  //  (,*+*)
 /  ,,1ῌ,-+   ,/*MN! U½V,*+*  2 2 ,1 5 ,*+*  +* 2 . 5

Report on the conference celebrating for ,/*th anniversary ofVolcán Jorullo’s birth in Michoacán, México
Toshiaki HASENAKA and Izumi YOKOYAMA 6$7+ 8-9*":67-+6#3;#<=*, >?@ABCDE( F GH D( !$+#IJ

.$,K3 LM?N?ABC347O.P-.$ Q$R- S6 0T$/U+,

4(!"347V#64W$X.P,Y%Z(&T$['(.$ \]^_`abcdefc+)*+g,dehi - -0j

kB (Michoacán) l(+%&' (Jorullo)  +1/3 mn$!.-.$ \]^_ ^op34/q r0H  sf@aB (Paricutin)  +3.. H U ti-1 . uvw2(.$ (Fig. +)

 !"#$ %&'()*"+GH 34 .. x(//03!, A. Humboldt 1y(zP"){0|#"#$ ,**3  3 2 ,3 J-45+ }6 ~i?0EK"1 2/ (7+ ,/* 8 (+1/3) / %&' 0K*, ( ^'B9(6o?0:1$ ;,-.$ /!01*" ,**3  3 2 ,1 34

X<+E :+* 2 . - `abckBl.defc (Morelia)

Session + : Geologic and tectonic setting of monogenetic

- \]^_=>G?

volcanism

@:



A B JB CDE

6FGH(,$J+ \]^_ (UNAM)!, I

ῌChichinautzin monogenetic volcano group,ῌClustering at Auckland Volcanic Field,
ῌCinder cones in Guatemala,`abckB IAVCEI -.P, <=X+J#1

ῌCampi Flegrei caldera,,/*  - R(V63P, K%L (;#   F

ῌUdo volcano, Jeju Island,3P,

ῌSize of cinder cones at Tenerife,( \]^_  ¡U*" ;#¢(

F3P, 34+MN!  £O¤ ¥)ῌSeveral papers on Jorullo volcano,¦3 - -.P, <=XFE63P,PU*"

ῌCa. +01* yrs BP Xitle eruption,+ §Q¨©pBª&«B¬­®4\]^

ῌThickness distribution of deposits from Paricutin using a_-.P,n#37R!6# *3* ¯°+ K<=X+pBª&«B¬0KE±($/U6E²@-³, 6´"-+ /uµ(¶6P" )·J.¤ FEST¸\]^_qQ4!63P,P ¹l34+ H.U. Schmincke º» G. Orsi º»¼20*ῌ2///  ,ῌ-3ῌ+  Department of Earth Science, Graduate School ofScience and Technology, Kumamoto University,
Kurokami ,ῌ-3ῌ+, Kumamoto, 20*ῌ2///, Japan.

ground penetrating radar,ῌTemporal evolution of magmatic plumbing systems beneath Jorullo and Paricutin,ῌMorphometrical analysis of eroded scoria cones of theBakony, Hungary,+20ῌ***,  +ῌ+1ῌ1ῌ+.*.
Higashi +ῌ+1ῌ1ῌ+-*. Kunitachi, Tokyo, +20ῌ***,, Japan.
Corresponding author : I. Yokoyama
e-mail : yokoizu@aol.jp

228&'( )* +ῌDescription of Volcán Jorullo by Fray Francisco deAjofrin, +10..
Session . : Environmental, biological, and policy aspects
ῌEruptive products at the Earth’ surface,ῌSoil organic carbon stocks, Chichinautzin,ῌLa Huacana’s land use scenarios.
Session / : Volcanic hazards, risk mitigation, and social
vulnerability
ῌMonitoring and risk evaluation at Colima and Popocatépetl,Fig. +. Location map of Jorullo and Paricutin. M :Mexico City, R : Morelia, U : Uruapan, Dashedrectangle : Michoacán-Guanajuato Volcanic Field,
Dotted ﬁelds : Mexican Volcanic Belt.

ῌAsh-fall hazard at San Martin volcano,ῌEvaluation of lava ﬂow susceptibility at Mt. Etna,
ῌCO,-emission from soils at monogenetic volcanic ﬁelds,
ῌCities on volcanic ﬁelds, Auckland,ῌEruptive style of Chichinautzin monogenetic ﬁeld,

ῌTacámbaro-Puruarán monogenetic volcanic ﬁeld,

ῌMonitoring of El Chichón volcano

ῌUse of digital elevation models to estimate total volume

ῌLarge-scale explosive eruptions, Ruapehu,

of magma of Paricutin,
ῌSector collapse of scoria cones during the AD +1/3

ῌLahar hazard of Colima volcano,ῌMorphometric analysis of cinder cones, Tenerife, andJorullo eruption.

volcanic risks.

Session , : Petrological and geochemical aspects of mono-

Session 0 : The Trans-Mexican Volcanic Belt and sub-genetic volcanism

duction zone volcanism : Diversity of eruptive styles

ῌHydrogeochemistry of volcanic lakes in MichoacanGuanajuato Volcanic Field,
ῌAssimilation coupled to Fractional Crystallization (AFC)at Paricutin,ῌMagma mixing at El Chichon and Popocatépetl,ῌGeochemical variation of monogenetic basaltic ﬁelds : aῌImpact of the Orozco Fracture Zone on the central MVB.
ῌMagma eruption rates of the Trans-Mexican Volcanic
Belt (TMVB),ῌScaling laws for the frequency-size distribution of themonogenetic volcanism, within the TMVB,
ῌA new monogenetic volcanic ﬁeld in the eastern TMVB.

case study from Auckland,ῌOs isotope systematics of Jorullo lavas,
ῌOs isotope evidence for heterogeneous mantle beneath
Chichinautzin,

3  ,2    (Somegeophysical characteristics of monogenetic volcanism : Jorulloand Paricutin) &'( (Coexistence of shield volcanoes

ῌA geochemical perspective of monogenetic volcanism,and small cones from the Michoacan-Guanajuato volcanic

ῌSr-Nd-Pb isotope of Jorullo volcano : crustal contamina-

ﬁeld : their distribution, age, magma output rate, and com-tion versus subduction signatures,
ῌWhat do we know about Jorullo’s basement?

position of magmas),-./01 234. +*  + 56789: (Nature of particle types formed during

Session - : Tying the historic with the geologic record

the violent Strombolian explosive eruption of Jorullo volca-(tephra studies)no)ῌEvolution of the Jorullo group eruption (+1/3῍+11.),;:,-<    !"#$% :ῌPopocatépetl’s .3/* yr BP eruption,

Rowland, S.K., Jurado-Chichay, Z., Ernst, G. and Walker

ῌEvaluating tephrochronology in the Auckland Volcanic

G.P.L. (,**3) Pyroclastic deposits and lava ﬂows from theField,
ῌThe ca. +,./ yr BP Asosoca Tephra, Nejapa-MiraﬂoresFault, Nicaragua,ῌTephro-chronological reconstruction of eruptive historyof Vulcano Island,+1/3῍+11. eruption of El Jorullo, México : aspects of ‘violent Strombolian’ activity and comparison with Parı́cutin.
Studies in Volcanology, Special Publication of IAVCEI, ,+*/῍+,2 =>< I.J$

?@ABCDEFGH

%&'()*+,-.

Fig. ,. Jorullo volcano, an aerial photo viewed fromthe east. Photo taken Dec. +/, ,**2 (from theguide book for the Meeting). The foreground is
the eastern lava ﬂows. Pil : La Pilita cone (volcanic), Pho : The location of a group photo (Fig. -).

,/* / 01 2229

Fig. -. A group photo at the western rim of Jorullocrater. The background is lava ﬁeld at the westernfoot of the volcano. The front center is Prof. C.
Siebe.

3  45   ,** 678
3 @ ,3 )*+,- 4ABC<LA +/* km 9:; <,/*)*+,-MN3 O!A )*+ XGYZ ["AQ

9 IVab&c$Q '-(Mata dePlátano Lbb e'f N#g -/* m)*+-)]A* -+ , -hiA *Rj=RjSAkN3  *) . 8 Q3 Fig. ,N#p)*+,-Mata de Plátano =- >?

DE)*+ BFGHIJKP QR  S TUVW 
#R$3 (Fig. /) % \]LA^_UV`d3+*  ,  '$l

3 @ -*  +* @ +  ^_UVmW nPo

AQ qZr  es!

t'uH / ,   <LA ++* km 012AQ O$x*VXH (Uruapan) y3 < - =)5h67AQ  897`:;<z{* |sZHN# LAXUsH`M:  ,/* 6=>?}$  -)N#~N3     San Juan & <z:A@$R  Fig. 4?

v-)wA :;AA  +.* m B ,Cj!"p k )+* m HgI .J  +3.0  UNAM *+,-N0  USGSO3j

USGS Bull.

Plate 1 VW$

30/ (+3/*)+2*-  3 @ A. von Humboldt

1DA 4 E FG O ? San Juan& yKL  ,* km 'Nuevo San Juan M$ $P 1QR S TU#$XUsH,- <z Xkp0M$ )* +*  -   8 ,* kmAngahuan+,- <z:. $YAQj &]ALA ON#ZA<zR XUs L. von Buch

H (R ON#[\A-)C +2+3  Crater of Eleva-tion  !"#$   #3
BonplandO¢£¤¥"

Q `a A.

 (Humboldtand Bonpland, +2+*, Vues des Cordilleres)◊  ]£l jQR m ¬j - N3 Bonpland ! Hornito)o®¯ s °XPo  (oHFig. . (a) ¶

·45±
Fig. . (b) AQ ´µ qZres!  ¹wN# Fig. . (a)p -z {|}~ :¼8] Q3 ^Z _ 0; ¡ :bc$!BAQ3 O d efg¦1§$ ++ h S¨N# Si-jTUV© #1AQ3 O kA 01 ª«O0­no< pq$ ^_UVrRt R²u #$ O³? ´µ )*+,-*3³v ¸-jpq$ ( )º x01 Q »y , })*+,- N0] ½$



230



Fig. /. Gran mariache ﬁesta on Sep. ,3, ,**3 at Matade Plátano, south-eastern foot of Jorullo.

+),.,, BP ,/* Xitle, Mexico City :  Libby(+3/,)   +* km !  1, km, "# $%&'( Martin DelPozzo )*+!,-,)+**,, +**1+**2

 (Jeju Is.) :  -/* .

/01 )23 45611 7)809
:;<2-) =)61!>?@AB C1DEFG (,***) HI,- $%&'( Brenna  (New Zealand) )JK
2- Udo 1 H,L&MNO"PQ!,--)+/-2 Monte Nuovo Campi Flegrei   Italy : - R( *.*/ km-  Pyroclastic density currents "ST! $%&'( 4UVH, Di Vito (Italy) )WX!,-.)+1+3  +1,+  : YZ[\] --* km ^_!  .* km  ,/ km ` +. ./01
Fig. .. Hornitos as described by Humboldt vs. thoseobserved in the ﬁeld (from the guide book). a)
Lithography of Jorullo and hornitos in Vues desCordilleres◊ (Humboldt and Bonpland, +2+*). b)
The main cone of Jorullo seen from the west with
two typical, - to . m high hornitos in the foreground. CP : Cerro Partido, a pre-existing ridge
surrounded by Jorullo’s lava ﬂows. Photo taken
June ,*, ,**1 (from the guide book for theMeeting).

7)2- 4561ab  1c )809
6Tdef +.+ km- DRE g!/)+1/3+100 Jorullo : 6Tdef , km- DRE $% h Siebe GZij (UNAM) -kINO0l)PQ9 m Schmincke, nopPM616Tdqrsl> 61tu"+v
0)+3.-+3/, Paricutin : 6Tdef +.3 km- DRE:wx9,- y?@m(kINO)PQ9,- $%&'( hz{|}\"~:!
+PQ>1)5/01+3.-+3.. Waiowa (Goropu Mountains, Papua) : PortMoresby K ,+* km ^_- +3.-  +,  ,1 RkII", 1  ) ../ km 9Jorullo : Paricutin 5:! IUm()  61M +3.. V);<9,- m(  ¡-2  -+ R Port Moresby ¢);<9 (Baker,£3+3.0)

5/01 ¤0H, ¥&'(WX¦§!¨©ª-2)+3-*+323!"#$% : 4 +3-* ,/*  !"# +323 $%&'(!")*+,-. /-#0123)456&78 '9:&;<=>?8 @ A  & B#C. DE F#G-3

/-, H,9:&I>J8K !

"(9:>&?8__C.`5#C. abc)kl mn#& o.pq
r#& !"s k78_KtuC.ῌ῏῎῍(vN> Jorullo wx Paricutin yzK{1-3K /-&K|>>C.
/)}*+.) ~Y>)2l7# >#C23)5 DE3> Guilbaud
 (,**3) Kk3\&38/)>8l`-l8l  >¡¢.)/£K¤8)1-./}¥¦)kl C. Siebe §¨ (UNAM) ©
ª_) «8hi ¬­Kt8 KF®

¯hi}°l8./)K±²>³23 Prof.
C. Siebe }&´µ¶·>J¸7¹} ¢._#C. 7º Paricutin _»  #C.
K /#& ,/* >¼. Jorullo >»½}º8lk3ῐ ΐ ῒ ῑBaker, G. (+3.0) Preliminary note on volcanic eruption in
the Goropu Mountains, southeastern Papua, during the231

period December, +3.-, to August, +3... J. Geology, /.,+3ῌ-+.
Guilbaud, M.N., Siebe, C and Salinas, S. (,**3) Excursions
to Paricutin and Jorullo (Michoacán), the youngest
volcanoes of the Trans-Mixican Volcanic Belt. pp. -+.
LMN O    P  MQRS     T UVWR (,***) XY Z[ \]^d efgfhi a , j .+ῌ1..
Libby, W.F. (+3/,) Radiocarbon dating. The Univ. Chicago Press. Determ. No. ,**, pp. 3+.