Earthquake with magnitude of Md 3.3 on date 15-03-1987 and time 00:09:18 (Italy) in region 5 km SW Velletri (RM)

A magnitude Md 3.3 earthquake occured in region: 5 km SW Velletri (RM), on

  • 14-03-1987 23:09:18 (UTC)
  • 15-03-1987 00:09:18 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.648, 12.751 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
Velletri RM 5 53303 53303
Lanuvio RM 5 13632 66935
Genzano di Roma RM 8 23970 90905
Nemi RM 9 1943 92848
Cisterna di Latina LT 9 36868 129716
Aprilia LT 10 73446 203162
Ariccia RM 11 19407 222569
Lariano RM 11 13432 236001
Albano Laziale RM 12 41715 277716
Rocca di Papa RM 13 17034 294750
Cori LT 14 11065 305815
Castel Gandolfo RM 14 8997 314812
Rocca Massima LT 15 1136 315948
Marino RM 16 43026 358974
Rocca Priora RM 16 11962 370936
Grottaferrata RM 17 20327 391263
Artena RM 17 14276 405539
Ardea RM 18 49183 454722
Monte Compatri RM 18 11978 466700
Frascati RM 19 22087 488787
Monte Porzio Catone RM 19 8693 497480
Labico RM 19 6379 503859
Norma LT 20 3946 507805
San Cesareo RM 20 15153 522958

Municipalities with at least 50000 inhabitants

An earthquake occurred to
5 Km SW of Velletri (53303 inhabitants)
10 Km NE of Aprilia (73446 inhabitants)
21 Km E of Pomezia (62966 inhabitants)
24 Km NW of Latina (125985 inhabitants)
24 Km NE of Anzio (54211 inhabitants)
35 Km SE of Roma (2864731 inhabitants)
35 Km S of Tivoli (56533 inhabitants)
39 Km S of Guidonia Montecelio (88673 inhabitants)
45 Km E of Fiumicino (78395 inhabitants)
93 Km SE of Civitavecchia (52991 inhabitants)
95 Km SW of L'Aquila (69753 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 3.3 1987-03-14
23:09:18
41.648 12.751 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 42879
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-03-14 23:09:18 ± 0.499
Latitude 41.6480 ± 0.0277
Longitude 12.7510 ± 0.0412
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 42879

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) 4606.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 228
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.6
Epicentral distance of station closest to the epicenter (degree) 0.00146
Epicentral distance of station farthest from the epicenter (degree) 0.01983
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitude information

Md:3.3

Field Value
Value 3.3
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 42879
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:42:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.SGO.Z. 1987-03-14T23:09:56.50 10.0 undecidable manual PN 118 0.0198 0.83 0.7
--.MSC.Z. 1987-03-14T23:09:55.20 10.0 undecidable manual SG 116 0.0091 1.05 0.2
--.TR9.Z. 1987-03-14T23:09:52.90 10.0 undecidable manual PN 107 0.0176 0.76 0.8
--.ARV.Z. 1987-03-14T23:09:51.50 10.0 undecidable manual PN 4 0.0167 0.73 0.8
--.AQU.Z. 1987-03-14T23:09:50.00 10.0 undecidable manual SG 34 0.0077 1.22 0.1
--.SD1.Z. 1987-03-14T23:09:47.00 10.0 undecidable manual SG 85 0.0071 0.21 0.9
--.ASS.Z. 1987-03-14T23:09:45.00 10.0 undecidable manual PN 357 0.0127 0.27 1.4
--.DUI.Z. 1987-03-14T23:09:43.00 10.0 undecidable manual PN 88 0.0114 0.2 1.6
--.SGG.Z. 1987-03-14T23:09:42.00 10.0 undecidable manual PN 101 0.0112 -0.41 1.4
--.MSC.Z. 1987-03-14T23:09:38.20 10.0 undecidable manual PG 116 0.0091 -0.87 0.8
--.AQU.Z. 1987-03-14T23:09:34.50 10.0 undecidable manual PG 34 0.0077 -1.47 0.3
--.SD1.Z. 1987-03-14T23:09:34.00 10.0 undecidable manual PG 85 0.0071 -0.82 1
--.RMP.Z. 1987-03-14T23:09:25.50 10.0 undecidable manual SG 347 0.0015 0.38 0.9
--.RMP.Z. 1987-03-14T23:09:22.00 10.0 undecidable manual PG 347 0.0015 -0.31 3.2
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
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