Earthquake with magnitude of Md 2.0 on date 20-05-1987 and time 07:13:28 (Italy) in region 2 km E Nemi (RM)

A magnitude Md 2.0 earthquake occured in region: 2 km E Nemi (RM), on

  • 20-05-1987 05:13:28 (UTC)
  • 20-05-1987 07:13:28 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.72, 12.74 at 12 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
Nemi RM 2 1943 1943
Genzano di Roma RM 4 23970 25913
Rocca di Papa RM 5 17034 42947
Velletri RM 5 53303 96250
Ariccia RM 6 19407 115657
Lanuvio RM 6 13632 129289
Albano Laziale RM 7 41715 171004
Castel Gandolfo RM 8 8997 180001
Lariano RM 8 13432 193433
Rocca Priora RM 8 11962 205395
Marino RM 8 43026 248421
Grottaferrata RM 9 20327 268748
Monte Compatri RM 10 11978 280726
Frascati RM 10 22087 302813
Monte Porzio Catone RM 10 8693 311506
San Cesareo RM 12 15153 326659
Colonna RM 12 4287 330946
Labico RM 14 6379 337325
Ciampino RM 14 38412 375737
Artena RM 15 14276 390013
Zagarolo RM 15 17843 407856
Rocca Massima LT 16 1136 408992
Valmontone RM 16 15959 424951
Aprilia LT 16 73446 498397
Cisterna di Latina LT 16 36868 535265
Cori LT 17 11065 546330
Gallicano nel Lazio RM 18 6334 552664
Palestrina RM 18 21672 574336
Castel San Pietro Romano RM 19 902 575238
Cave RM 19 11287 586525

Municipalities with at least 50000 inhabitants

An earthquake occurred to
5 Km NW of Velletri (53303 inhabitants)
16 Km NE of Aprilia (73446 inhabitants)
21 Km E of Pomezia (62966 inhabitants)
27 Km S of Tivoli (56533 inhabitants)
28 Km SE of Roma (2864731 inhabitants)
31 Km S of Guidonia Montecelio (88673 inhabitants)
32 Km NW of Latina (125985 inhabitants)
32 Km N of Anzio (54211 inhabitants)
42 Km E of Fiumicino (78395 inhabitants)
88 Km E of Civitavecchia (52991 inhabitants)
89 Km SW of L'Aquila (69753 inhabitants)
93 Km SE of Viterbo (67173 inhabitants)
94 Km S of Terni (111501 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 1987-05-20
05:13:28
41.72 12.74 12 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 47409
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-05-20 05:13:28 ± 0.429
Latitude 41.72 ± 0.02
Longitude 12.74 ± 0.03
Depth (km) 12 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 47409

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) 3419.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 284
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00032
Epicentral distance of station farthest from the epicenter (degree) 0.00186
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 47409
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:46:28
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CP9.Z. 1987-05-20T05:13:37.00 10.0 undecidable manual SG 49 0.0019 0.2 0.3
--.CP9.Z. 1987-05-20T05:13:33.00 10.0 undecidable manual PG 49 0.0019 -0.12 0.9
--.RMP.Z. 1987-05-20T05:13:33.00 10.0 undecidable manual SG 342 0.0008 -0.34 0.4
--.RDP.Z. 1987-05-20T05:13:32.50 10.0 undecidable manual SG 333 0.0003 0.16 0.4
--.RMP.Z. 1987-05-20T05:13:31.50 10.0 undecidable manual PG 342 0.0008 0.38 0.6
--.RDP.Z. 1987-05-20T05:13:30.50 10.0 undecidable manual PG 333 0.0003 -0.04 3.4
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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