Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Mw 3.7 on date 20-05-2006 and time 07:05:56 (UTC) in region 4 km NE Ragalna (CT)

A magnitude Mw 3.7 earthquake occured in region: 4 km NE Ragalna (CT), on

  • 20-05-2006 07:05:56 (UTC)
  • 20-05-2006 09:05:56 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.6620, 14.9630 at 18 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Ragalna CT 4 3924 3924
Nicolosi CT 8 7463 11387
Belpasso CT 8 28108 39495
Santa Maria di Licodia CT 8 7641 47136
Biancavilla CT 9 24007 71143
Pedara CT 10 14102 85245
Paternò CT 11 48228 133473
Camporotondo Etneo CT 11 5023 138496
San Pietro Clarenza CT 11 7743 146239
Trecastagni CT 11 10910 157149
Adrano CT 11 36122 193271
Mascalucia CT 13 31958 225229
Zafferana Etnea CT 13 9517 234746
Viagrande CT 13 8563 243309
Tremestieri Etneo CT 14 20589 263898
Gravina di Catania CT 14 25838 289736
Aci Bonaccorsi CT 15 3524 293260
San Giovanni la Punta CT 15 23060 316320
Milo CT 15 1087 317407
Sant'Agata li Battiati CT 15 9479 326886
Aci Sant'Antonio CT 16 17984 344870
Santa Venerina CT 16 8592 353462
Misterbianco CT 16 49410 402872
Motta Sant'Anastasia CT 17 12116 414988
San Gregorio di Catania CT 17 11966 426954
Valverde CT 17 7840 434794
Aci Catena CT 17 29851 464645
Bronte CT 18 19172 483817
Sant'Alfio CT 19 1582 485399
Acireale CT 19 52622 538021
Aci Castello CT 20 18723 556744
Centuripe EN 20 5470 562214

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km W of Acireale (52622 inhabitants)
21 Km NW of Catania (314555 inhabitants)
73 Km NW of Siracusa (122291 inhabitants)
78 Km SW of Reggio di Calabria (183035 inhabitants)
79 Km SW of Messina (238439 inhabitants)
82 Km E of Caltanissetta (63360 inhabitants)
84 Km N of Ragusa (73313 inhabitants)
88 Km NE of Vittoria (63339 inhabitants)
91 Km N of Modica (54633 inhabitants)
91 Km NE of Gela (75827 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
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 3.7
Mw 3.7 		2006-05-20
07:05:56		 37.662 14.963 18 2014-10-21
12:27:13		 Bollettino Sismico Italiano INGV 569299
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2006-05-20 07:05:56 ± 0.08
Latitude 37.6620 ± 0.0054
Longitude 14.9630 ± 0.0091
Depth (km) 18 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-SISPICK
Event type earthquake
Origin ID 569299

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 809
Semi-minor axis of confidence ellipse (meter) 200
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 82
Circular confidence region, given by single value of horizontal uncertainty (meter) 1000.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 89
Number of associated phases, regardless of their use for origin computation 72
Number of defining phases 52
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) 4.03795
Number of stations at which the event was observed 62
Number of stations from which data was used for origin computation 43
Magnitudes information

Mw:3.7

Field Value
Value 3.7
Uncertainty
Num. used stations
Type of magnitude Mw
Reference to an origin 569299
Agency INGV
Autore TDMT Historical
Time of creation (UTC) 2014-02-04 16:05:40

ML:3.7

Field Value
Value 3.7
Uncertainty 0.5
Num. used stations
Type of magnitude ML
Reference to an origin 569299
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-05 10:55:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MIDA.HHE. 2006-05-20T07:07:07.92 10.0 undecidable manual Sn 0 0 0
IV.RNI2.HHE. 2006-05-20T07:07:06.73 10.0 undecidable manual Pn 0 0 0
IV.VVLD.EHZ. 2006-05-20T07:07:06.28 10.0 undecidable manual Pn 0 0 0
MN.VSL.HHE. 2006-05-20T07:07:06.78 10.0 undecidable manual Pn 0 0 0
IV.INTR.HHZ. 2006-05-20T07:07:05.55 10.0 undecidable manual Pn 0 0 0
MN.CUC.HHZ. 2006-05-20T07:07:04.23 0.1 undecidable manual Sg 16 268.9308 -0.338 18
IV.MIDA.HHE. 2006-05-20T07:07:04.19 10.0 undecidable manual Pn 0 0 0
IV.TRIV.HHZ. 2006-05-20T07:07:02.08 10.0 undecidable manual Pn 0 0 0
IV.SDI.SHZ. 2006-05-20T07:07:00.54 10.0 undecidable manual Pn 0 0 0
IV.GIUL.BHN. 2006-05-20T07:06:59.40 10.0 undecidable manual Pn 0 0 0
IV.FGMS.SHZ. 2006-05-20T07:06:59.86 10.0 undecidable manual Pn 0 0 0
IV.RGNG.SHZ. 2006-05-20T07:06:58.48 0.1 undecidable manual Pg 7 448.218 0.513 21
IV.SGG.BHZ. 2006-05-20T07:06:58.79 10.0 undecidable manual Pn 0 0 0
IV.FG5.SHZ. 2006-05-20T07:06:53.88 10.0 undecidable manual Pn 0 0 0
IV.FG4.SHZ. 2006-05-20T07:06:52.02 10.0 undecidable manual Pn 0 0 0
IV.SGTA.HHE. 2006-05-20T07:06:52.38 10.0 undecidable manual Pn 0 0 0
IV.VULT.HHZ. 2006-05-20T07:06:50.63 10.0 undecidable manual Pn 0 0 0
IV.AMUR.HHZ. 2006-05-20T07:06:50.03 0.1 undecidable manual Pg 21 386.6241 -0.265 23
IV.NOCI.HHZ. 2006-05-20T07:06:49.97 0.1 undecidable manual Pg 27 391.1085 -0.88 19
IV.CAFE.HHZ. 2006-05-20T07:06:49.87 0.1 undecidable manual Pg 4 374.1477 1.125 17
IV.SNAL.HHZ. 2006-05-20T07:06:48.08 0.1 undecidable manual Pg 3 362.6592 0.767 20
IV.MCRV.HHZ. 2006-05-20T07:06:46.36 0.1 undecidable manual Pg 3 346.5864 1.038 18
IV.MRLC.HHN. 2006-05-20T07:06:45.50 10.0 undecidable manual Pg 0 0 0
IV.PTRP.EHZ. 2006-05-20T07:06:42.61 10.0 undecidable manual Pg 0 0 0
IV.SGO.SHZ. 2006-05-20T07:06:42.05 0.1 undecidable manual Pg 5 322.9323 -0.317 25
IV.SLCN.BHZ. 2006-05-20T07:06:40.69 0.1 undecidable manual Pg 11 308.0583 0.165 26
IV.CDRU.HHN. 2006-05-20T07:06:40.71 0.1 undecidable manual Pg 5 315.0513 -0.681 22
IV.ORI.EHZ. 2006-05-20T07:06:39.38 10.0 undecidable manual Pg 0 0 0
IV.SCHR.EHZ. 2006-05-20T07:06:39.56 0.1 undecidable manual Pg 18 297.3801 0.365 26
IV.CMPR.HHZ. 2006-05-20T07:06:37.71 0.1 undecidable manual Pg 6 296.0814 -1.323 18
IV.PTS.SHZ. 2006-05-20T07:06:36.05 0.1 undecidable manual Pg 251 278.9097 -0.844 27
IV.MGR.BHZ. 2006-05-20T07:06:35.62 0.1 undecidable manual Pg 10 279.3093 -1.326 21
MN.CUC.HHZ. 2006-05-20T07:06:34.69 0.1 undecidable manual Pg 16 268.9308 -0.968 28
IV.LVI.SHZ. 2006-05-20T07:06:31.86 0.1 undecidable manual Pg 280 232.8891 0.694 42
MN.TIP.HHZ. 2006-05-20T07:06:31.14 0.1 undecidable manual Pg 42 229.4925 0.392 48
IV.SERS.HHZ. 2006-05-20T07:06:28.94 0.1 undecidable manual Pg 44 213.9192 0.13 56
MN.WDD.HHZ. 2006-05-20T07:06:26.69 0.1 undecidable manual Pg 191 202.9413 -0.748 52
IV.GRI.EHZ. 2006-05-20T07:06:24.36 0.1 undecidable manual Pg 44 180.7857 -0.323 66
IV.USI.HHZ. 2006-05-20T07:06:24.64 0.1 undecidable manual Pg 307 194.0613 -1.692 32
IV.CLTB.SHZ. 2006-05-20T07:06:22.03 0.1 undecidable manual Pg 267 153.8349 0.724 65
IV.CORL.HHZ. 2006-05-20T07:06:21.25 0.1 undecidable manual Pg 281 147.741 0.879 63
IV.PLAC.HHZ. 2006-05-20T07:06:21.79 0.1 undecidable manual Pg 55 155.7219 0.228 75
IV.HAVL.BHZ. 2006-05-20T07:06:20.59 0.1 undecidable manual Sg 170 79.1652 0.754 38
IV.HMDC.BHZ. 2006-05-20T07:06:20.57 0.1 undecidable manual Sg 192 79.5648 0.626 40
IV.MCT.SHZ. 2006-05-20T07:06:19.95 10.0 undecidable manual Pg 0 0 0
IV.SOI.EHZ. 2006-05-20T07:06:14.02 0.1 negative manual Pg 64 105.9162 0.084 88
IV.HVZN.BHZ. 2006-05-20T07:06:14.73 0.1 undecidable manual Sg 202 57.8976 0.528 43
IV.SSY.BHZ. 2006-05-20T07:06:14.75 0.1 undecidable manual Sg 170 56.7987 0.845 38
MN.CEL.HHZ. 2006-05-20T07:06:13.92 0.1 negative manual Pg 51 105.0171 0.114 87
IV.AGST.SHZ. 2006-05-20T07:06:12.85 0.1 undecidable manual Sg 153 50.616 0.564 43
IV.SCLL.SHZ. 2006-05-20T07:06:12.02 0.1 undecidable manual Pg 45 93.1401 0.053 91
IV.SLNA.SHZ. 2006-05-20T07:06:12.76 0.1 undecidable manual Pg 354 100.6215 -0.369 83
IV.GIB.EHZ. 2006-05-20T07:06:11.84 0.1 undecidable manual Pg 294 89.7435 0.38 85
I1.HAGA.BHZ. 2006-05-20T07:06:11.37 0.1 undecidable manual Sg 158 45.1215 0.535 44
IV.ILLI.BHZ. 2006-05-20T07:06:11.30 0.1 undecidable manual Pg 359 86.9463 0.277 88
IV.MSI.SHZ. 2006-05-20T07:06:10.08 0.1 undecidable manual Pg 40 79.365 0.213 90
IV.CSLB.SHZ. 2006-05-20T07:06:10.70 0.1 undecidable manual Pg 291 85.0482 -0.027 92
IV.IVPL.BHZ. 2006-05-20T07:06:10.01 0.1 negative manual Pg 1 79.2651 0.166 91
IV.MMME.BHZ. 2006-05-20T07:06:10.32 0.1 undecidable manual Sg 40 39.627 0.917 39
IV.MSRU.BHZ. 2006-05-20T07:06:10.20 0.1 negative manual Pg 35 82.0512 -0.075 92
IV.HMDC.BHZ. 2006-05-20T07:06:09.27 0.1 undecidable manual Pg 192 79.5648 -0.623 81
IV.HAVL.BHZ. 2006-05-20T07:06:09.51 0.1 undecidable manual Pg 170 79.1652 -0.32 88
IV.MTTG.SHZ. 2006-05-20T07:06:09.61 0.1 negative manual Pg 59 74.8695 0.442 86
IV.SSY.BHZ. 2006-05-20T07:06:06.12 0.1 undecidable manual Pg 170 56.7987 -0.286 93
IV.HVZN.BHZ. 2006-05-20T07:06:06.00 0.1 negative manual Pg 202 57.8976 -0.577 86
IV.AGST.SHZ. 2006-05-20T07:06:05.15 0.1 undecidable manual Pg 153 50.616 -0.32 93
I1.HAGA.BHZ. 2006-05-20T07:06:04.22 0.1 undecidable manual Pg 158 45.1215 -0.412 92
IV.MMME.BHZ. 2006-05-20T07:06:03.78 0.1 undecidable manual Pg 40 39.627 -0.027 100
IV.MNO.SHZ. 2006-05-20T07:06:03.74 0.1 undecidable manual Pg 322 37.9287 0.179 98
IV.ESLN.BHZ. 2006-05-20T07:06:01.31 0.1 undecidable manual Sg 16 3.5964 -0.561 46
IV.ESLN.BHZ. 2006-05-20T07:05:58.92 0.1 undecidable manual Pg 16 3.5964 -0.538 94
IV.MURB.HHE. 2006-05-20T07:05:47.50 10.0 undecidable manual Pg 0 0 0
TDMT - Time Domain Moment Tensor

TDMT details

Field Value
MagnitudeMw 3.71
Scalar Moment4.5E+21 dyne-cm
Computed depth12 km
QualityCa
Variance Reduction%
Double Couple0%
CLVD0%
ISO0%
Model usedCIA
Modemanual
Statusfinal

Moment Tensor Components

Component Value
Mrr1.64E+21
Mtt-6.06E+20
Mpp-1.04E+21
Mrt-2.92E+21
Mrp-2.38E+20
Mtp3.1E+21

Nodal Planes

Name Strike Dip Rake
PN12807547
PN217545159

Fault Plane solution

Focal Mechanism

psmeca (GMT documentation)

12 280 75 47 175 45 159 4.5 21 0.5 0.5

TDMT references

More info and references

PDF Solution

Download TDMT soution in PDF format
Download TDMT soution in PDF format
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