Earthquake with magnitude of Md 2.2 on date 11-05-1987 and time 15:12:11 (UTC) in region 2 km W Velletri (RM)

A magnitude Md 2.2 earthquake occured in region: 2 km W Velletri (RM), on

  • 11-05-1987 15:12:11 (UTC)
  • 11-05-1987 17:12:11 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.6930, 12.7610 at 9 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 2 53303 53303
Nemi RM 5 1943 55246
Lanuvio RM 5 13632 68878
Genzano di Roma RM 6 23970 92848
Lariano RM 7 13432 106280
Ariccia RM 8 19407 125687
Rocca di Papa RM 9 17034 142721
Albano Laziale RM 9 41715 184436
Castel Gandolfo RM 11 8997 193433
Rocca Priora RM 11 11962 205395
Marino RM 12 43026 248421
Cisterna di Latina LT 12 36868 285289
Monte Compatri RM 13 11978 297267
Grottaferrata RM 13 20327 317594
Rocca Massima LT 13 1136 318730
Cori LT 14 11065 329795
Artena RM 14 14276 344071
Monte Porzio Catone RM 14 8693 352764
Frascati RM 14 22087 374851
Aprilia LT 14 73446 448297
San Cesareo RM 15 15153 463450
Labico RM 15 6379 469829
Colonna RM 16 4287 474116
Valmontone RM 16 15959 490075
Zagarolo RM 17 17843 507918
Ciampino RM 18 38412 546330
Palestrina RM 20 21672 568002
Cave RM 20 11287 579289

Municipalities with at least 50000 inhabitants

An earthquake occurred to
2 Km W of Velletri (53303 inhabitants)
14 Km NE of Aprilia (73446 inhabitants)
22 Km E of Pomezia (62966 inhabitants)
28 Km NW of Latina (125985 inhabitants)
29 Km NE of Anzio (54211 inhabitants)
30 Km S of Tivoli (56533 inhabitants)
32 Km SE of Roma (2864731 inhabitants)
34 Km S of Guidonia Montecelio (88673 inhabitants)
44 Km E of Fiumicino (78395 inhabitants)
90 Km SW of L'Aquila (69753 inhabitants)
92 Km E of Civitavecchia (52991 inhabitants)
97 Km S of Terni (111501 inhabitants)
97 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 2.2 1987-05-11
15:12:11
41.693 12.761 9 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 46829
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-05-11 15:12:11 ± 0.522
Latitude 41.6930 ± 0.0249
Longitude 12.7610 ± 0.0187
Depth (km) 9 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 46829

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) 3176.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 293
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00065
Epicentral distance of station farthest from the epicenter (degree) 0.00623
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information

Md:2.2

Field Value
Value 2.2
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 46829
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:45:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.MNS.Z. 1987-05-11T15:12:35.00 10.0 undecidable manual SG 355 0.6882 -0.37 0.3
--.MNS.Z. 1987-05-11T15:12:25.50 10.0 undecidable manual PG 355 0.6882 0.42 0.7
--.CP9.Z. 1987-05-11T15:12:20.50 10.0 undecidable manual SG 40 0.2109 0.4 0.5
--.RDP.Z. 1987-05-11T15:12:16.00 10.0 undecidable manual SG 333 0.0666 0.73 0.1
--.RMP.Z. 1987-05-11T15:12:16.50 10.0 undecidable manual SG 339 0.1221 -0.32 0.7
--.CP9.Z. 1987-05-11T15:12:16.00 10.0 undecidable manual PG 40 0.2109 -0.27 1.8
--.RMP.Z. 1987-05-11T15:12:14.00 10.0 undecidable manual PG 339 0.1221 -0.37 1.4
--.RDP.Z. 1987-05-11T15:12:13.50 10.0 undecidable manual PG 333 0.0666 0.03 2.4
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download