Earthquake with magnitude of Md 2.0 on date 19-05-1987 and time 20:09:40 (UTC) in region 4 km S Rocca Priora (RM)

A magnitude Md 2.0 earthquake occured in region: 4 km S Rocca Priora (RM), on

  • 19-05-1987 20:09:40 (UTC)
  • 19-05-1987 22:09:40 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.76, 12.77 at 6 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
Rocca Priora RM 4 11962 11962
Rocca di Papa RM 5 17034 28996
Nemi RM 6 1943 30939
Monte Compatri RM 6 11978 42917
Lariano RM 6 13432 56349
San Cesareo RM 8 15153 71502
Monte Porzio Catone RM 8 8693 80195
Velletri RM 8 53303 133498
Genzano di Roma RM 8 23970 157468
Colonna RM 9 4287 161755
Ariccia RM 9 19407 181162
Grottaferrata RM 9 20327 201489
Frascati RM 9 22087 223576
Marino RM 9 43026 266602
Albano Laziale RM 10 41715 308317
Castel Gandolfo RM 10 8997 317314
Lanuvio RM 10 13632 330946
Labico RM 10 6379 337325
Zagarolo RM 11 17843 355168
Artena RM 13 14276 369444
Valmontone RM 13 15959 385403
Gallicano nel Lazio RM 14 6334 391737
Palestrina RM 14 21672 413409
Castel San Pietro Romano RM 15 902 414311
Ciampino RM 15 38412 452723
Rocca Massima LT 15 1136 453859
Cave RM 15 11287 465146
Cori LT 18 11065 476211
Poli RM 18 2418 478629
Rocca di Cave RM 18 377 479006
Cisterna di Latina LT 19 36868 515874
Genazzano RM 19 6036 521910
Casape RM 19 744 522654
Capranica Prenestina RM 19 351 523005
San Gregorio da Sassola RM 20 1619 524624

Municipalities with at least 50000 inhabitants

An earthquake occurred to
8 Km N of Velletri (53303 inhabitants)
21 Km NE of Aprilia (73446 inhabitants)
23 Km S of Tivoli (56533 inhabitants)
24 Km E of Pomezia (62966 inhabitants)
27 Km S of Guidonia Montecelio (88673 inhabitants)
28 Km SE of Roma (2864731 inhabitants)
34 Km NW of Latina (125985 inhabitants)
36 Km NE of Anzio (54211 inhabitants)
44 Km E of Fiumicino (78395 inhabitants)
84 Km SW of L'Aquila (69753 inhabitants)
89 Km E of Civitavecchia (52991 inhabitants)
90 Km S of Terni (111501 inhabitants)
92 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 2.0 1987-05-19
20:09:40
41.76 12.77 6 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 47339
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-05-19 20:09:40 ± 0.043
Latitude 41.76 ± 0.00
Longitude 12.77 ± 0.00
Depth (km) 6 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 47339

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) 210.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 218
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
Epicentral distance of station closest to the epicenter (degree) 0.00032
Epicentral distance of station farthest from the epicenter (degree) 0.00154
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 47339
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:46:25
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CP9.Z. 1987-05-19T20:09:47.00 10.0 undecidable manual SG 52 0.0015 0.02 0.4
--.CP9.Z. 1987-05-19T20:09:44.00 10.0 undecidable manual PG 52 0.0015 -0.02 1.1
--.RMP.Z. 1987-05-19T20:09:43.50 10.0 undecidable manual SG 317 0.0006 0.01 0.6
--.RDP.Z. 1987-05-19T20:09:42.50 10.0 undecidable manual SG 271 0.0003 -0.05 0.6
--.RMP.Z. 1987-05-19T20:09:42.00 10.0 undecidable manual PG 317 0.0006 -0.02 1.6
--.RDP.Z. 1987-05-19T20:09:41.50 10.0 undecidable manual PG 271 0.0003 0.03 1.6
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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