ISTITUTO NAZIONALE DI GEOFISICA E VULCANOLOGIA

Earthquake with magnitude of Mwp 7.0 on date 04-12-2015 and time 22:24:57 (UTC) in region Southeast Indian Ridge [Sea]

A magnitude Mwp 7.0 earthquake occured in region: Southeast Indian Ridge [Sea], on

  • 04-12-2015 22:24:57 (UTC)
  • 04-12-2015 23:24:57 (UTC +01:00) Italian time
  • 05-12-2015 03:24:57 (UTC +05:00) local time in the region of the earthquake (Indian/Kerguelen)

and geographic coordinates (lat, lon) -47.59, 85.13 at 20 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

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

No Italian municipalities within 100 km from the epicenter with at least 50000 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.
Significant earthquakes since 1000 AD until 2006

Significant earthquakes since 1000 AD until 2006

This map shows the epicenters of the historical earthquakes catalogue CPT11 (Catalogo Parametrico dei Terremoti Italiani, 2011 version) with estimated magnitude ≥ 5.0 since 1000 AD until 2006. 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 mb 6.2
Mwp 7.0

Mwpd 7.0
2015-12-04
22:24:57
-47.59 85.13 20 2015-12-04
22:44:56
Sala Sismica INGV-Roma 22547501
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2015-12-04 22:24:57
Latitude -47.59
Longitude 85.13
Depth (km) 20 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 22547501

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 19674
Semi-minor axis of confidence ellipse (meter) 4835
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 165
Circular confidence region, given by single value of horizontal uncertainty (meter) 15921.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 40.8532
Number of associated phases, regardless of their use for origin computation 125
Number of defining phases 125
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.72879
Epicentral distance of station closest to the epicenter (degree) 10.03016
Epicentral distance of station farthest from the epicenter (degree) 106.51931
Number of stations at which the event was observed 120
Number of stations from which data was used for origin computation 120
Magnitudes information

Mwpd:7

Field Value
Value 7
Uncertainty 0.1
Num. used stations 81
Type of magnitude Mwpd
Reference to an origin 22547501
Agency INGV
Autore Auto added
Time of creation (UTC) 2015-12-04 22:44:58

Mwp:7

Field Value
Value 7
Uncertainty 0.1
Num. used stations 83
Type of magnitude Mwp
Reference to an origin 22547501
Agency INGV
Autore Auto added
Time of creation (UTC) 2015-12-04 22:44:58

mb:6.2

Field Value
Value 6.2
Uncertainty 0.3
Num. used stations 99
Type of magnitude mb
Reference to an origin 22547501
Agency INGV
Autore Auto added
Time of creation (UTC) 2015-12-04 22:44:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GE.LVC.BHZ.00 2015-12-04T22:39:20.02 10.0 positive automatic Pdiff 205 106.0013 13.1163 0
MN.CLTB.BHZ. 2015-12-04T22:39:19.25 10.0 negative automatic Pdiff 308 106.5193 10.3805 0
MN.TIR.BHZ. 2015-12-04T22:39:14.51 10.0 positive automatic Pdiff 315 106.0173 7.9921 0
HL.KEK.HHZ. 2015-12-04T22:39:07.75 10.0 positive automatic Pdiff 314 104.7874 6.7102 0
MN.TIP.BHZ. 2015-12-04T22:39:06.17 10.0 positive automatic Pdiff 311 105.8873 0.145406 0
HT.AGG.HHZ. 2015-12-04T22:38:59.19 10.0 positive automatic Pdiff 315 103.0205 5.5531 0
C.GO03.BHZ. 2015-12-04T22:38:59.30 10.0 positive automatic Pdiff 202 101.6065 12.3114 0
HT.ALN.HHZ. 2015-12-04T22:38:53.51 10.0 negative automatic Pdiff 318 102.7925 1.35746 0
II.TLY.BHZ.00 2015-12-04T22:38:39.97 10.0 negative automatic Pdiff 12 100.5286 -2.20204 0
II.BRVK.BHZ.00 2015-12-04T22:38:43.27 10.0 negative automatic Pdiff 351 101.4385 -2.90111 0
IU.LCO.BHZ.00 2015-12-04T22:38:43.02 10.0 positive automatic Pdiff 201 100.3636 1.29389 0
IU.KOWA.BHZ.00 2015-12-04T22:38:41.20 10.0 positive automatic Pdiff 281 100.0816 1.0592 0
GT.CPUP.BHZ.00 2015-12-04T22:38:34.83 10.0 positive automatic P 214 98.7247 0.770879 0.0396321
KZ.ABKAR.BHZ. 2015-12-04T22:38:33.20 10.0 positive automatic P 344 99.2683 -3.32715 0.041375
II.KIV.BHZ.00 2015-12-04T22:38:33.97 10.0 positive automatic P 331 98.871 -0.905737 0
GT.DBIC.BHZ.00 2015-12-04T22:38:25.60 10.0 positive automatic sP 275 94.9089 1.18823 0
IU.ULN.BHZ.00 2015-12-04T22:38:24.52 10.0 positive automatic P 15 97.3412 -3.57767 0.0482822
IU.MAJO.BHZ.00 2015-12-04T22:38:22.27 10.0 negative automatic P 40 96.5515 -2.04621 0.0498711
GT.DBIC.BHZ.00 2015-12-04T22:38:17.83 10.0 positive automatic P 275 94.9089 1.03834 0.0579964
JP.JGF.BHZ. 2015-12-04T22:38:16.70 10.0 negative automatic P 40 95.3882 -2.35096 0.0555626
IU.GNI.BHZ.00 2015-12-04T22:38:14.47 10.0 positive automatic P 330 94.7847 -2.00169 0.0599387
GE.CSS.BHZ. 2015-12-04T22:38:13.70 10.0 negative automatic P 320 94.6619 -1.99781 0.0299613
JP.JWT.BHZ. 2015-12-04T22:38:13.00 10.0 positive automatic P 39 94.277 -0.898016 0.0599814
IU.MAKZ.BHZ.00 2015-12-04T22:38:10.85 10.0 negative automatic P 358 94.4386 -3.87028 0.0639093
JP.JHS.BHZ. 2015-12-04T22:38:05.95 10.0 positive automatic P 38 93.0785 -2.48563 0.0708538
JP.JMN.BHZ. 2015-12-04T22:38:02.90 10.0 positive automatic P 39 92.2993 -1.95499 0.0754458
II.AAK.BHZ.00 2015-12-04T22:37:54.82 10.0 negative automatic P 352 90.7182 -2.89323 0.0797695
GT.PLCA.BHZ.00 2015-12-04T22:37:50.43 10.0 negative automatic P 198 89.0711 0.506431 0.0971125
GE.EIL.BHZ. 2015-12-04T22:37:49.80 10.0 negative automatic P 318 89.4395 -1.69559 0.0452269
JP.JSU.BHZ. 2015-12-04T22:37:46.40 10.0 positive automatic P 37 88.9441 -2.80973 0.0968683
G.COYC.BHZ.00 2015-12-04T22:37:29.70 10.0 negative automatic P 196 84.7122 1.12484 0.124864
JP.JMZ.BHZ. 2015-12-04T22:37:25.65 10.0 negative automatic P 41 84.2917 -0.770165 0
JP.JOW.BHZ. 2015-12-04T22:37:23.65 10.0 negative automatic P 38 83.9259 -0.934339 0.0906388
IU.GUMO.BHZ.00 2015-12-04T22:37:06.82 10.0 negative automatic P 58 80.971 -2.33101 0.0766376
JP.YOJ.BHZ. 2015-12-04T22:37:00.15 10.0 negative automatic P 35 79.7041 -2.16198 0
IU.TATO.BHZ.00 2015-12-04T22:37:00.02 10.0 negative automatic P 33 79.596 -1.73026 0.082515
II.SHEL.BHZ.00 2015-12-04T22:37:00.12 10.0 negative automatic P 258 78.8643 2.3083 0.177307
II.RAYN.BHZ.00 2015-12-04T22:36:59.72 10.0 positive automatic P 324 79.5375 -1.79112 0.171183
II.MSVF.BHZ.00 2015-12-04T22:36:57.97 10.0 positive automatic P 104 78.9078 -0.126425 0.152627
C.GO10.BHZ. 2015-12-04T22:36:51.33 10.0 positive automatic P 194 77.2319 2.54882 0.174734
II.UOSS.BHZ.00 2015-12-04T22:36:43.87 10.0 negative automatic P 333 77.0675 -3.91928 0.185737
II.EFI.BHZ.00 2015-12-04T22:36:41.92 10.0 positive automatic P 203 75.8485 1.06914 0.215876
G.SANVU.BHZ.00 2015-12-04T22:36:26.65 10.0 negative automatic P 95 73.3575 0.266024 0.216672
IU.HNR.BHZ.00 2015-12-04T22:36:23.07 10.0 negative automatic P 85 72.8184 -0.14067 0.219659
AU.RABL.BHZ. 2015-12-04T22:36:13.90 10.0 positive automatic P 75 71.5498 -1.75764 0.237303
G.ATD.BHZ.00 2015-12-04T22:36:06.35 10.0 negative automatic P 315 70.0453 -0.206392 0.261532
ND.MARNC.BHZ.00 2015-12-04T22:36:04.93 10.0 positive automatic P 100 69.6329 1.00471 0.285104
G.DZM.BHZ.00 2015-12-04T22:35:55.65 10.0 negative automatic P 99 68.1656 0.709996 0.302849
ND.KOUNC.BHZ.00 2015-12-04T22:35:52.84 10.0 negative automatic P 97 67.7851 0.437701 0.307538
II.HOPE.BHZ.00 2015-12-04T22:35:48.07 10.0 positive automatic P 213 66.8492 1.60143 0.291466
IU.CHTO.BHZ.00 2015-12-04T22:35:48.17 10.0 negative automatic P 14 67.5546 -2.84219 0.299693
II.MBAR.BHZ.00 2015-12-04T22:35:44.52 10.0 negative automatic P 297 66.3969 0.704174 0.324951
GE.SOCY.BHZ. 2015-12-04T22:35:39.97 10.0 negative automatic P 326 65.9002 -0.556467 0.214069
IU.PMSA.BHZ.00 2015-12-04T22:35:36.72 10.0 positive automatic P 194 65.0898 1.56354 0.326248
TM.UBPT.BHZ. 2015-12-04T22:35:35.59 10.0 positive automatic P 22 65.4505 -1.91463 0.329257
GE.PMG.BHZ.00 2015-12-04T22:35:30.32 10.0 negative automatic P 75 64.3492 -0.0119482 0.335534
NZ.OUZ.HHZ.10 2015-12-04T22:35:28.23 10.0 positive automatic P 115 63.8527 1.16456 0.365062
NZ.URZ.HHZ.10 2015-12-04T22:35:26.68 10.0 negative automatic P 119 63.9589 -1.09204 0.348397
IU.KMBO.BHZ.00 2015-12-04T22:35:16.22 10.0 negative automatic P 303 62.1754 -0.0272867 0.355459
IU.TSUM.BHZ.00 2015-12-04T22:35:07.77 10.0 positive automatic P 273 60.9149 0.145695 0.380289
GE.TNTI.BHZ. 2015-12-04T22:35:04.12 10.0 negative automatic P 50 60.7013 -1.84169 0.383165
MY.LDM.BHZ. 2015-12-04T22:35:03.52 10.0 negative automatic P 39 60.3743 -0.23092 0.396604
GE.FAKI.BHZ. 2015-12-04T22:35:02.17 10.0 positive automatic P 57 60.266 -0.834957 0.407587
MY.KKM.BHZ. 2015-12-04T22:35:00.47 10.0 positive automatic P 36 60.2224 -2.35379 0.380994
NZ.KHZ.HHZ.10 2015-12-04T22:34:56.87 10.0 positive automatic P 121 59.2069 1.17389 0.412978
GE.WIN.BHZ. 2015-12-04T22:34:54.90 10.0 positive automatic P 270 58.9163 0.929245 0.407626
AU.COEN.BHZ. 2015-12-04T22:34:49.50 10.0 negative automatic P 75 58.3623 -0.36652 0.43003
GE.SANI.BHZ. 2015-12-04T22:34:42.47 10.0 negative automatic P 51 57.5752 -1.83397 0.417023
AU.LHI.BHZ. 2015-12-04T22:34:41.55 10.0 positive automatic P 102 56.9608 1.576 0.456019
NZ.ODZ.HHZ.10 2015-12-04T22:34:34.20 10.0 negative automatic P 122 55.9548 1.36164 0.47583
IU.CTAO.BHZ.00 2015-12-04T22:34:32.57 10.0 positive automatic P 83 55.9769 -0.440926 0.470959
AU.EIDS.BHZ. 2015-12-04T22:34:30.75 10.0 negative automatic P 91 55.6159 0.347788 0.488124
GE.SAUI.BHZ. 2015-12-04T22:34:30.97 10.0 negative automatic P 60 55.5904 0.774976 0.426162
MY.SBM.BHZ. 2015-12-04T22:34:27.57 10.0 negative automatic P 34 55.3668 -1.03697 0.480346
MY.KUM.BHZ. 2015-12-04T22:34:20.77 10.0 negative automatic P 19 54.621 -2.42139 0.449168
GE.BKB.BHZ. 2015-12-04T22:34:18.77 10.0 negative automatic P 41 54.0191 -0.0435612 0.457808
GE.LHMI.BHZ. 2015-12-04T22:34:17.47 10.0 negative automatic P 15 53.8371 0.00390302 0.423601
GE.HALK.BHZ. 2015-12-04T22:34:16.15 10.0 positive automatic P 355 53.8236 -1.2371 0.481569
MY.KSM.BHZ. 2015-12-04T22:34:15.77 10.0 negative automatic P 32 53.7605 -1.14755 0.471801
AU.ARMA.BHZ. 2015-12-04T22:34:09.77 10.0 positive automatic P 96 52.7127 0.380102 0.5416
AU.KDU.BHZ. 2015-12-04T22:34:06.62 10.0 negative automatic P 65 52.5527 -1.40189 0.506741
II.KAPI.BHZ.00 2015-12-04T22:34:00.67 10.0 positive automatic P 46 51.8719 -2.33545 0.511539
AU.MTN.BHZ. 2015-12-04T22:34:00.05 10.0 negative automatic P 63 51.6174 -1.03119 0.540062
GT.LBTB.BHZ.00 2015-12-04T22:33:59.60 10.0 negative automatic P 274 51.5307 -0.999186 0.548008
AU.RIV.BHZ. 2015-12-04T22:33:53.32 10.0 positive automatic P 99 50.3023 2.15502 0.512981
II.SUR.BHZ.00 2015-12-04T22:33:50.92 10.0 positive automatic P 263 50.0406 1.44178 0.566221
GE.GSI.BHZ. 2015-12-04T22:33:50.42 10.0 positive automatic P 16 50.0895 0.857549 0.539701
GE.SOEI.BHZ. 2015-12-04T22:33:50.17 10.0 negative automatic P 54 50.1582 -0.0765281 0.483642
AU.QLP.BHZ. 2015-12-04T22:33:50.35 10.0 negative automatic P 87 50.1984 -0.0626965 0.478186
GE.BKNI.BHZ. 2015-12-04T22:33:48.12 10.0 negative automatic P 21 49.8818 0.142103 0.555659
GE.MMRI.BHZ. 2015-12-04T22:33:48.02 10.0 negative automatic P 51 50.0111 -0.952627 0.485757
II.MSEY.BHZ.00 2015-12-04T22:33:47.92 10.0 negative automatic P 320 49.8871 -0.168566 0.555573
GT.BOSA.BHZ.00 2015-12-04T22:33:44.25 10.0 positive automatic P 270 49.4018 -0.279755 0.563575
GE.KAAM.BHZ. 2015-12-04T22:33:43.12 10.0 negative automatic P 344 49.2355 0.076462 0.267607
G.CAN.BHZ.00 2015-12-04T22:33:34.60 10.0 negative automatic P 100 47.9866 1.0489 0.561142
II.WRAB.BHZ.00 2015-12-04T22:33:34.47 10.0 negative automatic P 73 48.257 -1.11541 0.596557
AU.MILA.BHZ. 2015-12-04T22:33:28.12 10.0 positive automatic P 102 47.1011 1.43236 0.602296
GE.JAGI.BHZ. 2015-12-04T22:33:18.32 10.0 negative automatic P 42 46.2062 -1.25033 0.553363
GE.SMRI.BHZ. 2015-12-04T22:33:18.07 10.0 negative automatic P 36 45.9183 0.766576 0.622705
AU.MCQ.BHZ. 2015-12-04T22:33:16.75 10.0 positive automatic sP 128 44.7441 1.49613 0
GE.SBV.BHZ. 2015-12-04T22:33:10.75 10.0 negative automatic P 307 44.9497 1.14311 0.302261
GE.SNAA.BHZ. 2015-12-04T22:33:09.11 10.0 negative automatic P 206 44.8901 -0.158302 0.612244
AU.TOO.BHZ. 2015-12-04T22:33:06.25 10.0 negative automatic P 100 44.3882 1.02124 0.657249
II.TAU.BHZ.00 2015-12-04T22:32:53.52 10.0 positive automatic P 108 42.8437 0.820536 0.661949
AU.HTT.BHZ. 2015-12-04T22:32:48.45 10.0 positive automatic P 91 42.3278 -0.164785 0.686735
IU.SBA.BHZ.00 2015-12-04T22:32:47.70 10.0 positive automatic P 162 42.0511 1.45421 0.646682
II.DGAR.BHZ.00 2015-12-04T22:32:42.37 10.0 positive automatic P 341 41.6081 -0.239281 0.699947
GT.VNDA.BHZ.00 2015-12-04T22:32:37.63 10.0 positive automatic P 161 41.0235 -0.208033 0.736462
AU.WRKA.BHZ. 2015-12-04T22:32:34.90 10.0 negative automatic P 72 40.6953 -0.315065 0.716884
GE.VOI.BHZ. 2015-12-04T22:32:29.90 10.0 positive automatic P 296 39.9432 0.857712 0.730991
IU.MBWA.BHZ.00 2015-12-04T22:32:15.17 10.0 negative automatic P 59 38.3501 -0.415195 0.761329
AU.FORT.BHZ. 2015-12-04T22:32:02.02 10.0 negative automatic P 78 36.6671 0.690332 0.812954
G.RER.BHZ.00 2015-12-04T22:31:53.55 10.0 negative automatic P 308 35.4526 2.50308 0.818086
AU.GIRL.BHZ. 2015-12-04T22:31:39.95 10.0 negative automatic P 53 34.0948 0.750033 0.781755
AU.MORW.BHZ. 2015-12-04T22:31:05.25 10.0 negative automatic P 63 30.1757 0.392007 0.94876
IU.NWAO.BHZ.00 2015-12-04T22:30:47.92 10.0 negative automatic P 70 28.2539 0.106984 0.851064
AU.MAW.BHZ. 2015-12-04T22:29:58.56 10.0 positive automatic P 202 23.0021 -0.955897 0.930233
IU.CASY.BHZ.00 2015-12-04T22:29:58.97 10.0 negative automatic P 154 22.9164 0.358322 0.909091
G.CRZF.BHZ.00 2015-12-04T22:29:55.75 10.0 positive automatic P 261 22.5443 1.05992 0.615385
G.AIS.BHZ.00 2015-12-04T22:27:41.80 10.0 positive automatic P 328 11.2521 6.14521 0.833333
G.PAF.BHZ.00 2015-12-04T22:27:13.50 10.0 positive automatic P 254 10.0302 -5.42004 0.930233
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.
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Type Description Link
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