Earthquake with magnitude of Md 3.8 on date 11-04-1987 and time 03:36:58 (Italy) in region 3 km N Aprilia (LT)

A magnitude Md 3.8 earthquake occured in region: 3 km N Aprilia (LT), on

  • 11-04-1987 01:36:58 (UTC)
  • 11-04-1987 03:36:58 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.621, 12.644 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
Aprilia LT 3 73446 73446
Ardea RM 8 49183 122629
Lanuvio RM 8 13632 136261
Genzano di Roma RM 11 23970 160231
Ariccia RM 11 19407 179638
Albano Laziale RM 12 41715 221353
Nemi RM 13 1943 223296
Pomezia RM 13 62966 286262
Velletri RM 13 53303 339565
Castel Gandolfo RM 14 8997 348562
Cisterna di Latina LT 16 36868 385430
Rocca di Papa RM 17 17034 402464
Marino RM 17 43026 445490
Nettuno RM 18 49167 494657
Grottaferrata RM 19 20327 514984
Anzio RM 19 54211 569195
Lariano RM 20 13432 582627

Municipalities with at least 50000 inhabitants

An earthquake occurred to
3 Km N of Aprilia (73446 inhabitants)
13 Km E of Pomezia (62966 inhabitants)
13 Km SW of Velletri (53303 inhabitants)
19 Km N of Anzio (54211 inhabitants)
28 Km NW of Latina (125985 inhabitants)
33 Km SE of Roma (2864731 inhabitants)
38 Km E of Fiumicino (78395 inhabitants)
40 Km SW of Tivoli (56533 inhabitants)
43 Km S of Guidonia Montecelio (88673 inhabitants)
88 Km SE of Civitavecchia (52991 inhabitants)
99 Km SE of Viterbo (67173 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000
Md 3.8 1987-04-11
01:36:58
41.621 12.644 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 44559
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-04-11 01:36:58 ± 0.151
Latitude 41.6210 ± 0.0179
Longitude 12.6440 ± 0.0172
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 44559

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 2449.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 157
Number of associated phases, regardless of their use for origin computation 50
Number of defining phases 50
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.00785
Epicentral distance of station farthest from the epicenter (degree) 0.07536
Number of stations at which the event was observed 47
Number of stations from which data was used for origin computation 47
Magnitude information

Md:3.8

Field Value
Value 3.8
Uncertainty
Num. used stations 5
Type of magnitude Md
Reference to an origin 44559
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:44:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.LMR.Z. 1987-04-11T01:39:05.30 10.0 undecidable manual SN 293 0.0435 0.46 0.5
--.FRF.Z. 1987-04-11T01:39:05.00 10.0 undecidable manual SN 296 0.0433 0.52 0.4
--.CAF.Z. 1987-04-11T01:39:00.20 10.0 undecidable manual PN 297 0.0754 0.37 0.9
--.SBF.Z. 1987-04-11T01:38:56.40 10.0 undecidable manual SN 302 0.0398 1.14 0.2
--.KBN.Z. 1987-04-11T01:38:30.70 10.0 undecidable manual PN 97 0.0558 0.66 0.8
--.BNI.Z. 1987-04-11T01:38:20.20 10.0 undecidable manual PN 311 0.0497 -0.58 1
--.TIR.Z. 1987-04-11T01:38:20.00 10.0 undecidable manual PN 91 0.0486 0.86 0.7
--.KBA.Z. 1987-04-11T01:38:20.00 10.0 undecidable manual PN 5 0.0493 -0.07 1.3
--.ORO.Z. 1987-04-11T01:38:17.50 10.0 undecidable manual PN 322 0.0471 0.73 0.8
--.ORX.Z. 1987-04-11T01:38:17.50 10.0 undecidable manual PN 322 0.0471 0.68 0.9
--.SDA.Z. 1987-04-11T01:38:16.00 10.0 undecidable manual PN 84 0.0461 0.85 0.7
--.VAI.Z. 1987-04-11T01:38:16.50 10.0 undecidable manual PN 328 0.0457 1.84 0.1
--.FOI.Z. 1987-04-11T01:38:13.50 10.0 undecidable manual PN 1 0.0447 0.38 1.2
--.SOO.Z. 1987-04-11T01:38:13.40 10.0 undecidable manual PN 308 0.0447 0.31 1.3
--.LRG.Z. 1987-04-11T01:38:13.90 10.0 undecidable manual PN 294 0.0448 0.7 0.9
--.RBL.Z. 1987-04-11T01:38:13.00 10.0 undecidable manual PN 8 0.0437 1.37 0.3
--.FRF.Z. 1987-04-11T01:38:10.30 10.0 undecidable manual PN 296 0.0433 -0.74 0.9
--.LMR.Z. 1987-04-11T01:38:10.60 10.0 undecidable manual PN 293 0.0435 -0.65 1
--.STV.Z. 1987-04-11T01:38:09.20 10.0 undecidable manual PN 306 0.0422 -0.12 1.4
--.ROB.Z. 1987-04-11T01:38:05.20 10.0 undecidable manual PN 309 0.0396 -0.08 1.5
--.SBF.Z. 1987-04-11T01:38:05.40 10.0 undecidable manual PN 302 0.0398 -0.32 1.4
--.CTI.Z. 1987-04-11T01:38:05.00 10.0 undecidable manual PN 351 0.0403 -1.41 0.2
--.CEY.Z. 1987-04-11T01:38:05.30 10.0 undecidable manual PN 17 0.0388 1.23 0.4
--.SAL.Z. 1987-04-11T01:38:04.20 10.0 undecidable manual PN 340 0.0384 0.71 1
--.CKI.Z. 1987-04-11T01:38:03.20 10.0 undecidable manual PN 313 0.0381 0.07 1.5
--.FIN.Z. 1987-04-11T01:38:02.00 10.0 undecidable manual PN 310 0.0373 0.14 1.5
--.TRI.Z. 1987-04-11T01:38:01.00 10.0 undecidable manual PN 11 0.0375 -1.05 0.6
--.IMP.Z. 1987-04-11T01:38:00.90 10.0 undecidable manual PN 305 0.0376 -1.27 0.4
--.GR9.Z. 1987-04-11T01:38:00.50 10.0 undecidable manual PN 133 0.0362 0.38 1.4
--.CO9.Z. 1987-04-11T01:37:58.50 10.0 undecidable manual PN 325 0.0352 -0.1 1.6
--.BRT.Z. 1987-04-11T01:37:52.00 10.0 undecidable manual PN 101 0.0312 -0.44 1.3
--.TS9.Z. 1987-04-11T01:37:51.50 10.0 undecidable manual PN 124 0.0308 -0.3 1.5
--.ORI.Z. 1987-04-11T01:37:50.20 10.0 undecidable manual PN 118 0.0294 0.39 1.4
--.BAI.Z. 1987-04-11T01:37:49.00 10.0 undecidable manual PN 98 0.0289 -0.04 1.6
--.CVF.Z. 1987-04-11T01:37:45.00 10.0 undecidable manual PN 290 0.0266 -0.44 1.3
--.BDI.Z. 1987-04-11T01:37:44.00 10.0 undecidable manual PN 329 0.0257 -0.21 1.5
--.PS9.Z. 1987-04-11T01:37:40.50 10.0 undecidable manual PN 324 0.0235 -0.27 1.5
--.MG9.Z. 1987-04-11T01:37:40.50 10.0 undecidable manual PN 123 0.0238 -0.78 0.9
--.FIR.Z. 1987-04-11T01:37:38.50 10.0 undecidable manual PN 335 0.0214 0.92 0.7
--.PGD.Z. 1987-04-11T01:37:37.00 10.0 undecidable manual PN 344 0.0211 -0.18 1.6
--.SGO.Z. 1987-04-11T01:37:35.50 10.0 undecidable manual PN 117 0.0204 -0.53 1.2
--.AM8.Z. 1987-04-11T01:37:33.53 10.0 undecidable manual PN 20 0.0185 0.49 1.3
--.CRE.Z. 1987-04-11T01:37:33.50 10.0 undecidable manual PN 346 0.0185 0.31 1.5
--.ARV.Z. 1987-04-11T01:37:30.50 10.0 undecidable manual PN 7 0.017 -0.32 1.5
--.CM8.Z. 1987-04-11T01:37:26.72 10.0 undecidable manual PN 13 0.0145 -0.34 1.4
--.ASS.Z. 1987-04-11T01:37:23.50 10.0 undecidable manual PN 1 0.013 -1.16 0.9
--.DUI.Z. 1987-04-11T01:37:23.00 10.0 undecidable manual PN 88 0.0121 -0.48 1.3
--.MAO.Z. 1987-04-11T01:37:22.40 10.0 undecidable manual PN 306 0.0122 -1.19 0.4
--.AQU.Z. 1987-04-11T01:37:15.80 10.0 undecidable manual PG 38 0.0083 -1.02 0.6
--.SD1.Z. 1987-04-11T01:37:13.00 10.0 negative manual PG! 84 0.0079 -2.91 0
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
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