Earthquake with magnitude of Mwp 6.8 on date 21-09-2015 and time 19:39:59 (Italy) in region Near coast of central Chile [Land: Chile]

A magnitude Mwp 6.8 earthquake occured in region: Near coast of central Chile [Land: Chile], on

  • 21-09-2015 17:39:59 (UTC)
  • 21-09-2015 19:39:59 (UTC +02:00) Italian time
  • 21-09-2015 14:39:59 (UTC -03:00) local time in the region of the earthquake (America/Santiago)

and geographic coordinates (lat, lon) -31.56, -71.46 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 6.8

Mwpd 6.8
2015-09-21
17:39:59
-31.56 -71.46 20 2015-09-21
18:13:04
Sala Sismica INGV-Roma 21510871
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2015-09-21 17:39:59
Latitude -31.56
Longitude -71.46
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 21510871

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 16346
Semi-minor axis of confidence ellipse (meter) 9352
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) 14913.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 94.2954
Number of associated phases, regardless of their use for origin computation 101
Number of defining phases 101
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.46992
Epicentral distance of station closest to the epicenter (degree) 2.63399
Epicentral distance of station farthest from the epicenter (degree) 100.46657
Number of stations at which the event was observed 96
Number of stations from which data was used for origin computation 96
Magnitudes information

Mwp:6.8

Field Value
Value 6.8
Uncertainty 0.1
Num. used stations 68
Type of magnitude Mwp
Reference to an origin 21510871
Agency INGV
Autore early-est_ee1.1.8
Time of creation (UTC) 2015-09-21 18:13:05

Mwpd:6.8

Field Value
Value 6.8
Uncertainty 0.1
Num. used stations 63
Type of magnitude Mwpd
Reference to an origin 21510871
Agency INGV
Autore early-est_ee1.1.8
Time of creation (UTC) 2015-09-21 18:13:05

mb:6.2

Field Value
Value 6.2
Uncertainty 0.2
Num. used stations 73
Type of magnitude mb
Reference to an origin 21510871
Agency INGV
Autore early-est_ee1.1.8
Time of creation (UTC) 2015-09-21 18:13:05
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
TT.TATN.HHZ.00 2015-09-21T17:53:45.41 10.0 positive automatic Pdiff 58 100.4666 1.86159 0
IU.PAB.BHZ.00 2015-09-21T17:53:16.17 10.0 negative automatic P 45 94.4489 -0.316869 0.0645912
PM.PESTR.BHZ. 2015-09-21T17:53:04.15 10.0 positive automatic P 44 92.0727 -1.29716 0.0371367
GE.MTE.BHZ. 2015-09-21T17:53:09.55 10.0 positive automatic P 43 93.0852 -0.64447 0.0623144
US.NLWA.BHZ.00 2015-09-21T17:53:04.75 10.0 positive automatic P 328 91.9106 0.0136612 0.0651932
LX.MORF.BHZ. 2015-09-21T17:52:58.20 10.0 positive automatic P 45 90.4232 0.380308 0.0912392
IU.LSZ.BHZ.00 2015-09-21T17:52:57.42 10.0 positive automatic P 108 89.9823 1.54861 0.0942338
IU.COR.BHZ.00 2015-09-21T17:52:54.42 10.0 positive automatic P 326 89.5708 0.661147 0.0784055
US.HAWA.BHZ.00 2015-09-21T17:52:51.83 10.0 positive automatic P 329 89.2152 -0.315888 0.095035
WM.AVE.BHZ. 2015-09-21T17:52:49.45 10.0 positive automatic P 49 88.6 0.231993 0.0793705
UW.BRAN.BHZ. 2015-09-21T17:52:45.23 10.0 positive automatic P 330 87.8937 -0.808635 0.0699436
NZ.URZ.HHZ.10 2015-09-21T17:52:37.27 10.0 positive automatic P 227 85.4278 3.46546 0.133072
CN.SCHQ.BHZ. 2015-09-21T17:52:37.18 10.0 positive automatic P 3 86.4835 -1.91761 0.11299
NZ.KHZ.HHZ.10 2015-09-21T17:52:35.09 10.0 positive automatic PcP 222 84.9962 0.189397 0
BK.WDC.BHZ.00 2015-09-21T17:52:35.82 10.0 positive automatic P 324 86.2118 -1.90167 0.118989
US.WVOR.BHZ.00 2015-09-21T17:52:34.55 10.0 positive automatic P 327 85.7385 -1.01205 0.0916952
NZ.ODZ.HHZ.10 2015-09-21T17:52:34.18 10.0 positive automatic P 219 84.9076 2.94643 0.0455823
IM.PD31.BHZ. 2015-09-21T17:52:28.03 10.0 positive automatic sP 333 82.1341 2.88695 0
CN.ULM.BHZ. 2015-09-21T17:52:27.73 10.0 negative automatic P 345 84.6225 -2.06781 0.131383
BK.CMB.BHZ.00 2015-09-21T17:52:22.47 10.0 positive automatic P 323 83.1972 -0.1148 0.144701
BK.SAO.BHZ.00 2015-09-21T17:52:20.65 10.0 positive automatic P 322 82.7842 0.264179 0.113492
GT.LBTB.BHZ.00 2015-09-21T17:52:18.95 10.0 positive automatic P 115 82.7262 -1.2686 0.152286
PM.PMOZ.BHZ. 2015-09-21T17:52:18.30 10.0 positive automatic P 43 82.2649 0.495764 0.117975
IU.CASY.BHZ.00 2015-09-21T17:52:17.42 10.0 positive automatic P 181 82.142 0.441756 0.148499
IM.PD31.BHZ. 2015-09-21T17:52:16.03 10.0 positive automatic P 333 82.1341 -1.29295 0.155639
CN.DRLN.BHZ. 2015-09-21T17:52:14.00 10.0 positive automatic P 9 81.7665 -1.04215 0.153412
CI.PHL.BHZ. 2015-09-21T17:52:13.12 10.0 positive automatic P 321 81.2819 0.616473 0.157601
CN.KAPO.BHZ. 2015-09-21T17:52:12.63 10.0 negative automatic P 353 81.6056 -1.56759 0.158439
IU.RSSD.BHZ.00 2015-09-21T17:52:12.02 10.0 negative automatic P 337 81.3112 -0.938295 0.162965
CN.ICQ.BHZ. 2015-09-21T17:52:11.40 10.0 positive automatic P 3 81.1668 -0.441876 0.160448
GT.BOSA.BHZ.00 2015-09-21T17:52:09.53 10.0 negative automatic P 118 80.5995 0.499564 0.167444
US.TPNV.BHZ.00 2015-09-21T17:52:07.38 10.0 positive automatic P 325 80.2909 -0.0410023 0.172283
NN.PRN.HHZ. 2015-09-21T17:52:06.39 10.0 positive automatic P 326 80.0806 0.119577 0.176761
IU.TSUM.BHZ.00 2015-09-21T17:52:02.87 10.0 negative automatic P 106 79.297 0.900117 0.169501
IU.KOWA.BHZ.00 2015-09-21T17:52:01.50 10.0 positive automatic P 65 79.3096 -0.381739 0.181489
IW.SMCO.BHZ.00 2015-09-21T17:51:55.27 10.0 positive automatic P 333 78.0537 -0.236698 0.189117
II.PFO.BHZ.00 2015-09-21T17:51:54.12 10.0 positive automatic P 323 77.7559 0.647509 0.191984
CN.MNTQ.BHZ. 2015-09-21T17:51:49.20 10.0 positive automatic P 358 77.0853 -0.323805 0.208199
CN.GAC.BHZ. 2015-09-21T17:51:49.43 10.0 positive automatic P 357 77.3493 -1.57021 0.189327
US.WUAZ.BHZ.00 2015-09-21T17:51:47.95 10.0 positive automatic P 328 76.828 -0.378988 0.183941
CN.SADO.BHZ. 2015-09-21T17:51:45.50 10.0 negative automatic P 354 76.6496 -1.58775 0.202819
II.SUR.BHZ.00 2015-09-21T17:51:42.12 10.0 positive automatic P 119 75.4094 1.833 0.215319
AU.MAW.BHZ. 2015-09-21T17:51:38.34 10.0 positive automatic P 164 75.0976 0.150776 0.23201
US.CBKS.BHZ.00 2015-09-21T17:51:37.70 10.0 positive automatic P 338 75.1301 -0.790104 0.103099
US.KSU1.BHZ.00 2015-09-21T17:51:33.00 10.0 positive automatic P 340 74.4278 -1.36415 0.106544
IU.ANMO.BHZ.00 2015-09-21T17:51:32.67 10.0 positive automatic P 331 74.1969 -0.605852 0.217773
IU.HRV.BHZ.00 2015-09-21T17:51:32.67 10.0 positive automatic P 360 74.0664 0.431342 0.234735
IU.TUC.BHZ.00 2015-09-21T17:51:31.07 10.0 positive automatic P 326 73.9 -0.316561 0.187445
GT.DBIC.BHZ.00 2015-09-21T17:51:31.50 10.0 positive automatic P 71 74.0153 -0.428716 0.22207
G.PPTF.BHZ.00 2015-09-21T17:51:28.20 10.0 positive automatic sP 261 70.9995 -6.15015 0
IU.SSPA.BHZ.00 2015-09-21T17:51:21.87 10.0 positive automatic P 355 72.4407 -0.785009 0.24676
IU.CCM.BHZ.00 2015-09-21T17:51:18.47 10.0 positive automatic P 344 72.0196 -1.65535 0.251393
US.WMOK.BHZ.00 2015-09-21T17:51:13.38 10.0 positive automatic P 337 71.1043 -1.28224 0.261613
IU.WCI.BHZ.00 2015-09-21T17:51:12.77 10.0 negative automatic P 348 71.1462 -2.09173 0.261141
US.MIAR.BHZ.00 2015-09-21T17:51:03.15 10.0 positive automatic P 341 69.3051 -0.436442 0.289014
IU.WVT.BHZ.00 2015-09-21T17:51:02.32 10.0 positive automatic P 346 69.4084 -1.90046 0.140543
IM.TX31.BHZ. 2015-09-21T17:50:55.75 10.0 positive automatic P 330 68.1557 -0.8165 0.306614
US.JCT.BHZ.00 2015-09-21T17:50:52.33 10.0 positive automatic P 334 67.6163 -0.768124 0.313354
US.CNNC.BHZ.00 2015-09-21T17:50:48.93 10.0 negative automatic P 354 67.0726 -0.633443 0.288894
IU.SLBS.BHZ.00 2015-09-21T17:50:46.22 10.0 positive automatic P 322 66.3893 0.886771 0.325041
GT.VNDA.BHZ.00 2015-09-21T17:50:45.98 10.0 negative automatic P 191 66.355 0.978142 0.329399
IU.HKT.BHZ.00 2015-09-21T17:50:40.62 10.0 positive automatic P 337 65.7338 -0.288058 0.325676
IU.SBA.BHZ.00 2015-09-21T17:50:39.50 10.0 negative automatic P 191 65.3368 1.07233 0.338564
IU.BBSR.BHZ.00 2015-09-21T17:50:31.07 10.0 positive automatic P 6 64.2503 -0.266365 0.332992
US.BRAL.BHZ.00 2015-09-21T17:50:31.30 10.0 positive automatic P 345 64.4464 -1.32968 0.16164
II.SHEL.BHZ.00 2015-09-21T17:50:13.82 10.0 positive automatic P 92 61.2519 2.37536 0.39366
IU.DWPF.BHZ.00 2015-09-21T17:50:04.72 10.0 positive automatic P 350 60.4225 -0.99709 0.347446
IU.QSPA.BHZ.00 2015-09-21T17:49:52.52 10.0 positive automatic P 180 58.4917 -0.352533 0.43324
GE.SNAA.BHZ. 2015-09-21T17:49:16.21 10.0 positive automatic P 159 53.515 -0.701437 0.509394
CU.GRTK.BHZ.00 2015-09-21T17:49:12.88 10.0 positive automatic P 0 53.0734 -0.647054 0.238362
CU.GTBY.BHZ.00 2015-09-21T17:49:02.13 10.0 positive automatic P 356 51.607 -0.527009 0.521595
CU.MTDJ.BHZ.00 2015-09-21T17:48:50.78 10.0 positive automatic P 352 50.1278 -0.882052 0.260654
CU.ANWB.BHZ.00 2015-09-21T17:48:48.33 10.0 positive automatic P 12 50.0966 -2.94227 0.452218
IU.SJG.BHZ.00 2015-09-21T17:48:47.72 10.0 positive automatic P 7 49.9304 -2.35134 0.507631
CU.TGUH.BHZ.00 2015-09-21T17:48:35.73 10.0 positive automatic P 339 48.0764 -0.265766 0.470763
G.FDF.BHZ.00 2015-09-21T17:48:28.05 10.0 positive automatic P 14 47.3413 -2.11885 0.559173
CU.GRGR.BHZ.00 2015-09-21T17:48:07.88 10.0 positive automatic P 14 44.693 -1.37782 0.527625
II.JTS.BHZ.00 2015-09-21T17:48:03.27 10.0 positive automatic P 341 43.8038 1.11595 0.54579
IU.RCBR.BHZ.00 2015-09-21T17:47:47.77 10.0 positive automatic P 60 42.0296 -0.0176474 0.551184
CU.BCIP.BHZ.00 2015-09-21T17:47:44.53 10.0 positive automatic P 347 41.5108 1.04069 0.628636
IU.SDV.BHZ.00 2015-09-21T17:47:33.92 10.0 positive automatic P 1 40.453 -1.1243 0.564007
IU.PAYG.BHZ.00 2015-09-21T17:46:57.17 10.0 positive automatic P 326 35.6517 2.8449 0.795608
II.HOPE.BHZ.00 2015-09-21T17:46:37.42 10.0 positive automatic P 143 33.6308 0.605304 0.854806
IU.PMSA.BHZ.00 2015-09-21T17:46:35.97 10.0 positive automatic P 174 33.5252 0.0710764 0.818873
IU.OTAV.BHZ.00 2015-09-21T17:46:29.27 10.0 positive automatic P 347 32.4826 1.88537 0.921219
IU.SAML.BHZ.00 2015-09-21T17:45:10.17 10.0 positive automatic P 21 23.8843 0.233667 0.909091
G.SPB.BHZ.00 2015-09-21T17:44:57.85 10.0 positive automatic P 75 22.6785 -0.01254 0.43956
II.EFI.BHZ.00 2015-09-21T17:44:53.77 10.0 positive automatic P 158 22.3825 -0.861875 0.43956
C.GO10.BHZ. 2015-09-21T17:44:46.60 10.0 negative automatic P 179 21.5923 0.320872 0.952381
II.NNA.BHZ.00 2015-09-21T17:44:33.32 10.0 positive automatic P 345 20.195 2.14741 0.701754
GT.LPAZ.BHZ.00 2015-09-21T17:43:37.10 10.0 negative automatic P 12 15.5712 0.31485 0.481928
GT.CPUP.BHZ.00 2015-09-21T17:43:06.60 10.0 positive automatic P 71 13.4067 -0.177613 0.941176
IU.TRQA.BHZ.00 2015-09-21T17:42:22.47 10.0 positive automatic P 132 10.1238 0.514414 0.930233
GE.LVC.BHZ.00 2015-09-21T17:42:10.42 10.0 positive automatic P 15 9.2259 0.36256 0.43956
GT.PLCA.BHZ.00 2015-09-21T17:42:07.88 10.0 positive automatic P 176 9.1979 -1.47552 0.963855
C.GO03.BHZ. 2015-09-21T17:41:03.40 10.0 positive automatic P 15 4.1087 3.97789 0.235294
IU.LCO.BHZ.00 2015-09-21T17:40:43.77 10.0 positive automatic P 15 2.634 4.35927 0.15873
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://terremoti.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