Earthquake with magnitude of Md 2.3 on date 04-05-1987 and time 20:36:07 (UTC) in region 1 km S Lariano (RM)

A magnitude Md 2.3 earthquake occured in region: 1 km S Lariano (RM), on

  • 04-05-1987 20:36:07 (UTC)
  • 04-05-1987 22:36:07 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.7240, 12.8350 at 10 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
Lariano RM 1 13432 13432
Velletri RM 6 53303 66735
Artena RM 7 14276 81011
Labico RM 8 6379 87390
Rocca Massima LT 9 1136 88526
Valmontone RM 9 15959 104485
Nemi RM 10 1943 106428
Rocca Priora RM 10 11962 118390
Cori LT 11 11065 129455
San Cesareo RM 11 15153 144608
Rocca di Papa RM 11 17034 161642
Lanuvio RM 12 13632 175274
Genzano di Roma RM 12 23970 199244
Monte Compatri RM 12 11978 211222
Zagarolo RM 13 17843 229065
Cave RM 13 11287 240352
Ariccia RM 14 19407 259759
Palestrina RM 14 21672 281431
Colonna RM 14 4287 285718
Monte Porzio Catone RM 14 8693 294411
Colleferro RM 14 21595 316006
Cisterna di Latina LT 15 36868 352874
Castel San Pietro Romano RM 15 902 353776
Albano Laziale RM 15 41715 395491
Marino RM 16 43026 438517
Castel Gandolfo RM 16 8997 447514
Grottaferrata RM 16 20327 467841
Frascati RM 16 22087 489928
Segni RM 16 9159 499087
Gallicano nel Lazio RM 16 6334 505421
Rocca di Cave RM 17 377 505798
Genazzano RM 17 6036 511834
Gavignano RM 18 1916 513750
Capranica Prenestina RM 18 351 514101
Poli RM 19 2418 516519
Montelanico RM 19 2131 518650
Norma LT 19 3946 522596

Municipalities with at least 50000 inhabitants

An earthquake occurred to
6 Km NE of Velletri (53303 inhabitants)
21 Km NE of Aprilia (73446 inhabitants)
27 Km S of Tivoli (56533 inhabitants)
28 Km E of Pomezia (62966 inhabitants)
29 Km N of Latina (125985 inhabitants)
32 Km S of Guidonia Montecelio (88673 inhabitants)
35 Km SE of Roma (2864731 inhabitants)
35 Km NE of Anzio (54211 inhabitants)
50 Km E of Fiumicino (78395 inhabitants)
84 Km SW of L'Aquila (69753 inhabitants)
94 Km S of Terni (111501 inhabitants)
95 Km E of Civitavecchia (52991 inhabitants)
98 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 2.3 1987-05-04
20:36:07
41.724 12.835 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 46339
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-05-04 20:36:07 ± 0.351
Latitude 41.7240 ± 0.0331
Longitude 12.8350 ± 0.0220
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 46339

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) 4105.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 200
Number of associated phases, regardless of their use for origin computation 7
Number of defining phases 7
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) 0.00081
Epicentral distance of station farthest from the epicenter (degree) 0.00648
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:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 46339
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:45:32
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.SDI.Z. 1987-05-04T20:36:33.50 10.0 undecidable manual SG 90 0.7215 0.66 0.1
--.SDI.Z. 1987-05-04T20:36:22.00 10.0 undecidable manual PG 90 0.7215 -0.16 1.4
--.MNS.Z. 1987-05-04T20:36:21.00 10.0 undecidable manual PG 350 0.666 -0.11 1.5
--.RMP.Z. 1987-05-04T20:36:14.00 10.0 undecidable manual SG 311 0.1221 0.27 0.7
--.RDP.Z. 1987-05-04T20:36:13.50 10.0 undecidable manual SG 291 0.0888 0.88 0.1
--.RMP.Z. 1987-05-04T20:36:11.00 10.0 undecidable manual PG 311 0.1221 -0.13 2.1
--.RDP.Z. 1987-05-04T20:36:10.00 10.0 undecidable manual PG 291 0.0888 -0.48 1
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