Earthquake with magnitude of Md 2.0 on date 05-06-1987 and time 05:25:41 (Italy) in region 6 km S Velletri (RM)

A magnitude Md 2.0 earthquake occured in region: 6 km S Velletri (RM), on

  • 05-06-1987 03:25:41 (UTC)
  • 05-06-1987 05:25:41 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.64, 12.77 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 6 53303 53303
Cisterna di Latina LT 7 36868 90171
Lanuvio RM 7 13632 103803
Genzano di Roma RM 10 23970 127773
Nemi RM 11 1943 129716
Aprilia LT 11 73446 203162
Lariano RM 12 13432 216594
Cori LT 12 11065 227659
Ariccia RM 13 19407 247066
Rocca Massima LT 13 1136 248202
Albano Laziale RM 14 41715 289917
Rocca di Papa RM 15 17034 306951
Castel Gandolfo RM 16 8997 315948
Artena RM 17 14276 330224
Marino RM 18 43026 373250
Rocca Priora RM 18 11962 385212
Norma LT 18 3946 389158
Ardea RM 19 49183 438341
Grottaferrata RM 19 20327 458668
Labico RM 19 6379 465047
Monte Compatri RM 19 11978 477025

Municipalities with at least 50000 inhabitants

An earthquake occurred to
6 Km S of Velletri (53303 inhabitants)
11 Km E of Aprilia (73446 inhabitants)
22 Km NW of Latina (125985 inhabitants)
23 Km E of Pomezia (62966 inhabitants)
24 Km NE of Anzio (54211 inhabitants)
37 Km S of Tivoli (56533 inhabitants)
37 Km SE of Roma (2864731 inhabitants)
41 Km S of Guidonia Montecelio (88673 inhabitants)
47 Km E of Fiumicino (78395 inhabitants)
95 Km SW of L'Aquila (69753 inhabitants)
96 Km SE of Civitavecchia (52991 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
Rev 1000 Md 2.0 1987-06-05
03:25:41
41.64 12.77 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 48659
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-06-05 03:25:41 ± 0.253
Latitude 41.64 ± 0.01
Longitude 12.77 ± 0.01
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 48659

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) 1369.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 310
Number of associated phases, regardless of their use for origin computation 6
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.00113
Epicentral distance of station farthest from the epicenter (degree) 0.00235
Number of stations at which the event was observed 3
Number of stations from which data was used for origin computation 3
Magnitude information

Md:2

Field Value
Value 2
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 48659
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:47:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CP9.Z. 1987-06-05T03:25:52.00 10.0 undecidable manual SG 30 0.0023 0.09 0.6
--.RMP.Z. 1987-06-05T03:25:49.00 10.0 undecidable manual SG 343 0.0016 0.15 0.4
--.CP9.Z. 1987-06-05T03:25:47.50 10.0 undecidable manual PG 30 0.0023 -0.06 1.6
--.RDP.Z. 1987-06-05T03:25:46.60 10.0 undecidable manual SG 341 0.0011 -0.27 0.4
--.RMP.Z. 1987-06-05T03:25:46.00 10.0 undecidable manual PG 343 0.0016 0.2 1.1
--.RDP.Z. 1987-06-05T03:25:44.60 10.0 undecidable manual PG 341 0.0011 -0.06 2
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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