. 2011-10-20T06:10:55.43 10.0 undecidable manual Pg 0 0 0
IV.CESI.HHZ. 2011-10-20T06:10:43.97 10.0 undecidable manual Pg 0 0 0
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